Siemens Sinamics G120P Operating Instructions Manual page 402

Functions
7.7 Application-specific functions
The inverter 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.
Special features of essential service mode
Priority
The essential service mode has priority over all other inverter functions, e.g. PROFIenergy or
hibernation mode.
Starting and ending the essential service mode
The essential service mode is started via a digital input, and remains active as long as the
signal is available.
If the signal is withdrawn via the digital input, then the inverter reverts to normal operation
and its behavior depends on the pending commands and setpoints.
Automatic restart in the essential service mode
In the essential service mode, the inverter operates with the "Restart after fault with
additional start attempts" setting (p1210 = 6). We recommend that you set the automatic
restart function, also for normal operation, to a value p1210 ≠ 0.
In the essential service mode, the inverter ignores the settings in p1206 (faults without
automatic restart).
The inverter carries out the maximum number of restart attempts set in p1211 corresponding
to the settings in p1212 and p1213. If these attempts are not successful, then the inverter
goes into a fault condition with F07320.
Speed setpoint and direction of rotation in the essential service mode
The essential service mode has its own setpoint source (p3881), and if this source is lost, an
alternative setpoint (p3882).
For the case that it is not possible to define the direction of rotation of the essential service
mode setpoint when configuring the system, then the direction of rotation can be inverted
using a digital input.
If the technology controller is active as setpoint source for the essential service mode
setpoint, then the direction of rotation cannot be changed via the digital input.
Bypass and essential service mode
● If, when activating the essential service mode, bypass operation is active, inverter
operation is selected internally in order to ensure that the setpoint is entered via the
source intended for the essential service mode.
● If faults are still present after the number of start attempts parameterized in p1211, then
the inverter goes into a fault condition with F07320. In this case, there is an option of
switching over to bypass operation and then directly connecting the motor to the line
supply.
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Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A