EST3 Installation and Service Manual

Access control applications

Power from a remote source

Description of the application

By remote power, we mean that the CRC provides the power to operate the electronic door strike or maglock by using a remote

DC power supply. This additional power can provide continuous power to the door strike or maglock.

A typical CRC using remote power is shown in Figure 3-16. The additional power is needed because the CRC battery can not keep up with the power needs of maglocks or strikes with an active duty cycle greater than 30 seconds in a minute. In these conditions the battery does not have enough time to charge and keep up with the drain.

The figure shows power coming from the additional remote power supply to power the CRC and maglock. The supply is supervised by the Signature data circuit derived from the 3-

SSDC(1) module. The 3-SAC connects to the CRC through the

SAC bus.

3.42 EST3 Installation and Service Manual

Access control applications

Control panel

3-PPS/M

3-SAC

Signature

Controller

SAC bus

+24 Vdc bypasses CRC

Remote power supply

24 Vdc

CRC

Passive infrared detector

Card reader

Maglock or strike

SIGA loop monitors remote power supply

Request to exit button

X

X

X

Other factors

Power supply

Hardware configuration

SDU programming

ACDB/KDC operation

Figure 3-16: CRC using remote power

The negative side of the 3-PPS/M power supply coming from the control panel connects to the CRC (and to all other CRCs). The positive side is broken and the remote power supply picks up the load. This wiring is shown in Figure 3-17.

EST3 Installation and Service Manual 3.43

Access control applications

Control panel

Power supply

24 Vdc

CRC

24 Vdc

CRC

24 Vdc

Remote power supply

24 Vdc

CRC

24 Vdc

Figure 3-17: Wiring for remote power supply

Power supply

Jumper settings determine the power source and usage for the

CRC. Configure the input power as DC. Configure the output power as continuous.

Note that additional power supplies must be listed for fire alarm applications, must have ground fault detection disabled, and must have a circuit ground that is isolated from earth ground.

Hardware configuration

The control panel must contain the following rail modules:

• 3-SSDC(1) Single Signature Controller module

• 3-SAC Security Access Control module

• 3-PPS/M Primary Power Supply module

The 3-SSDC(1) module supports the SIGA loop, which supervises the remote power supply

The 3-SAC module supports the SAC bus. Power for the CRC is normally taken from the 3-PPS/M and is routed with the data lines in a cable composed of two twisted-pair wires. In this case the power from the 3-PPS/M is simply passed through the CRC.

The remote power supply is supervised by the 3-SSDC(1) module via the Signature loop. The remote power supply must share a common ground with the 3-PPS/M.

SDU programming

When programming the system for this application, you’ll need to configure the CRC and define the appropriate lock type in the

SDU. This can be either a strike or maglock.

3.44 EST3 Installation and Service Manual