Operating Instructions

SED2 VFD Operation & Maintenance Manual
168 Siemens Building Technologies, Inc.
P2270 PID feedback function selector
Min: 0 Def: 0 Max: 3
Level 3
Details: Applies mathematical functions to the PID feedback signal, allowing multiplication of the result by P2269 (gain
applied to PID feedback).
Enum: 0=Disabled 1=Square root (root(x)) 2=Square (x*x) 3=Cube (x*x*x)
P2271 PID transducer type
Min: 0 Def: 0 Max: 1
Level 2
Value: 0 : [default] If the feedback signal is less than the PID setpoint, the PID controller will increase motor speed to
correct this.
1 : If the feedback signal is greater than the PID setpoint, the PID controller will reduce motor speed to correct this.
Enum: 0=Disabled 1=Inversion of PID feedback signal
Note: It is essential that you select the correct transducer type.
If you are unsure whether 0 or 1 is applicable, you can determine the correct type as follows:
1. Disable the PID function (P2200=0).
2. Increase the motor frequency while measuring the feedback signal.
3. If the feedback signal increases with an increase in motor frequency, the PID transducer type should be 0.
4. If the feedback signal decreases with an increase in motor frequency the PID transducer type should be set to
1.
r2272 CO: PID scaled feedback
Min: - Def: - Max: -
Level 2
Note: r2272=100% corresponds to 4000 hex.
r2273 CO: PID error
Min: - Def: - Max: -
Level 2
Note: r2273=100% corresponds to 4000 hex.
P2274 PID derivative time
Min: 0 Def: 0 Max: 65535
Level 2
Note: Set PID derivative time
P2279 PID neutral zone
Min: 0.00 Def: 0.00 Max: 100.00
Level 3
Note: Set PID derivative time
P2280 PID proportional gain
Min: 0.000 Def: 3.000 Max: 65.000
Level 2
Details: Allows you to set proportional gain for standard PID controller. For best results, enable both P and I terms.