7000 Series Installation and Programming Guide | Digital Monitoring Products, Inc. 9
Additional Power Supply
If the current draw for all keypads exceeds the panel output, provide additional current by
adding a Model 505-12 auxiliary power supply.
1. Connect all keypad black ground wires to the power supply negative terminal.
2. Run a jumper wire from the power supply negative terminal to the panel common
ground terminal.
3. Connect all keypad power (+12VDC) wires to the power supply positive terminal.
Do not connect the power supply positive terminal to any panel terminal. Refer to
the 505-12 Power Supply Installation Guide if needed (LT-0453).
Keypad Bus Monitor
For listed fire protective systems, the 893A Module or 277 Trouble Sounder must be
installed on the XR150/XR550 Series panel to monitor the keypad bus. It should be
programmed to sound when the keypad bus fails to operate.
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