3.13
DIAGNOSIS:
Check POWER LED (see next page – Inputs & Outputs) – to be on when the PLC is switched on. If the light is OFF, PLC
may have failed. Check for proper connection of cable at PLC & at interface. If light is not on – check the (2 amp) PLC
fuse. If the fuse is OK, check power to it.
PROBLEM #5 – NO BLADE SPEED DISPLAY
POSSIBLE CAUSES:
1. Fault at proximity sensor
x
Bad sensor, misadjusted sensor (gap should be approx. 0.015”)
x
Contamination on the end of the sensor
2. Fault at the PLC
x
Bad connection of sensor wiring
x
Faulty PLC input
DIAGNOSIS:
Check for LED light on the sensor – light on indicates proximity sensor power connections are correct and sensor is ac-
tivated. Problem could be with sensor, signal wire to the PLC or with the PLC. With blade running, proximity LED should
pulse. Likewise, the PLC input LED (X2) should be pulsing. If both LEDs are pulsing with the blade running, the PLC is the
problem. If the sensor LED is pulsing but the input (X2) LED is not; there is a problem between the sensor and the PLC
input (X2) terminal. If the LED on the sensor is not on, the problem is with the sensor wiring or the sensor is at fault.
MITSUBISHI 100 INPUTS AND OUTPUTS
INPUT AND OUTPUT TERMINAL IDENTIFICATION
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of terminals. Input and output LED numbers correspond to the Input or Output of the same number.
i.e. Input LED #0 corresponds to Input X0. Output LED #0 corresponds to Output Y0.
PLC STATUS INDICATORS:
Power
– on when power exists to the PLC
Run
– on when the PLC is running
Batt V
– on when PLC memory backup battery has low voltage condition
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Summary of Contents for S-20 A
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Page 55: ...4 1 SECTION 4 ELECTRICAL MAIN PANEL COMPONENT LAYOUT ...
Page 58: ...4 4 MAIN PANEL COMPONENT LAYOUT 1OL 2OL VFD 1M 2M POWER SUPPLY ...
Page 63: ...5 3 FOR HYDRAULIC SCHEMATICS AND PLUMBING DIAGRAMS SEE PDF ON ATTACHED CD ...
Page 64: ......
Page 65: ...6 1 SECTION 6 MECHANICAL ASSEMBLIES For Mechanical Assembly Drawings see PDF on attached CD ...
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