Essential Service Mode - Siemens SINAMICS G150 Operating Instructions Manual

Functions, monitoring, and protective functions
9.2 Drive functions
9.2.22

Essential service mode

Description
Essential Service Mode (ESM) enables the drive to be operated for as long as possible if
needed, even when errors occur.
For instance, this function can be used in applications in which an undesirable standstill can
cause significant subsequent damage.
For example, if a fire breaks out in a large building, a fan should extract smoke and other
gases so that people can be evacuated.
Features
● In essential service mode, the automatic restart function is activated irrespective of the
setting of parameter p1210. The result of this is that the drive is automatically switched
back on if an OFF2 occurs due to an internal fault.
● In essential service mode, converter shutdown due to faults is suppressed. Exceptions to
this rule are faults that would lead to the destruction of the device.
● Essential service mode is triggered by a continuous signal via the digital input, which is
set as a signal source via p3880.
● If the drive is in bypass mode when essential service mode is activated, the motor will
automatically switch over to converter operation. In this case, there is no back
synchronization to the converter, i.e. the "Flying restart" function must be activated
(p1200 = 1).
● When essential service mode ends, the converter returns to normal operation and
responds according to the currently pending commands and setpoints.
Note
Loss of warranty for an converter operated in the essential service mode
Should essential service mode apply, the customer can no longer lodge any claims for
warranty.
The essential service mode is an exceptional state, and is not suitable for continuous
operation.
The essential service mode can have the following effects:
• Exceptionally high temperatures inside and outside the converter
• Open fire inside and outside the converter
• Emissions of light, noise, particles, gases.
The converter logs the essential service mode, and the faults that occur while in essential
service mode in a password-protected memory. This data is only accessible for the service
and repair organization.
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Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A