Operating Instructions

Chapter 6 – Programming
Siemens Building Technologies, Inc. 63
Parameter Settings for Motor Staging (Commissioning)
In general, the factory settings can be used.
P2371, Selection of external motor configuration
Max. 2 pumps can be added. Possible settings:
0 = Motor staging disabled (factory default)
1 = M1=1X, M2= , M3=
2 = M1=1X, M2=1X, M3=
3 = M1=1X, M2=2X, M3=
4 = M1=1X, M2=1X, M3=1X
5 = M1=1X, M2=1X, M3=2X
6 = M1=1X, M2=2X, M3=3X
7 = M1=1X, M2=1X, M3=3X
8 = M1=1X, M2=2X, M3=3X
P2372, Enable motor cycling
If this parameter is enabled, one or two motors are switched on or off (during staging, in
addition to the speed-controlled motor) in a specified sequence based on the motor operating
hours (Parameter 2380, Motor hours run).
During staging, the motor having the lowest number of operating hours is first switched on.
During destaging, the motor having the highest number of operating hours is first switched
off.
If staged motors are different sizes, the motor size promising to best satisfy the demanded
output is switched on first, regardless of its operating hours, and then the motor based on run
hours.
Factory setting: 0 (disabled).
P2373, Motor staging hysteresis
Error, as a percentage of setpoint, which must be exceeded before staging delay starts.
Setting range: 0 to 200%
Factory setting: 20%
P2374, Delay on motor staging
Time that error (P2373) must exceed hysteresis before staging occurs.
Setting range: 0 to 650 seconds
Factory setting: 30 seconds