Power Connection; Entry Control Unit - DPS Telecom ECU LAN User Manual

For the building access system or stand-alone applications

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3.5

Power Connection

The Grounding Lug on the side of the unit provides a permanent connection to earth ground when

connected. The Grounding Lug must be used in order to comply with CE standards.

Before you connect a power supply to the ECU, test the voltage of your power supply:

· Connect the black common lead of a voltmeter to the ground terminal of the battery, and connect the red lead of

the voltmeter to the battery's –48 VDC terminal. The voltmeter should read between –43 and – 53 VDC. If the

reading is outside this range, test the power supply.

To connect the ECU to a power supply, follow these steps:

1. Always use safe power practices when making power connections. Be sure to remove fuses from the fuse

distribution panel, as well as the ECU, before making your power connections.

2. Use the grounding lug to connect the unit to earth ground. The grounding lug is next to the symbol

eyelet of the earth ground cable between the two bolts on the grounding lug (Ground cable not included).

3. Insert a battery ground into the power connector plug's right terminal and tighten the screw; then insert a battery

line to the plug's left terminal and tighten its screw.

4. Insert a fuse into the fuse distribution panel and measure voltage. The voltmeter should read between –40 and –

ECU LAN GMT fuse slot, pow er connection, and grounding lug

. Insert the

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