Full Height Turnstile MPT-152
Troubleshooting
59
10.1.4 Error message – motor control unit MMC-120
Fig. 33: 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.
Qualified
electrician
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.
Qualified
electrician
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.
Qualified
electrician
Red LED is
flashing
Error
Number of blink impulses indi-
cates the error code.
Qualified
electrician
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".
Qualified
electrician
Table 10: Description of the LEDs on the MMC-120