Siemens SED2 Commissioning Manual

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Siemens Building Technologies Commissioning Guide CM1G5192en
HVAC Products 10 Parameterization 26.02.2003
P2265 PID feedback filter time constant
Defines time constant for PID feedback filter
Unit: s Min: 0.00 Def: 0.00 Max: 60.00
Level 3
P2267 Max. value for PID feedback
Sets the upper limit for the value of the feedback signal in [%]
Unit: % Min: -200.00 Def: 100.00 Max: 200.00
Level 3
Note:
P2267=100 % corresponds to 4000 hex
When PID is enabled (P2200=1) and the signal rises above this value, the VSD will trip with P0222
P2268 Min. value for PID feedback
Sets lower limit for value of feedback signal in [%]
Unit: % Min: -200.00 Def: 0.00 Max: 200.00
Level 3
Note:
P2268=100 % corresponds to 4000 hex
When PID is enabled (P2200=1) and the signal rises above this value, the VSD will trip with P0221
P2269 Gain applied to PID feedback
Allows the user to scale the PID feedback as a percentage value [%]
A gain of 100 % means that the feedback signal has not changed from its default value
Unit: - Min: 0.00 Def: 100.00 Max: 500.00
Level 3
Note:
Allows the user to scale the PID feedback as a percentage value [%]
A gain of 100.0 % means that feedback signal has not changed from its default value
P2270 PID feedback function selector
Applies mathematical functions to the PID feedback signal, allowing multiplication of the result
by P2269 (gain applied to PID feedback)
Unit: - Min: 0 Def: 0 Max: 3
Level 3
Settings:
0=Disabled 1=Square root (root(x)) 2=Square (x*x) 3=Cube (x*x*x)
P2271 PID transducer type
Allows the user to select the transducer type for the PID feedback signal
Unit: - Min: 0 Def: 0 Max: 1
Level 3
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
Settings:
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 Level 3
Displays PID scaled feedback signal in [%]
Unit: % Min: - Def: - Max: -
Note:
r2272=100 % corresponds to 4000 hex
r2273 CO: PID error
Displays PID error (difference) signal between setpoint and feedback signals in [%]
Unit: % Min: - Def: - Max: -
Level 3
Note:
r2273=100 % corresponds to 4000 hex
P2274 PID derivative time
Sets PID derivative action time
Unit: s Min: 0 Def: 0 Max: 65535
Level 2
P2279 PID Neutral zone
Sets PID derivative action time
Unit: % Min: 0.00 Def: 0.00 Max: 100.00
Level 3
P2280 PID proportional gain
Allows user to set proportional gain for PID controller.
The PID controller is implemented using the standard model
Unit: Min: 0.000 Def: 1.200 Max: 65.000
Level 2
Details:
For best results, enable both P and I parts
Dependency:
If P part=0, I part acts on the square of the error signal
Note:
If the system is prone to sudden step changes in the feedback signal, P part should normally be set to a small value
(0.5) with a faster I part for optimum performance
The D part (P2274) multiplies the difference between the present and the previous feedback signal, thus accelerating the
controller response to an error that appears suddenly
The D part should be used carefully, since it can cause the controller output to fluctuate as every change in the feedback
signal is amplified by the controller derivative action
P2285 PID integral time
Sets integral action time constant for PID controller
Unit: s Min: 0.000 Def: 30 Max: 65535
Level 2
Note:
See P2280 (PID proportional gain)
P2291 PID output upper limit
Sets the upper limit for PID controller output in [%]
Unit: % Min: 0.00 Def: 100.00 Max: 100.00
Level 2

Siemens SED2 Specifications

General

Input Voltage	380-480V AC
Current Rating	Depends on model
Control Type	Digital
Communication	PROFIBUS, PROFINET, Ethernet
Communication Interface	RS485
Protection Features	Overcurrent, overvoltage, undervoltage, overtemperature, short circuit
Operating Temperature	0 to +45 °C
Storage Temperature	+70 °C