Quattro DC Troubleshooting
119
Name Description
Possible Causes & Corrective Action
Sft Cn Not
Closed
Safety Chain was closed and
motor contactor power was
removed after the contactor
has been confirmed as picked.
Improper drive On-Run-Stop sequencing
Verify Safety Chain operation
Verify Safety Chain timing
Verify that the correct A8 PCB is installed,
46S04174-0010 works with the 240V Safety
chain power and the -0020 works with the
120V Safety chain power.
Hardware problem
Verify wiring to A6TB1-2, this input is on, if the
contactor power is on.
If the above point is not on, check at A8TB4-1
& A8TB4-4, this is the input for the 120 or
240Vac control power.
Verify that the correct A8 PCB is installed,
46S04174-0010 works with the 240V Safety
chain power and the -0020 works with the
120V Safety chain power.
Speed Dev
(alarm)
The speed feedback is failing
to properly track the speed
reference.
Sensitivity determined by SPD
DEV HI LEVEL (A1) parameter.
Any active faults?
Check if any active faults in F1 sub-menu
Check Parameters Settings:
Verify SPD DEV HI LEVEL (A1) is set to the
proper level.
Does “Hit CURRENT Limit” message appear?
If message appears during running, verify a
fault has not occurred.
Then, increase the torque limit parameters MTR
TORQUE LIMIT and REGEN TORQ LIMIT (A1) –
maximum 250%
Srl Timeout
The drive is being operated by
serial communications and one
of the following has occurred:
Communication time-out – The
drive did not receive a valid
run-time message within 40ms
while running
Bad message checksum –
Drive has detected 3
consecutive bad message
checksums
Bad Serial Connection
Remove and re-seat the RS-422 serial cable
Check car controller serial driver board
Check the serial cable connected to the drive’s
RS-422 port
The Customer I/O PCB on the drive may need
to be replaced
Possible problem with car controller serial
communication
Grounding Issue
Check grounding between car controller and
drive
Noise on serial channel due to the cable
TQ LIM 2Hi
4CUBE
The torque limits (based on the
defined motor) exceed the
cube’s capacity.
Example:
A6(Rated Motor I) x A1(Ilim) /
100 cannot exceed the rating of
the Quattro.
Check Parameter Settings
Verify motor nameplate values are entered
correctly in the A6 submenu
Decrease CURRENT LIMIT (A1), until the
formula is satisfied. If more accel amps are
required then a larger drive will be needed.
Drive Sizing
Verify drive sizing.
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