8400 StateLine C | Reference manual
Diagnostics & error management
Operation without mains supply
400 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
9.8 Operation without mains supply
The following display parameters have a value of "0" if the mains supply is switched off and
the external 24 V supply of the controller is switched on:
An asynchronous
motor with feedback
rotates without
control and with too
low speed
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
Motor phase (LP1)
monitoring does not
respond if the motor
phases are
interrupted
Monitoring is not active (C00597
= 0) Activate monitoring (C00597 =1)
Maloperation Cause Remedy
Parameter Info
C00050 MCTRL: Speed setpoint
C00051 MCTRL: Actual speed value
C00052 Motor voltage
C00053 DC-bus voltage
C00054 Motor current
C00058 Output frequency
C00061 Heatsink temperature
C00064/1...3 Device utilisation (Ixt)
C00066 Thermal motor load (I²xt)
C00177 Switching cycles
C00725 Current switching frequency
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