Siemens 3RW44 Manual page 145

Message
Temperature sensor short-circuit
Temperature sensor wire break
Temperature sensor overload
Maximum starting time exceeded
I limit value exceeded/undershot
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Ground fault detected
Manual mode local connection
break
Impermissible I /CLASS setting
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3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
① ② ③
Cause/solution
x x x Temperature sensor at terminals T1/T2 has short-circuited.
Remedy: Check the temperature sensor.
x x x Temperature sensor at terminals T1/T2 is defective, a cable is not
connected or no sensor is connected.
Remedy: Check the temperature sensor or if no sensor is connected:
deactivate the temperature sensor.
x x x Temperature sensor at terminals T1/T2 has tripped. The motor is
overheated.
Remedy: Wait until the motor has cooled down and check the motor if
necessary.
x The set maximum starting time is shorter than the motor's actual ramp-
up time.
Remedy: Extend the "max. starting time" parameter, increase the
current limiting value or check the load connected to the motor to
determine whether there is a mechanical defect.
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 cause of current limit violation on the motor/load or
adjust the limits according to the existing load conditions.
x x One phase is connected to ground (only possible in bypass mode)
Remedy: Check connections and wiring.
x The connection to the PC has been interrupted (if control via PC) or no
key has been pressed (if the motor is key-controlled) for a prolonged
time (see Settings > Display > Activity monitoring time in chapter
Selecting display settings (Page 97)).
Control is handed over to the inputs if these have requested control
priority.
Remedy: Connect the PC again or increase the activity monitoring time
and press a key at regular intervals.
x The rated operational current I
motor data (Page 61)) in at least one of the three parameter sets
exceeds the associated, maximum permissible setting current referred
to the selected CLASS setting (chapter Selecting motor protection
settings (Page 94)). In the case of devices with product version ≥
*E07*, the corresponding parameter set (PS) in which the incorrect
value is to be found is displayed.
For the maximum permissible settings, see chapter Technical data
(Page 253).
If the soft starter is connected in an inside-delta circuit, the motor
feeder may have been incorrectly wired (chapter 3RW44 in an inside-
delta circuit (Page 221)); as a result, the "Status display/Connection
type" menu item (chapter Status display (Page 109)) contains
"Unkn./Fault".
Remedy: Check the rated operational current set for the motor in all
three parameter sets, select a lower CLASS setting, or calculate the
soft starter with a size allowance. In the case of an inside-delta circuit,
check that the wiring of the motor feeder corresponds to the specified
circuit diagrams.
As long as the motor is not activated, it is only a status message.
However, the message becomes a fault without restart if a start
command is issued.
Diagnostics and messages
8.1 Diagnostics and messages
set for the motor (chapter Entering the
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