Controlling AC relays from analog outputs on the motherboard or expansion board of the 7718 PCU

[Product_Support]

Issue

Controlling AC relays from analog outputs on the motherboard or expansion board of the 7718 PCU

Environment

I/NET Site

Cause

Controlling AC relays from analog outputs on the motherboard or expansion board of the 7718 PCU

Resolution

The outputs from these locations are DC. This may cause the AC relays to “chatter” or not work at all. It is recommended to use a P8UI8DO at the expansion board or place DC powered, form “C” contacts, pilot relays on the outputs of the PCU. Refer to TCON106 for more details.