Parameters
Description
Warning limits
Remaining time
for tripping
The 3RW55 and 3RW55 Failsafe soft starters can generate a warning before imminent
motor overload shutdown. The parameter "Remaining time for tripping" defines the time
between the warning and imminent motor overload shutdown. The instant of the im‐
minent motor overload shutdown is calculated on the assumption that the current op‐
erating conditions will continue. The setting "0 s" deactivates the function.
• Factory setting: 0 s
• Setting range: 0 ... 500 s
• In steps of: 1 s
The time until motor overload protection is tripped can be displayed via the measured
value "Remaining time for motor overload protection" (Page 227).
Temperature rise You use this parameter to preset a motor temperature rise value in percent as a warning
limit. The setting "0%" deactivates the function.
• Factory setting: 0%
• Setting range: 0 ... 99%
• In steps of: 1%
Response to overload thermal motor
model
Use this device parameter to specify how the 3RW55 and 3RW55 Failsafe soft starters are
to respond to a motor overload:
• Turn off without restart (factory setting)
On the occurrence of the motor overload, an error is generated and the motor is
tripped. When the parameterized recovery time (cooling time) has elapsed, the error
and the trip can be acknowledged with the "Reset" function.
• Turn off with restart
On the occurrence of the motor overload, an error is generated and the motor is
tripped. When the parameterized recovery time (cooling time) has elapsed, the error
and the motor trip are automatically canceled.
Recovery time
Minimum cooling down time for the motor after a motor overload trip. Reset signals
present during the recovery time have no effect.
• Factory setting: 300 s
• Setting range: 60 ... 1 800 s
• In steps of: 30 s
The remaining recovery time following a motor overload shutdown can be displayed via
the measured value "Remaining motor cooling time" (Page 227).
Non-volatile tripping status
If non-volatile tripping status is activated, the current tripping status of the electronic
motor overload protection is stored in the 3RW55 or 3RW55 Failsafe soft starter. The
current recovery time is only counted down after a motor overload shutdown if a supply
voltage (control supply voltage) is applied to the 3RW55 or 3RW55 Failsafe soft starter.
If the supply voltage (control supply voltage) is switched off in this period, counting
down the recovery time is interrupted until the supply voltage (control supply voltage)
is applied again.
• Yes (factory setting)
• No
Trip class
The trip class (CLASS) specifies the maximum time within which a protective device must trip
from a cold state at 7.2 x the rated operational current I
e
(motor protection to IEC 60947). The
trip class defines the starting time at a particular current before the trip occurs.
Functions
8.3 Motor protection
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
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Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
