D7212GV2 | Operation and Installation Guide | 11.0 Arming Devices
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Bosch Security Systems, Inc. | 5/05 | F01U003805B 45
Wire Limits for Individual Keypads
• Limit most keypads to 610 m (2000 ft) per run.
• Limit D9210B Modules to 457 m (1500 ft) per run
(762 m [2,500 ft] if using an external power
supply).
• Limit D9131A Modules to 305 m (1000 ft) per run.
Extra Power for More Keypads
The D1255 Command Center draws 104 mA when
idle. It draws 206 mA with the keys lit and the sounder
activated. Review Section 6.0 Power Outputs on page 23
to determine the total power output requirements for
the system.
One or more D8132 Battery Charger/Power Supply
Modules can be added for the number of keypads
used. Figure 18 shows the D8132 powering keypads in a
stand-alone configuration.
For UL Certificated accounts, use a UL Listed auxiliary
12 VDC or 24 VDC regulated, power-limited power
supply for Fire Protective Signaling Units and
Commercial or Residential Burglar Units. The D8132
is not UL Listed as a stand-alone power supply.
The control panel and the D8132 (or other
power supply) must share COMMON.
Figure 18 shows the common form of the
D8132 Module connected to the common on
the keypad and the common on the control
panel. Any stand-alone power supply,
powering any device connected to the control
panel, must also be connected to a common
terminal on the control panel.
If using the ground fault detection capability
on the D7212GV2 Control Panels with an
external power supply, ensure that the
external selected power supply isolates its
earth ground connection from the negative
side of the auxiliary power output. External
power supplies that do not isolate earth
ground can cause ground fault conditions on
the control panel.
Figure 18: Power at Keypads
1
2
2
3
3
4
4
5
1 - To control panel
2 - +12 VDC
3 - Data
4 - Common
5 - D8132 or external power supply
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