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Fault tracing
3ADW000379R0501 DCS550 Manual e e
1. the drive is immediately tripped with F522 SpeedFb
2. the speed feedback is switched to EMF and the drive is stopped according to E StopRamp (22.11), then
F522 SpeedFb is set
3. the speed feedback is switched to EMF and A125 SpeedFb is set
In case of field weakening, the drive is immediately tripped with F522 SpeedFb.
Stall protection
The stall protection trips the converter with F531 MotorStalled when the motor is in apparent danger of
overheating. The rotor is either mechanically stalled or the load is continuously too high. It is possible to adjust
the supervision (time, speed and torque). The stall protection trips the drive if:
1. the actual speed is below StallSpeed (30.02) and
2. the actual torque - in percent of MotNomTorque (4.23) - exceeds StallTorq (30.03)
3. for a time longer than programmed in StallTime (30.01).
Overspeed protection
The motor is protected against overspeed e.g. in a case when the drive is in torque control mode and the load
drops unexpected. Set the overspeed level by means of M1OvrSpeed (30.16). Exceeding this level causes
F532 MotOverSpeed.
Field undercurrent
The nominal value of the field current is set with M1NomFldCur (99.11).
Set the minimum field current level by means of M1FldMinTrip (30.12). Undershooting this level causes F541
M1FexLowCur. FldMinTripDly (45.18) delays F541 M1FexLowCur.
Tacho / pulse encoder polarity
The polarity of the analog tacho or pulse encoder [depending on M1SpeedFbSell (50.03)] is checked against
the EMF. A wrong polarity generates F553 TachPolarity.
Tacho range
An imminent overflow of the AITacho input generates F554 TachoRange. Check for the right connections
(X1:1 to X1:4) on the SDCS-CON-F.
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