Tweco HMC-410 - Manual (Page 67)

HMC-410
May 5, 2005 5-5
N. Auxiliary relays do not function.
1. Interconnecting cable between control panel and
fixture may have a bad connection or short circuit.
a. Repair or replace interconnecting cable.
2. Fixture control relays failure on controller board.
Interconnect between I/S board and controller
board. Interface/Suppressor board failure.
a. Check relay control signal using diagnostic test
#51 and #52. Replace bad component. If these
go bad, also verify that fixture load is not more
than 115 VAC, 2 A, and that proper load
suppression techniques were employed.