Troubleshooting
EP7402-0057
43
Version: 1.3
Bit name
Description
Possible causes
Possible Solutions
Channel
n
motor overload
I2T warning
The calculated I
2
T value cur-
rently exceeds the warning
threshold:
Default: 80 %.
If the warning occurs during the
ramp-up phase:
The output current is too high.
Decrease the parameter “Sen-
sorless offset scaling”:
.
If the warning occurs during con-
tinuous operation:
Mechanical overload.
Reduce the load.
Channel
n
motor overload
I2T error
The calculated I
2
T value has ex-
ceeded the error threshold:
Default: 110 %.
If the error occurs during the
ramp-up phase:
The output current is too high.
Decrease the parameter “Sen-
sorless offset scaling”:
.
If the error occurs during contin-
uous operation:
Mechanical overload.
Reduce the load.
Channel
n
amplifier over-
load I2T warning
The calculated I2T value of the
amplifier currently exceeds the
warning threshold:
Incorrect parameter setting: The
thermal limit of motors that meet
the specifications is usually
much lower than the thermal limit
of the amplifier.
Check the motor parameters:
.
Channel
n
amplifier over-
load I2T error
The calculated I
2
T value has ex-
ceeded the error threshold:
Channel
n
in limit
The current is currently being
limited because the I
2
T value of
the motor exceeds 97 %.
Mechanical overload
You can disable this protective
function by setting the parameter
to TRUE.
Channel
n
commutation er-
ror
The commutation algorithm has
determined that the rotary field
and the rotor are not running
synchronously.
If this bit is set during the ramp-
up phase:
• Mechanical overload
1)
• The output current is too
low.
• The parameter "ramp-up
velocity" is too low.
• Check the motor load.
• Increase the value of the
parameter "Sensorless
offset scaling":
• Reduce the value of the
parameter "Rampup
velocity":
If this bit is set in continuous op-
eration:
The speed (output variable "Ve-
locity") is too low.
Try again with a higher speed.
Increase the value of the param-
eter "Start velocity" (
) to ensure that
the motor does not start with too
low a speed preset.
1)
Especially likely when the motor makes a sound with ascending pitch.