SCU 1284 Relays

Issue

Leakage voltage on relays

Product Line

TAC I/NET

Environment

I/Net Seven versions using SCU 1284's.

Cause

There is a small leakage current through the integrated MOV transient suppressor across the NC and NO contacts on the four relays that are used to control the door locks.

Resolution

If the relay is connected to a very high impedance (electronic) device input where it is falsely detecting as a relay ON condition, there are two things that can be done:

1. Place a 10,000 Ohm resistor on the device input to ground (or relay output to ground)

2. Move to one of the other unsuppressed relays ( relay 3, 4, 7 or 8)