Full Height Turnstile MPT-132
Troubleshooting
59
10.2 Error message – motor control unit MMC-120
Fig. 38: LEDs on MMC-120
1
Red LED for error diagnosis
2
Green LED for indication of the power supply state and the safety
input state
LED
Description
Possible cause /
Troubleshooting
To be carried
out by
Green LED is
OFF.
No power supply
Check power supply.
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Green LED is
flashing
Power supply is present. Safety
input signal is missing.
Missing signal at emergency in-
put IN1 of the MBC-110.
CAN connection between
MBC-110 and MMC-120 defec-
tive.
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Green LED is
ON.
Normal operation
–
–
Red LED is
OFF
No error code
–
–
Red LED is
ON.
External error with emergency
stop
Search for errors in the MBC-110
or in the MMC-120.
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Red LED is
flashing
Error
Number of blink impulses indi-
cates the error code.
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Red and green
LED are ON
Application program has been
erased.
Boot loader is waiting for down-
loading the application program.
Download has been interrupted.
Refer to the following Chapter
"Downloading application pro-
gram".
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Table 10: Description of the LEDs on the MMC-120
