By now you are probably well aware of the NetLink's monitoring abilities and the added monitoring and control provided when an M8 board is used in conjunction with the NL4. But did you know that both the NL2 and NL4 have two control outputs which can be used to control external relays or other devices?
The control outputs can be used when basic control is needed without the full ISCAN functionality. Our latest application note AN25 goes in-depth on using these control outputs to control individual devices or groups of devices, as well as other uses. It can be found here:
Many times an existing wire run is undersized for the current draw of the load device. This could either be due to an unexpected change in the device being powered, a miscalculation at the planning stage of the job, or a retrofit situation where the existing wire size is not able to be changed. This undersized wire results in a large voltage drop, leading to improper or erratic operation of the load device. Even if the voltage at the device is at the low end of the acceptable range, the voltage will quickly drop to unacceptable levels when on battery power.
Wire has a specific resistance per foot of length. The smaller the wire gauge, the higher the resistance (given equivalent wire types). As the length of the wire increases, the total resistance between the power source and the load device increases. When current is now drawn through this wire resistance, some of the voltage is "burned off" in the wiring as voltage drop, as defined by Ohm's Law (V=IxR).
Per Ohm's Law, two main factors affect the amount of voltage dropped within the wire run: the wire resistance, and the current drawn through the wire. This is why a lower-current device can get away with a smaller wire gauge.
This is also one of the main reasons the lifesafety industry has, and continues to, switch from 12V to 24V. A given device will use a certain number of Watts. If that device is designed to use a 24V input rather than 12V, the current required will be halved (per Ohm's Law I=P/E), which in turn will halve the voltage drop.
If powering a 12V device, a B100 can be used to give an adjustable output voltage greater than the 12.5V nominal setting of an FPO power supply. The FPO will need to be set for a 24V output, and the B100 placed into the adjustable range by moving JP3 to position 2. The output can then be set by adjusting VR2 to a level giving an acceptable voltage at the load device. Since this voltage is run off of a 24V supply with a 24V battery set, this voltage will remain constant until the battery set drains to well below 20V.
Please note that if the device being powered has varying current levels during normal operation, the voltage at the device will change with this current, possibly with damaging results. As an example:
A B100 is set to a level of 16.5V to overcome the voltage drop through 500 feet of 18AWG wire powering a 12V edge device and a 12V maglock at a door. The draw of the lock is 400mA and the edge device is 100mA, giving a total draw of .5A when the lock is powered. When the lock is powered, the voltage drop will be 3.24V, leaving 13.26V at the door. However, when the lock is released, and the current draw drops to 100mA, the voltage drop will decrease to 0.65V, giving 15.85V at the door, which is likely too high for the 12V edge device.
In the above example you could decrease the B100 voltage to compensate, but you must take the whole operating current range into account. If the operating current range is too large, there may not be an acceptable voltage to cover all load conditions.
In previous parts of this series, we have covered the basics, inputs, outputs, and jumper configuration of the C8 board. If you missed any of these parts, you can find them here:
In this, the final part of the series, we will explain the usage of our Excel Jumper Configuration Tool.
About the Tool
The tool uses information entered by the user to determine the correct jumper settings. Even if you have the jumper settings memorized, the tool is very helpful in quickly configuring multiple zones. Jumper settings can be predetermined in the office, printed, and included in the system design documentation, or done on-the-fly at the job site.
Using the Tool
To begin, open the file in Excel. There are three sections on the screen - Voltage Sources, Zone Information, and Results.
Step 1 - Voltage Sources
The Voltage Sources section is where you enter the B1 and B2 voltages used as the power source for the C8. In a single voltage system, only the B1 field will have information entered. The B2 field should be left blank.
A dual voltage system should have both the B1 and B2 fields filled in as appropriate. Remember that a dual FPO system (as built by LifeSafety Power) would have the top FPO's voltage in the B1 space and the bottom FPO's voltage in the B2 space. An FPO/B100 system would have the FPO's voltage as B1 and the B100's voltage as B2.
Entering this information correctly is important for the yellow jumper's setting. Reversing this data will cause the incorrect output voltage to be placed on the outputs, potentially damaging the powered equipment. Remember to always double check your output voltages before connecting any load devices.
The B1/B2 information will remain consistent across all boards and zones in a typical FPO power supply system.
In this example, the B1 supply is set for 24V and the B2 supply is set for 12V.
