Emergency Mode; Emergency Start - Siemens SIRIUS 3RW55 Equipment Manual

8.11

Emergency mode

8.11.1

Emergency start

Operating principle
The system can continue to be operated in the case of system faults with the "emergency start"
function. This is necessary for systems in which the product becomes unusable without
continued operation, e.g. glue and paint production. In crusher plants, in which a disconnection
makes any further startup impossible in certain situations, continued operation is also
necessary.
The emergency start is activated only if it has been enabled and a trip command exists due to a
system fault. The motor is switched on by means of a normal control command.
NOTICE
Damage to the system
If the Emergency start function is activated, both system defects and system protection
messages are ignored. This can cause further damage in the system.
In the case of some faults, the motor can be started via the "Emergency start" function despite
a pending group error:
• Phase asymmetry limit exceeded
• Electronic motor overload protection
• Temperature sensor wire break
• Temperature sensor short-circuit
• Temperature sensor overload
• Maximum starting time exceeded
• I
• Ground fault detected
Requirements
• Ex operation not active
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
limit value exceeded/undershot
e
Functions
8.11 Emergency mode
189