Output Connections

WARNING: Under light load conditions and high power line input voltage from the utility company, output voltage from the power supply (28 VAC taps only) may reach 32 VAC. This voltage can cause over-voltage damage on 24 VAC devices. Keep in mind that certain devices produce variable loads, including heaters, blowers, and pan and tilt motion; during operation, minimum voltage requirements may create a light load condition that could cause excessive voltage. Therefore, Pelco recommends using a 28 VAC tap only when the supplied wire size for the given load causes an unacceptable output voltage on the 24 VAC tap. Refer to Table D on page 8 to determine acceptable situations for the 28 VAC tap.

Perform the following steps to attach 24 VAC devices to the WCS Series Power Supply:

1.Refer to Table C on page 7 and Table D on page 8 in this manual or the wiring table on the unit’s lid to determine the output connection needed for your devices.

2.Refer to Figure 1 for the proper connector strip connections.

3.For each device, attach one output wire to the common terminal. Attach the second wire to the appropriate 24 VAC or 28 VAC terminal.

4.When you finish the wiring connections, double-check the installation for safety purposes.

5.Power up the unit with the on/off switch.

6.Use a voltmeter to verify that used outputs are at appropriate voltage levels.

7.Close the lid and secure it using the latch and screw.

6	C654M-E (12/08)