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The converter blocks all functions that switch off the motor to save energy, e.g. the hibernation
mode.
Reaction to faults during active essential service mode
In "essential service mode", the converter does not switch off the motor when faults develop,
but rather reacts differently depending on the fault type:
● The converter ignores faults, which do not directly result in the destruction of the converter
or the motor.
● Faults with the reaction "OFF2" switch the motor off immediately.
In this case, the converter attempts to automatically acknowledge the faults using the
automatic restart function.
● For faults that cannot be acknowledged, it is possible to switch over the motor to line
operation using the bypass function.
Automatic restart during active essential service mode
The converter ignores the settings in p1206 (faults without automatic restart) and works with the
setting "restart after a fault with further start attempts" (p1210 = 6).
The converter carries out the maximum number of restart attempts set in p1211 corresponding
to the settings in p1212 and p1213. If the restart attempts are unsuccessful, the converter
reports the fault F07320.
Speed setpoint during active essential service mode
P3881 specifies the setpoint. If you have defined an analog input as setpoint source using
p3881, the converter can switch over to setpoint p3882 in case of wire breakage.
Interaction for bypass and essential service mode
● If, when activating the essential service mode, bypass operation is active, converter
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
converter 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.
Procedure when commissioning
1. Interconnect a free digital input as signal source for the ESM activation.
You must use a negated digital input if the essential service mode should also be active for
a ground fault – or if the control cable is interrupted.
Example for negated digital input DI 3: Set p3880 = 723.3.
It is not permissible to interconnect the digital input for ESM activation with other functions.
2. Set the ESM setpoint source via p3881.
3. Set the alternative ESM setpoint source via p3882.
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Advanced commissioning
6.8 Drive availability
325
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