Magnetek Elevator Quattro DC - Page 110

Quattro DC Troubleshooting
108
Name Description
Possible Causes & Corrective Action
Line HI Volts
Line voltage is greater than
max drive rating. Monitored via
the DC Bus.
Line Voltage is too High
 Verify DC Bus is reading voltage correctly
 Verify Line voltage is set correctly
LS A to D
The Analog to Digital
conversion on the line side
control board is not working
properly.
Line Side Analog to Digital Conversion
incorrect
 Replace Line Side Main and Power Interface
PCBs
LS AC CNTCR
The main AC power contactor
is not following the commanded
state within 1 second.
AC Power Contactor Problem
 Check for faulty UTM contactor coil or
interlocking aux contact blocks on PCM or
UTM
 Check A8 TB3-9 has 24Vdc, it then goes
through the aux on the UTM to A8 TB3-18,
with the line power off close UTM, the 24V on
A8 TB3-18 should go to zero. If this checks it
may be a bad product interface PCB on the
line side
 CAUTION: Do not manually engage the UTM
contactor with power applied.
LS BRDG GND
The hardware has detected a
ground fault on the line side
power bridge.
IGBT Breakdown
 Inspect and measure for physical voltage
breakdown damage on IGBTs and DC bus
LS Charge
The DC bus voltage has not
stabilized above the voltage
fault level within 2 seconds or
the charge contactor has not
closed after charging
OR
The DC bus voltage is below
the UV Fault level as defined
by the INPUT L-L VOLTS (A5)
and UV FAULT LEVEL (A4)
parameters
Please note, if LS Charge
occurs 3 consecutive times, the
drive will require a power cycle
to reset the fault
Low Input Voltage
 Check INPUT L-L VOLTS (A5) and UV FAULT
LEVEL (A4) parameters
 Verify proper input voltage and increase, if
necessary, the input AC voltage within the
proper range
 Check for a missing input phase
 Check power line disturbances due to starting
of other equipment
Incorrect Setting
 Verify the PCM pulls in
 Observe DC BUS VOLTS (D3) and verify it
increases until the fault occurs
 Observe DC BUS VOLTS (D3) decreased
after the fault as occurred
DC Bus Problems
 Observe DC BUS VOLTS (D3)
 Manually push in PCM, do not hold for longer
than 1s!! Does the bus voltage rise, if so does
it decay slowly or rapidly drop to zero.
 If it stays at zero or drops quickly, it indicates
the bus is shorted.
Hardware Failure
 Possible Damaged Product Interface Board
 Possible Damaged Pre-Charge Resistor and /
or Pre-Charge Contactor
 Possible field module failure / shorted motor
field