Siemens SINAMICS V20 Operating Instructions Manual page 309

Parameter Function
By default the motor states are controlled from digital outputs.
In the text below, the following terminology will be used:
MV - Variable speed (Converter controlled motor)
M1 - Motor switched with digital output 1
M2 - Motor switched with digital output 2
Staging: The process of starting one of the fixed speed motors.
De-staging: The process of stopping one of the fixed speed motors.
When the converter is running at maximum frequency, and the PID feedback indicates that a higher speed
is required, the converter switches on (stages) one of the digital output controlled motors M1 and M2.
At the same time, to keep the controlled variable as constant as possible, the converter must ramp down
to minimum frequency.
Therefore, during the staging process, PID control must be suspended (see P2378 and diagram below)
When the converter is running at minimum frequency, and the PID feedback indicates that a lower speed
is required, the converter switches off (de-stages) one of the digital output controlled motors M1 and M2.
In this case, the converter must ramp from minimum frequency to maximum frequency outside of PID
control (see P2378 and diagram below).
P2372[0...2] Motor staging cycling
Enables motor cycling for the motor staging feature.
When enabled, the motor selected for staging/destaging is based on the hours run counter P2380. When
staging, the motor with the least hours is switched on. When destaging, the motor with most hours is
switched off.
If staged motors are different sizes the choice of motor is first based on required motor size, and then if
there is still a choice, on hours run.
0
1
P2373[0...2] Motor staging hysteresis [%]
P2373 as a percentage of PID setpoint that PID error r2273 must be exceeded before staging delay
starts.
Note: The value of this parameter must always be smaller than delay override lockout timer P2377.
P2374[0...2] Motor staging delay [s]
Time that PID error r2273 must exceed motor staging hysteresis P2373 before staging occurs.
P2375[0...2] Motor destaging delay [s]
Time that PID error r2273 must exceed motor staging hysteresis P2373 before destaging occurs.
SINAMICS V20 Converter
Operating Instructions, 10/2019, A5E34559884-012
Range Factory
default
0 - 1 0
Disabled
Enabled
0.0 - 200.0 20.0
0 - 650 30
0 - 650 30
Can be Scaling Data
changed set
T - DDS
U, T PERCENT DDS
U, T - DDS
U, T - DDS
Parameter list
8.2 Parameter list
Data Acc.
type Level
U16 3
Float 3
U16 3
U16 3
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