SCC Fault Isolation Manual 6/03/2020
Page 10 of 11 Rev. 01 9/20/2021
7. Stroke Counter and Strokes/Min do not count
7.1. The Stroke Counter will only count when in pump forward. Do you see the Stroke Counter symbols on the Homepage?
7.1.1. NO: Go to the Configuration screen and enable the Stroke Counter option.
7.1.2. YES: Check the stroke counter proximity switch and make sure it lights up when you place something metal in front of it. Does it light up?
7.1.2.1. NO: Replace sensor or troubleshoot power/ground to the sensor.
7.1.2.2. YES: On this display, go to the I/O page and look for IN08ex (Stroke Counter). Place something metal in front of the sensor, does the input light up?
7.1.2.2.1. YES: Call Schwing Service Tech.
7.1.2.2.2. NO: Replace the sensor, then troubleshoot wiring between sensor and PLC.
8. Work Lights do not work
8.1. Go to the Display and check the I/O page. Find OUT26 (Work Lights). Does the output turn on?
8.1.1. NO: Check the Maintenance screen for error messages. If there is error messages, troubleshoot the error message. If not, then call a Schwing Service Tech.
8.1.2. YES: This circuit runs through a lot of harnesses. Troubleshoot the circuit using the schematic. A good place to start is to make sure the lights work and are properly grounded.
9. Hopper Light does not work
9.1. The Hopper Light has constant power and is not controlled by the CPC3 system. Check fuse F11 then troubleshoot circuit using schematic. The ground is provided from the chassis frame.
10. System does not turn on
10.1. Check fuses/circuit breakers: F2, F3, F4 and F18 in the PDM. Check for power and ground at the PDM terminal studs. Do you have power at the terminal studs?
10.1.1. NO: Go to the battery box and find the ignition relay. Make sure the relay is turning on and the fuses in the battery box are good. Troubleshoot as needed with the original system schematic.
10.1.2. YES: Ensure all connectors on the PDM are tight then call a Schwing Service Tech.
11. Radio Display shows “NO CAN BUS MESSAGES”
This happens when the Radio is linked but the Receiver is not able to communicate with the PLC. This is a normal message while in Maintenance Mode.
11.1. Make sure the PLC is working and then check the CAN lines between the PLC and Radio.
12. Radio Display has the “E” indicator light lit up.
This happens when there is an error message on the unit and it has not been acknowledged yet.
13. “No Comms HMI<>PLC”
13.1. This message comes up when the Comms between the PLC and the Display are not working. The system may partially still work. Look at the PLC, is there a light on the side above the connector?
13.1.1. NO: Go to page 9 section 2. Primary PLC does not turn on (No lights on PLC)
13.1.2. YES: RED Light: Either reprogram the PLC or replace it.
13.1.3. YES: GREEN Light: Does the rear keypad work?
13.1.3.1. YES: The CAN lines between the Display and the PLC are not functioning. Use the schematic and trace the pins from the Display (Pins 4 and 5) to their splices. One of those two wires is broken.
13.1.3.2. NO: Disconnect the “I/O Harness” from the control panel. Does the display error go away?
13.1.3.2.1. YES: There is problem with the rear keypad or harness. Replace the rear keypad or troubleshoot pins 3 and 4 on the I/O harness that runs to the rear keypad.
13.1.3.2.2. NO: Plug in the I/O harness. Disconnect the Display. Does the rear keypad become functional?
13.1.3.2.2.1. YES: Reprogram the Display or replace it.
13.1.3.2.2.2. NO: The problem is inside the panel. Use the schematic and trace pins 29 and 47 from the “PLCST” connector.
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