Spectrum Controls 1746sc-INI4vi - Manual (Page 48)

44 SLC 500 ™ Isolated Analog Input Modules
2. Ensure that the shield for the cable used to wire your module is
properly grounded. Refer to Chapter 2, Installing And Wiring Your
Module, for more information.
3. Ensure that the removable terminal block on your module is secure.
Disconnecting Prime
Movers
Before testing your module, ensure that machine motion will not occur:
• Disconnect motor wires at the motor starter or the motor itself. This
lets you test the operation of the starter coil, verifying that the output
circuit is wired correctly and functioning.
• Disconnect solenoids by disengaging the solenoid valves, leaving the
coils connected.
If you cannot disconnect a device in the preferred way, open the output
circuit as close as possible to the motion-causing device.
Example – If you have a relay coil that in turn energizes a motor starter
and you cannot disconnect the motor wires, open the circuit at a point
between the motor starter and the relay contact.
WARNING
POSSIBLE UNEXPECTED MACHINE MOTION
During all testing, always disconnect all devices that, when
energized, might cause machine motion.
Failure to observe this precaution can cause equipment damage
or personal injury.
Powering Up When you apply power to the system, the module status LED should
illuminate, indicating that your module is receiving power and has
completed its onboard self-test. If the LED does not illuminate after
several seconds, your module is not functional. Discontinue testing until
you can get the LED to illuminate.
The most probable reasons for the LED not illuminating are:
• The SLC 500 system is not receiving power from its power supply.
• The rack slot where your module is located is defective.
• Your module is defective.
!