Service manual

37
Troubleshooting
Fault code 36, INTERLOCK HARDWARE
This fault code is generated by the motor control. The motor control must
bepoweredwith230V/50Hzontheinterlockinputinordertodrivethe
motor. The interlock circuits in the motor control have been split into two
channels so that a component fault in motor control cannot give a false
confirmation that the door is locked. These two channels are checked
against each other. If this check gives an incorrect result, the ”INTERLOCK
HARDWARE” fault code will be activated.
The reason for this fault code being activated can be attributed to a fault in
the interlock circuits in motor control.
Action:
• Replacemotorcontrol.
Fault code 37, LOW DC VOLTAGE
This fault code is generated by the motor control unit. The motor control
unit constantly measures the voltage over the mains input. If the voltage
istoolow(=fallsbelowacertainlimit),themotorcontrolunitwillshutoff
thecurrenttothemotor.Oncethemotorhasstopped(=thetachosensor
indicates that the motor is stationary), the motor control unit checks to see
whether the input voltage is still low. If it is, a fault code is activated: ”LOW
DCVOLTAGE”.
The reason for this fault code being activated can be low mains voltage or
thatthemachine’son/offswitchhasbeenoperatedinanunsuitableman-
ner. Further information can be obtained by studying the contents of ”MCU
FAULT LOGGER”:
• UNDERVOLTAGE2(specieshowmanytimesfaultcode37hasbeen
active)
• UNDERVOLTAGE1(specieshowmanytimesthevoltagehasdrop-
ped below the limit. The difference between undervoltage 1 and under-
voltage 2 indicates how many times there has been an undervoltage 1
without it being confirmed when the motor has stopped).
• LASTFAULTCODEN/8(showsthe8latestfaultcodes)
Undervoltages can be registered even during normal operation. Conse-
quently, a small number of registrations need not mean that there is a fault
in the motor control.
Measure:
• Checkthatthesupplyvoltageisstableandneverdropsbelownominal
voltage - 10%.
• Checkthatthefusesandcablesarenotfaulty.
• Checkthesupplyvoltageinthenetworkcablingandatthemotorcon-
trol system in the machine.