Lenze E84AVSCx 8400 StateLine C - Manual (Page 54)

7 Diagnostics & troubleshooting
7.6 Maloperation of the drive
54
Lenze · 8400 StateLine · Operating instructions · from Firmware V06.00 · DMS 1.2 EN · 12/2012 · TD05
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Motor consumes too much current
Torque dip in the field weakening range or
motor stalling during operation in the field weakening range
Asynchronous motor with feedback rotates without control and with too low speed
Motor phase (LP1) monitoring does not respond if the motor phases are interrupted
Cause Remedy
V
min
boost has been selected too high Correct setting with C00016
V/f base frequency has been selected too low Correct setting with C00015
Rated motor data (stator resistance, speed, current,
frequency, voltage) and cos ϕ and/or magnetising
inductance is not adapted to the motor data
Execute automatic motor parameter identification with
the C00002/23 device command
- or -
Adjust motor parameters manually:
C00084: Motor stator resistance
C00087: Rated motor speed
C00088: Rated motor current
C00089: Rated motor frequency
C00090: Rated motor voltage
C00091: Motor cosine phi
C00092: Motor magnetising inductance
Cause Remedy
Motor is overloaded Check motor load
Motor windings are wired incorrectly Reverse from star connection to delta connection
V/f reference point is set too high Correct setting with C00015
Override point of field weakening is set too low Correct setting with C00080
Cause Remedy
Motor phases have been interchanged
• Thus the rotating field of the motor is not identical
anymore with the rotating field of the feedback
system.
• Therefore, the drive shows the following behaviour if
V/f characteristic control (C00006 = 7) is performed:
• The motor rotates faster than the speed setpoint by
the value set in C00074.
• After the controller has been enabled, the
controller will not stop if the speed setpoint = 0 or a
quick stop (QSP) occurs.
• Among other things, the final motor current
depends on the value set for the V
min
boost and
may rise up to I
max
which can trigger the "OC5: Ixt
overload" fault message.
Check the phase position of the motor cable
If possible: Operate the motor with deactivated feedback
(C00006 = 6) and check direction of rotation of the motor
Cause Remedy
Monitoring is not active (C00597 = 0) Activate monitoring (C00597 = 1)