Step 2 - Zone Information
The Zone Information section is where you enter the information for the zone being configured. This information may vary zone to zone.
In this example, the input is set for a NO Dry Contact and the output is set for a 24V maglock with FAI.
Step 3 - Results
The results section displays the correct jumper settings for the configuration entered in steps 1 and 2. Jumpers A-F are shown with a visual representation of positions 1 and 2 for each jumper. Remember to look closely at the C8 PC Board for positions 1 and 2 for each jumper carefully, as these positions change from jumper to jumper.
Visit 3515 to find out more!!
Now in its impressive 61st year, ASIS Seminar & Exhibits runs September 28 through 30 in Anaheim Calif. The ‘new age’ of power will be there, showcased at LifeSafety Power® booth 3515.
The new and expanded line of FlexPower® Unified Power Solutions will be highlighted during the show. This innovative enclosure family integrates the industry’s most widely used access controller board power solutions, including Mercury, AMAG Technology and Software House. Unified Power Solutions take up a much smaller footprint while providing new installation opportunities for integrators. And that means costs savings and many other efficiencies for the end-user customer.
There’s even bigger news to share: we’re ready to unveil to the industry the first Mercury Security and LifeSafety Power UL-Listed system. We partnered with Mercury Security to bring to the systems integration and end-user communities one of the first UL-Listed enclosures that includes system power, lock power and remote power options in both rack mount and wall mount configurations. The breakthrough is in the UL listing garnered for the complete range of integrated components within the solution. The two specific products include the FlexPower Gemini RGM series, a rack mount product, and MCLASS Unified Power system, both with Authentic Mercury access control hardware in one compact, secure design.
The Gemini RGM rack mount enclosure is configured to save space and provide installation efficiencies. MCLASS also simplifies wiring and labor, saving the expense of mounting and wiring separate enclosures and AC drops for lock power, while reducing wall space with a smaller enclosure footprint.
More new products
Also at the show, check out the new IP Saver™ a custom appliance product family that utilizes a single LAN IP address to service up to 20 NetLink® communication module drops. NetLink is the industry’s only patented network power management system.
Finally, we’ll have a sneak peek and literature on more new developments – the 16-door Mercury E8V1 and the 16-door HID VertX E8V – ready to meet access control specifications of every size.
The product development wheels never stop turning at LifeSafety Power and we’re proud to show you some of the results of our innovative design and engineering at ASIS. Stop by to see why LifeSafety Power is the leader in Smarter Power Solutions and remote monitoring capabilities with modular power systems that continue to meet the growing needs of the life safety and security industries.
In the previous two parts of this series, we covered the very basics and the inputs of the C8 board. If you missed these parts, you can find them here:
This week we will go in-depth on the outputs of the C8, including the wiring, operation, and jumper configuration.
The Anatomy of the C8 Output
Like the inputs, each output of the C8 has two terminals, labeled A and B. Each output may be individually configured for a voltage output or a relay output and contains a reverse diode to dissipate and reverse EMF from a locking device or other inductive load. See our White Paper and Application note on reverse EMF for more information.
When configured as a voltage output, the B terminal is the positive and the A terminal is the DC Common (ground).
C8 Voltage Output
When configured as a relay output, due to the reverse diode, the current must be fed through the contact in the proper direction. Regardless of what the relay output is activating, there will be a current present. If the relay output of the C8 is connected backwards, the reverse diode will always be conducting and will not change with the relay.
C8 Relay Output
Each output has four configuration jumpers, detailed below.
Black Jumpers (C and E)
The black jumpers for each zone, labeled C and E, configure the output for either a voltage output or a relay output. BOTH jumpers must always be set in the same position (by the jumpers' markings) for proper operation. Check the position markings carefully on the PC board, as position 1 and 2 for each of the black jumpers is different.
By setting the black jumpers in position 1, the output will be configured for a relay output. By setting these jumpers to position 2, the output will be configured as a voltage output.
White Jumper (F)
The white jumper selects between the NO and NC of the output relay. When set for a relay output, this selects a NO or NC output. When set for a voltage output, this selects whether the output is normally powered or not powered (maglock or doorstrike).
By setting the white jumper in position 1, the output will be NO or will normally have no voltage on the output until the input is activated (flashing green LED). This is the typical setting for a fail-secure door strike or electrified handleset.
