Siemens SIRIUS 3RW44 User Manual page 121

Message
Current range exceeded
Motor stalled - switched off
(for product version < *E07* devices
only)
Overcurrent
(for product version < *E07* devices
only)
Power unit overheated
Power unit overtemperature
Temperature sensor short-circuit
Temperature sensor open
Temperature sensor overload
Max. starting time exceeded
Current limit exceeded / undershot
Ground fault detected
Manual operation local connection
break
SIRIUS 3RW44 manual
GWA 4NEB 535 2195-02 DS 06
Cause / Remedy
x 1. A very high current has occurred (beyond the measuring range of the current transformers
integrated in the soft starter). This may happen in the case of: direct on line starting,
breakaway pulses or combined braking.
Remedy: If the "Voltage ramp"" starting mode is selected, extend the set ramp time or
lower the breakaway voltage or braking torque. The soft starter may be dimensioned too
small for the motor.
2. If this message is issued during start-up, it may have been mistakenly issued because one
of the following messages was generated too often: "Prewarning limit motor heat build-up",
"Remaining time for tripping" or "Current limit exceeded/undershot" (can also be traced via
the entries in Log list / Events).
Remedy: Refer to the description of the respective messages.
x A very high current suddenly occurs in bridging mode, e.g. when the motor stalls (I >
4 x I higher than 100 ms).
eMotor
Remedy: Check motor.
x A current of more than 6 times the rated operating current has occurred for a long period of
time.
Remedy: Activate current limiting or check dimensioning (device/motor).
x x Overload trip of the thermal model for the power unit.
Remedy: Wait until the device has cooled down, perhaps set a lower current limit or
reduce the switching frequency (too many starts in succession).
Check whether the motor is blocked or the ambient temperature is too high in the vicinity of
the soft starter (for derating above 40 °C, refer to Chapter 10.3 "Technical Data").
x The temperature of the thermal model for the power unit is higher than the permissible
temperature for continuous operation.
Remedy: Check the motor operating current or check if the ambient temperature is too
high in the vicinity of the soft starter (for derating above 40 °C, refer to Chapter 10.3
"Technical Data").
x x x Temperature sensor is short-circuited at terminals T1 / T2.
Remedy: Check temperature sensor.
x x x Temperature sensor faulty at terminals T1 / T2, one line is not connected or no sensor is
connected at all.
Remedy: Check temperature sensor or, if none is connected: deactivate temperature
sensor.
x x x Temperature sensor has tripped at terminals T1 / T2, motor overheated.
Remedy: Wait until the motor has cooled down and, if necessary, check motor.
x The set maximum starting time is shorter than the actual run-up time of the motor.
Remedy: Extend "Max. starting time" parameter, increase current limiting value or check
load connected to the motor for mechanical faults.
x x Set current limit has been exceeded or undershot, e.g. due to a clogged fan filter or by the
motor stalling.
Remedy: Check the motor / load for the reason for the current limit value violation, or
adjust the limit value according to the existing load conditions.
x x One phase is connected to ground (only possible in bypass operation).
Remedy: Check connections and wiring.
x Connection to the PC has been interrupted (if PC-controlled) or (if motor is key-controlled)
no key has been pressed for a long period of time (see Settings > Display > Activity
monitoring time in Chapter 5.4.10).
Control will be handed over to the inputs if these have requested control priority.
Remedy: Reconnect the PC or increase activity monitoring time and press a key at regular
intervals.
Diagnosis and Messages
7-5