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12
PRSU Series, Operating Instructions Manual (Revision 1.0)
Fault Diagnostic and Subsequent Measures
If the controller appears to be operating erroneously, please use the following
diagnostic guide to determine what action should be taken.
Ground fault AC/DC
(with electronic fuse
protection)
If the input fuse blows and the output contacts open, safely locate the source
of the fault and correct it, then
replace the input fuse and follow the “Device
Startup Verification” procedure on Page 6 of this manual. If normal operation
of the device does not resume, retire the device and send to Tapeswitch
Corporation for evaluation.
Faulty/welded
Contact
In the case of welded contacts, the device can no longer implement its
intended function. Retire this device and send back to Tapeswitch
Corporation for evaluation.
Only one or no
LED illuminates
In cases where either one or both “Channel” LEDs is OFF during normal
operation, please verify that the device is properly wired. If the problem
persists, the device is no longer capable of service. Retire the device and
send to Tapeswitch Corporation for evaluation.
Excessive contact-
to-contact resistance
In cases where the device does not appear to operate properly, perform the
following checks (cables removed from controller ports):
1. Upper (cables between S22 and S21) conductor plus total cable
resistance in the unactuated state. Must be less than 10Ω.
2. Lower (cables between S11 and S12) conductor plus total cable
resistance in the unactuated state. Must be less than 10Ω.
3. Upper to lower (cables going from S11 to S21) conductor plus total
cable resistance. Measure at both sides (includes S21 to S22) during
actuation
. Must be less than 200Ω.
If the results exceed the stated limits, the system will need one or more
additional controllers to conform to the maximum resistance parameters per
relay.
If the results are within the allowable limits and the controller is still not
working, contact Tapeswitch as the unit is likely faulty.
