
© 1998–2003 Schneider Electric All Rights Reserved
Chapter 3—Diagnostics and Troubleshooting VVDED397047USR6/03
Fault Codes and Messages 06/2003
106
OtF
MOTOR OVERHEATING
Motor temperature too high.
1. Check the motor ventilation, ambient
temperature, and motor load.
2. Check the type of thermal sensors
used.
PHF
INPUT PHASE LOSS
• Input phase loss.
• Power fuses blown.
• Input line failure (t > 1s).
1. Check the input line voltage
(Procedure 2 on page 101).
2. Check the fuses and circuit breaker
(Procedure 3 on page 102).
3. Reset.
AnF
RAMP NOT FOLLOWED
• Ramp not followed.
• Motor rotation speed opposite from
speed reference.
1. Check the adjustment and wiring of
the speed feedback.
2. Check the adjustments against the
load.
3. Check the sizing of the motor/drive
controller combination. Dynamic
Braking may be necessary.
SCF
MOT SHORT CKT
Short circuit or grounding on drive
controller output.
1. Remove all power. With the drive
controller disconnected, check the
connecting cables and motor
insulation.
2. Check the drive controller transistors.
SLF
LOSS OF RS485
Bad connection between the drive
controller and the programming
keypad display.
Check the connection between the drive
controller and the programming keypad
display.
SOF
OVERSPEED
• Instability
• Overhauling load
1. Check parameter adjustments.
2. Add dynamic braking.
3. Verify the sizing of the motor, drive
controller, and load.
SPF
SPEED FEEDBACK FAULT
Loss of speed feedback. Check the wiring of the sensor.
tSF
THERMAL SENSOR FAULT
Bad connection between the motor
thermal sensors and the drive
controller.
1. Check the connection between the
thermal sensors and the drive
controller.
2. Check the thermal sensors.
USF
UNDERVOLTAGE
• Supply is too low.
• Temporary voltage drop
(t
≥ 200 ms).
Check the input line voltage (Procedure 2
on page 101).
Table 27: Fault Codes and Messages (continued)
Fault/Message Probable Causes Corrective Actions
Table 28: Overvoltage/Overbraking Trip and Reset Points
Overvoltage Trip
Point
Overbraking Trip
Point
Reset Point
ATV58••••M2 395 Vdc 415 Vdc 385 Vdc
ATV58••••N4 800 Vdc 840 Vdc 785 Vdc
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