IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 206
PULSDEV
Pulse Deviation
Pulse Deviation. The pulse input into terminal
RP compared to the pulse output from terminal
MP is greater than the percentage programmed
into H06-09.
1. During operation, verify that
there is an incoming pulse
signal on the RP terminal,
viewable at U01-54.
2. Increase the deviation margin
percentage in parameter
H06-09.
X
RF
Braking Resistor Fault. The resistance of the
braking resistor is too low, or the proper braking
resistor has not been installed.
1. Verify correct braking resistor. X
RH
Braking Resistor Overheat.
Deceleration time is too short and excessive
regenerative energy is flowing back into the VFD.
1. Verify correct braking resistor. X
RR
DynBrk Transistr
Braking Transistor Fault. Internal Braking
transistor failed.
1. Verify that the external braking
resistor is connected to the
proper terminals.
2. Confirm that the proper
resistor is installed.
3. Check for a short circuit across
the braking resistor.
X
SC
Short Circuit
Short Circuit Fault. The VFD has detected an
output short circuit condition.
1. Disconnect the motor from the
VFD.
2. Check for a short circuit in the
motor or wiring using a
megger.
X
SLC
Slack Cable
Detection
Slack Cable Fault. A hoist slack cable condition
occurred.
1. May not require corrective
action.
2. Check proper programming of
Slack Cable Detection (C11-
xx).
X
SNAP
Snapped Shaft
Snapped Shaft Fault. A drive train discontinuity
has been detected.
Alarm or fault defined by C11-09.
1. Check for loose or broken
coupling.
2. Check for loose encoder(s).
3. Check for broken shaft.
XX
TST END
Exit Test Mode
Exceeded the 10 minute time limit. 1. Ensure the test mode MFDI is
OFF.
2. Reset the fault (Fault Reset
MFDI, Keypad, or cycle
power).
3. Ensure that test mode is not
used for normal operation.
X
UBNC
Unbalanced Cur
Current Unbalance. Current flow has become
unbalanced.
Exclusive to 4810 and 41090 models.
1. Check wiring.
2. Check for damaged
transistors.
3. Check for short circuits or
grounding problems on the
connected motor.
X
Code Fault/Alarm Description Corrective Action Fault Alarm
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