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Siemens Building Technologies SED2 variable speed drives CM1U5192en
HVAC Products Programming 01.2002
P2303[2] CI: PID o/p offset
Selects the source of the PID output offset signal.
Unit: - Min: 0:0 Def: 0:0 Max: 4000:0
Level 3
Settings:
755 = Analog input 1 setpoint 2224 = Fixed PID setpoint 2250 = Output setpoint of PID-MOP
Index:
P2303[0] : 1st command data set (CDS) P2303[1] : 2nd command data set (CDS
Note:
When analog input is selected, offset and gain can be implemented using parameters P0756 to P0760 (ADC scaling).
P2304 PID opening time
Sets actuator opening time constant for PID controller.
Unit: s Min: 0 Def: 60 Max: 65535
Level 2
Details:
See P2304 (PID actuator closing time).
P2305 PID closing time
Sets actuator opening time constant for PID controller.
Unit: s Min: 0 Def: 60 Max: 65535
Level 2
Details:
See P2304 (PID actuator closing time).
P2306 PID Acting Dir
Direct = 0 = increasing plant output causes increasing controller output Indirect = 1 =increasing
plant output causes decreasing controller output.
Unit: - Min: 0 Def: 1 Max: 1
Level 2
Settings:
0 Indirect Acting (Cooling Sequence)
1 Direct Acting (Heating Sequence)
P2370 Motor staging stop mode
Selects stop mode for external motors when motor staging is in use.
Unit: - Min: 0 Def: 0 Max: 1
Level 3
Settings:
0=Normal stop 1=Sequence stop
P2371 Selection motor configuration
Selects configuration of external motors used for motor staging feature.
Unit: - Min: 0 Def: 0 Max: 8
Level 3
Settings:
0=Motor staging Disabled
1=M1=1X, M2=
2=M1=1X, M2=1X
3=M1=1X, M2=2X
Details
Motor staging allows the control of up to 2 additional staged pumps or fans, based on a PID control system. The
complete system consists of one pump controlled by the variable speed drive with up to 2 further pumps / fans controlled
from contactors or motor starters. The contactors or motor starter are controlled by outputs from the variable speed
drive. The diagram below shows a typical pumping system. A similar system could be set up using fans and air ducts,
instead of pumps and pipes.
P2372 Enable motor 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.
Unit: - Min: 0 Def: 0 Max: 1
Level 3
Settings:
0=Disabled 1=Enabled
P2373 Motor staging hysteresis
P2373 as a percentage of the PID setpoint that PID error P2294 must exceed before the
staging delay starts.
Unit: % Min: 0.0 Def: 20.0 Max: 200.0
Level 3
Details:
Error as a percentage of setpoint that must be exceeded before staging delay starts.
P2374 Motor staging delay
Time that PID error P2273 must exceed motor staging hysteresis P2373 before staging occurs.
Unit: s Min: 0 Def: 30 Max: 650
Level 3
Details:
Time that error must exceed hysteresis before staging occurs.
P2375 Motor destaging delay
Time that PID error P2273 must exceed motor staging hysteresis P2373 before destaging
occurs.
Unit: s Min: 0 Def: 30 Max: 650
Level 3
Details:
Time that error must exceed hysteresis before destaging occurs.
P2376 Delay override
P2376 as a percentage of PID setpoint. When the PID error P2273 exceeds this value, a motor
is staged / destaged irrespective of the delay timers.
Unit: % Min: 0.0 Def: 25.0 Max: 200.0
Level 3
Details:
Error as a percentage of setpoint that if exceeded will begin staging without delay.
P2377 Delay override lockout timer
Time for which delay override is prevented after a motor has been staged or destaged.
This prevents a second staging event immediately after a first, being caused by the transient
conditions after the first staging event.
Unit: s Min: 0 Def: 30 Max: 650
Level 3
Details:
Time for which delay override is prevented after a motor has been staged or destaged.
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