Siemens SINAMICS G120XA, Operating Instructions Manual

Page: 340 / 918

6.9.3 Hibernation mode
The hibernation mode saves energy, reduces mechanical wear and noise.
Pressure and temperature controls involving pumps and fans are typical applications for the
hibernation mode.
Function
If the plant/system conditions permit it, the converter switches off the motor and switches it on
again when there is a demand from the process.
The hibernation mode starts as soon as the motor speed drops below the hibernation mode
start speed. The converter switches off the motor after an adjustable time. If, during this time,
the speed setpoint increases above the hibernation mode start speed due to pressure or
temperature changes, the converter exits the hibernation mode.
In the hibernation mode the motor is switched off, but the converter continues to monitor the
speed setpoint or technology controller deviation.
● For an external setpoint input (without technology controller), the converter monitors the
speed setpoint and switches on the motor again as soon as the setpoint increases above the
restart speed.
In the factory setting, the converter monitors the positive speed setpoint. The converter
switches on the motor as soon as the setpoint exceeds the restart speed.
If you also want to monitor the negative speed setpoint, you have to monitor the setpoint
amount. To do this, set p1110 = 0.
● When the setpoint is input from the technology controller, the converter monitors the
technology controller deviation (r2273) and switches on the motor again if the deviation of
the technology controller exceeds the hibernation mode restart value (p2392).
In the factory setting, the converter monitors the positive deviation of the technology
controller. The converter switches on the motor as soon as the technology controller
deviation is higher than the hibernation mode restart value (p2392).
You must monitor the absolute value of the deviation to switch on the motor again for a
negative technology controller deviation.
Set p2298 = 2292 and set the minimum threshold in p2292.
Note
Hibernation mode after switching on the converter
After switching the converter on, a wait time starts in the converter. The longest wait time is at
the following times:
● p1120 (ramp-up time)
● p2391 (hibernation mode delay time)
● 20 s
If the motor does not reach the hibernation mode start speed within this wait time, the converter
activates the hibernation mode and switches off the motor.
If you want to prevent frequent activation and deactivation, before deactivation you still have to
set a short speed boost. The boost is deactivated with p2394 = 0.
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Advanced commissioning
6.9 Energy saving
SINAMICS G120XA converter
338
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB