Essential Service Mode - Siemens SINAMICS G120 Operating Instructions Manual

6.11

Essential service mode

In essential service mode (ESM), the inverter attempts to operate the motor for as long as
possible despite irregular ambient conditions.
Note
Warranty is lost in the essential service mode
If you activate the essential service mode, all of the warranty claims associated with the inverter
become null and void. The essential service mode can have the following effects:
● Exceptionally high temperatures inside and outside the inverter
● Open fire inside and outside the inverter
● Emissions of light, noise, particles or gases
The inverter logs the essential service mode and any faults that occur during essential service
mode. The log is accessible only for the service and repair organization.
Example
To improve the air circulation in the stairwells, the ventilation control creates an underpressure
in the building. With this control, a fire would mean that flue gases enter into the stairwell. This
would then mean that the stairs would be blocked as escape or evacuation route.
Using the essential service mode function, the ventilation switches over to the control of an
overpressure. The essential service mode prevents the propagation of flue gas in the stairwell,
thereby keeping the stairs free as an evacuation route as long as possible.
Special features of essential service mode
Activating and terminating essential service mode
Signal p3880 = 1 activates the essential service mode:
● If the motor was switched off by activating essential service mode, the inverter switches
the motor on.
● If the motor was switched on by activating essential service mode, the inverter switches
the speed setpoint to "ESM setpoint source".
Signal p3880 = 0 deactivates the essential service mode:
● If one of the OFF1, OFF2 or OFF3 commands is active, the inverter switches off the motor.
● If neither OFF1, OFF2 nor OFF3 is active, the inverter switches the speed setpoint from
the "ESM setpoint source" to the normal setpoint source.
Switch the motor on and off during active essential service mode via other signals
The OFF1, OFF2 and OFF3 commands for switching off the motor have no effect.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Advanced commissioning
6.11 Essential service mode
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