3Rw40: Troubleshooting - Siemens SIRIUS 3RW30 Manual

6.5

3RW40: Troubleshooting

Warning
Impermissible I /CLASS setting
e
(control voltage present, no start
command)
Start inhibited, device too hot
Fault
Impermissible electronics supply
voltage:
Impermissible I /CLASS setting
e
and IN (0->1)
(control voltage present, IN start
command changes from 0 to 1)
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005
Cause
The rated operational current I
the motor (control voltage present, no
start command) exceeds the associated,
maximum permissible setting current
referred to the selected CLASS setting
(chapter Motor current settings
(Page 120)).
The acknowledgment and the motor start
are inhibited for a defined time by the
inherent device protection following an
overload trip, to allow the 3RW40 to cool
down.
Possible causes
Too many starts,
•
Motor starting time too long,
•
Ambient temperature in switching
•
device's environment too high,
Minimum installation clearances not
•
complied with.
Cause
The control supply voltage does not cor-
respond to the soft starter's rated voltage.
The rated operational current I
the motor (control voltage present, start
command present) exceeds the associ-
ated, maximum permissible setting cur-
rent referred to the selected CLASS
setting (chapter Motor current settings
(Page 120)).
For the maximum permissible settings,
refer to chapter Technical data
(Page 127).
6.5 3RW40: Troubleshooting
Remedy
set for Check the rated operational current set
e
for the motor, select a lower CLASS set-
ting, or calculate the soft starter with a
size allowance.
As long as the 3RW40 is not controlled
IN (0->1), this is only a status signal.
However, it becomes a fault signal if the
start command is applied.
The device cannot be started until the
temperature of the thyristor or the heat
sink has cooled down enough to guaran-
tee sufficient reserve for a successful
startup. The time until restarting is al-
lowed can vary but is a minimum of 30 s.
Rectify the causes and, if necessary,
retrofit the optional fan (for 3RW402. to
3RW404.).
Remedy
Check the control supply voltage; could
be caused by a power failure, voltage dip,
or incorrect control supply voltage. Use a
stabilized power supply unit if due to
mains fluctuations.
set for Check the rated operational current set
e
for the motor, select a lower CLASS set-
ting, or calculate the soft starter with a
size allowance.
Messages and diagnosis
63