Hibernation Mode - Siemens SINAMICS G120 Operating Instructions Manual

6.37

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 inverter 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 inverter 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 inverter exits the hibernation mode.
In the hibernation mode the motor is switched off, but the inverter continues to monitor the
speed setpoint or technology controller deviation.
● For an external setpoint input (without technology controller), the inverter 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 inverter monitors the positive speed setpoint. The inverter 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.
Additional setting options are described in the List Manual, in function diagrams 3030 and 3040
as well as in the associated parameter descriptions.
● When the setpoint is input from the technology controller, the inverter 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 inverter monitors the positive deviation of the technology
controller. The inverter 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 inverter
After switching the inverter on, a wait time starts in the inverter. 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 inverter
activates the hibernation mode and switches off the motor.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Advanced commissioning
6.37 Hibernation mode
357