By setting the white jumper in position 2, the output will be NC or will normally have voltage present on the output until the input is activated. This is the typical setting for a fail-safe maglock.
Again, there is no need to memorize all of the settings - once the blue jumper for the input is set properly (steady when locked, flashing when unlocked - see Part 2), the white jumper can be changed until the output operates correctly.
Yellow Jumper (D)
The yellow jumper selects between the buss 1 and buss 2 voltage supplied to the C8 for each output (See Part 1). If only a single voltage source is connected to the C8, then this jumper should remain in position 1. If two power sources are connected to the C8, then setting this jumper in position 1 will select the voltage source connected to B1 and position 2 will select the B2 power source.
Note that this jumper has no effect when the output is set as a relay output.
The most common output configuration for a C8 is a voltage output. When connecting a device to the terminals when set as a voltage output, the positive connection goes to the B terminal and the negative connection goes to the A terminal.
C8 Voltage Output Wiring
When configured as a relay output, the current through the relay must flow from the B terminal to the A terminal (the more positive side of the voltage on the B terminal). Note that ONLY a DC voltage may be switched through the C8 relay due to the reverse polarity diode.
C8 Relay Output Wiring
LifeSafety Power's FlexPower line of power systems is the industry's first and only fully-modular, listed power supply system. This allows you to choose from a variety of power supplies and output boards and combine them in the best combination for the job at hand. One of the most versatile components at your disposal is the C4 or C8 lock control board. Don't let the "lock control" fool you, however - the C4 and C8 can do far more than just locks.
The C4 and C8 come in four different variations. The C4 and C8 provide 4 and 8 zones, respectively, of 3A fused outputs. The C4P and C8P provide the same 4 and 8 zone counts but use 2.5A PTCs, rather than fuses, to provide Class 2 Power Limiting. In this multi-part series of posts, we will refer mostly to the C8 board, but the C8P, C4, and C4P are all identical in operation.
What does the C8 do?
The C8 board provides eight outputs, each with its own input for control. If you are familiar with the Altronix ACM8, then you are already familiar with this basic concept. The inputs of the C8 are low current, protecting your high-cost access control panel's relays from the high currents and return EMF spikes from the locks. Each output can be individually selected for voltage, lock type, input type, and whether or not to unlock the door on a Fire Alarm Input (FAI) activation. Outputs can be wet or dry (NO or NC).
Input Power & FlexIO Connections
Like all FlexPower output boards, the C8 has a dual-buss power input, allowing use in either single or dual voltage power supplies. When used in a dual voltage power supply, the C8 allows you to select either voltage on each individual output. Note that the C8 MUST be supplied with constant power for proper operation. Do not use the DC2 output of the FPO power supply to power the C8 board - the C8 controls each output for FAI on its own.
The first power supply should be connected to the B1 input of the C8. As with all FlexPower output boards, the power connections can be made at either B1 terminal. The BR connection serves as the DC common and must be connected to the BR terminal of the power supply.
If a second power supply is also being used, it should be connected to the B2 input of the C8. The second power supply's BR terminal must also be connected to the other BR terminal of the C8 so that everything is common grounded together.
The FlexIO connectors supply FAI input and fault status to and from the C8 board. Both FlexIO connectors are the same and either may be used interchangeably. Simply plug one end of the white 2-pin FlexIO cable into the FPO power supply's FlexIO connector and the other end into the C8.
If there are other output boards already connected to the power supply, the C8 may be connected at the end of the chain, or inserted into the middle of the chain. Make sure to match up the wire colors and B1/B2 connections to the other boards in the system.
The C4 and C8 boards have a green LED for every output indicating its status. When the C8 is properly configured, a steady green LED indicates that the door is locked, and a flashing green indicates unlocked. Notice we are speaking in terms of "locked" and "unlocked" rather than about the outputs being powered and unpowered. This makes understanding and configuring the C8 easier, once you are accustomed to thinking this way - all LEDs function the same, whether the input is NO or NC, whether the output is connected to a maglock or door strike, whether FAI is active or not.
If any of the green LEDs are out, it indicates that there is a problem with the fuse (or PTC), jumper settings, or there is a missing power supply voltage.
The C4 and C8 also have a single yellow fault LED. It will light whenever any of the green LEDs are out (blown fuse, incorrect jumper setting, or missing power supply voltage). If there is a fault on your FPO power supply and the C8 also indicates a fault, correcting the C8 fault will likely clear the FPO fault unless multiple problems exist in the system.
Are you in a region that requires egress doors to unlock on an AC loss? Typically, this is accomplished by simply not placing a backup battery set on your 24V lock power supply and using fail-safe locks.
But what if you have other locks or 24V devices you want to remain powered during an AC loss? What if you are using fail-secure locks that need to unlock on a loss of AC power? LifeSafety Power has a more elegant solution that offers more flexibility.
By simply integrating the AC fault relay into the FAI input circuit of the FPO power supply, you now have full control over what happens during an AC power failure using standard FAI-capable outputs. This includes selecting which doors unlock and which don't for both fail-safe and fail-secure locks. It also allows you to select outputs to remain powered during an AC loss.
Earth Ground Fault Detection was developed for the Fire Alarm industry to give enhanced fault detection on NAC loops. Although Earth Ground Fault Detection is not currently required in access control applications, it can still be a useful feature - provided your system is compatible.
Despite what its name might imply, Earth Ground Fault Detection does not detect a missing earth ground connection to your power supply. Instead, it detects a connection between earth ground and any positive or negative output circuit in the system. This includes any part of the system that is common grounded with the power supply. If the power supply with earth ground detection is powering an access control panel, any earth ground faults on the access panel circuits (readers, etc) will show on the power supply. If your access control panel is then common grounded with your 24VDC CCTV system's DVR, any faults on the CCTV system would also show on your power supply. Because of this, it is important to be aware of what is connected to your system - especially when troubleshooting.
An earth ground fault does not mean you necessarily have an immediate problem. It is simply a warning that one leg of a circuit somewhere is either partially or fully shorted to earth ground. Usually, a single short to earth ground causes no problem in the operation of the system. However, a second short to earth ground - even on a completely unrelated circuit, can cause a direct short circuit, leading to blown fuses, erratic operation, or even a fire.
Earth Ground Fault Detection should only be enabled on one piece of equipment within the system. In access control, this is usually the power supply. If the access system is common grounded with the fire system, the FACP may already have earth ground detection enabled. Also, if there are multiple power supplies connected to the access system, only one of these supplies should have Earth Ground Fault Detection enabled - this includes two supplies within the same enclosure.
In many access control applications, even if you follow all of the rules and none of your wiring or load devices is shorted to earth ground, you may still show an Earth Ground Fault. This is usually caused by access control panels that don't "play nice" with earth ground fault detection. As stated above, Earth Ground Fault Detection is not a requirement in access control. Many access panels require shielded communications circuits and the panel manufacturers connect these shields to earth ground and DC ground for better shielding or other RF noise or transient requirements. In these cases, the only option is to disable the Earth Ground Fault Detection entirely.
For more information, our application note AN-32 (Troubleshooting Earth Ground Faults) goes in-depth on how earth ground fault detection works and the best method of troubleshooting earth ground fault conditions. And as always, our Technical Support Department is always here to help.
LifeSafety Power provides modular, smarter power solutions.You can pick and choose among our myriad possible model number combinations – which provides the ultimate flexibility for all your customers and their systems. This way, you can custom design just the right product output, enclosures or other particulars that match the job or the specification. What a great value-add for you the integrator and a way to differentiate your solutions in the field.
The FlexPower® power management systems include several standard features, but you build it from there. This modularity allows for many custom configurations: from simple, single or dual voltage power distribution to more sophisticated solutions with three or more voltages or a combination of AC and DC power and more.
LifeSafety Power’s solutions are leaders in world-class innovation: our network-connected devices give you and your user remote connectivity and control so you’re always on top of power operation status – even across a large enterprise infrastructure with multiple, disparate buildings.
The modularity and capabilities of our products means you can’t always find a particular model or datasheet on our website – that’s because we leave it to you to match the specification of your job to the capabilities of our products. Your customer gets what they need to satisfy all their power needs.
LifeSafety Power’s award-winning solutions are based on exclusive, patented technologies for the most intelligent and reliable power delivered to security, access control, fire systems, mass notification and CCTV.
For network-managed, expandable and redundant power solutions, always turn to LifeSafety Power. For additional help, we have technical training videos, downloads and our latest, 2015 catalog online now. Remember, these are standard configurations from which you can build on to create just the right smarter power solution. Technical support is always ready to assist!