Siemens 3RW44 Manual page 144

Diagnostics and messages
8.1 Diagnostics and messages
Message
Prewarning limit - motor heating
Remaining time for tripping
undershot
Line overvoltage
(for devices with product version
< *E04*)
Line voltage too high
(for devices with product version
≥ *E04*)
Current measuring range overshot
Trip - motor blocked
(devices with product version
<*E07* only)
Current range exceeded
Power unit overheated
Power unit overtemperature
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① ② ③
Cause/solution
x Motor heating is greater than the set parameter value: Prewarning limit
- motor heating. The thermal motor model approaches an overload trip
depending on the set value. For heavy starting and set values of
tripping class ≥ CLASS 20, we recommend increasing the "Prewarning
limit motor heating" parameter to 95 %.
x Time up to overload trip of the thermal motor model is shorter than the
set "Prewarning limit - remaining time for tripping" parameter.
In the case of heavy starting and set values of tripping class ≥ CLASS
20, we recommend setting the "Prewarning limit - remaining time for
tripping" parameter value to 0 s (deactivated).
x Applied 3-phase line voltage is not suitable for the device or prolonged
voltage peaks arise.
Tripping is caused by exceeding of the permissible rated control supply
voltage of >10 % >500 ms. As from product version *E02*, the internal
threshold for tripping has been increased to >18 % >2000 ms.
Remedy: Apply the correct voltage.
x
1. A very high current has occurred (above the measuring range of the
current transformers integrated in the soft starter). This can occur in
the event of: direct-on-line starting, breakaway pulse or combined
braking.
Remedy: In the case of the "Voltage ramp" start type, extend the
set ramp time and reduce the breakaway voltage or the braking
torque. The soft starter is possibly dimensioned too small for the
motor.
2. If the message occurs during starting, it may have been generated
erroneously by a too-frequently generated "Prewarning limit - motor
heating", "Remaining time for tripping" or "I
exceeded/undershot" warning (can also be traced via the entries in
the logbook/events).
Remedy: See description of applicable messages.
x A very high current suddenly arises in bypass mode, e.g. if the motor
blocks (I > 4 x I
Remedy: Check the motor.
x More than 6 times the device's rated operational current flowed for a
prolonged period.
Remedy: Activate current limiting or check dimensioning (device and
motor).
x x Overload trip of the thermal model for the power unit
Remedy: Wait until the device has cooled down again, possibly set
lower current limiting for starting, or reduce the switching frequency (too
many consecutive starts).
Check whether the motor is blocked or whether the ambient
temperature in the soft starter's environment is too high (derating as
from 40 °C; see chapter Technical data (Page 253)).
x Temperature of the thermal model for the power unit is above the
allowed continuous operating temperature.
Remedy: Check the motor's operational current or check whether the
ambient temperature in the soft starter's environment is too high
(derating as from 40 °C; see chapter Technical data (Page 253)).
over 100 ms).
eMotor
Manual, 03/2017, NEB535219502000/RS-AB/008
limit
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3RW44 soft starters