Section 4.4 Interpreting The Led Indicators - Spectrum Controls SLC 500 User Manual

4-2 Chapter 4: Testing your Module
WARNING
Section 4.3
Powering Up
Section 4.4
Interpreting the LED Indicators
User's Manual Pub. 0300128-04 Rev. A
• 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.
UNEXPECTED EQUIPMENT 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.
When you apply power to the system, your module's 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 rest of the SLC 500 system is not receiving power.
•
The rack slot where your module is located is defective.
•
Your module is defective.
•
Your output module has 5 LEDs: 4 channel status LEDs (numbered 0–3 for
channels 0–3, respectively) and 1 module status LED.
Figure 4-1. LED Block