Issue
Erie controllers SR-201, 301,601, 201-AT, 301-AT, and 601-AT. Voltage apparent on unpowered Relay Terminals.
Environment
- SR-201
- SR-301
- SR-601
- SR201AT
- SR301AT
- SR601AT
Cause
The large foil surfaces used to carry the high currents of the switched loads of these control boards act as antennas causing the DMM to read a voltage signal.
Resolution
The voltage as read L2 to X1 approximately 12 VAC and L2 to X2 approximately 25 VAC is not harmful to humans or equipment and will not affect the operation of the unit. When determining if these induced voltages are present, all wiring except power wiring to L1 and L2 should be disconnected.
