Siemens SED2 series Operating Instructions Manual page 102
Variable speed drives
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- Operating instructions manual (40 pages)
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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
Displays PID scaled feedback signal in [%].
Unit: %
Min: -
Note:
r2272=100 % corresponds to 4000 hex.
r2273
CO: PID error
Displays PID error (difference) signal between setpoint and feedback signals in [%].
Unit: %
Min: -
Note:
r2273=100 % corresponds to 4000 hex.
P2274
PID derivative time
Sets PID derivative time.
Unit: s
Min: 0
Note:
Set PID derivative time
P2279
PID Neutral zone
Sets PID derivative time.
Unit: %
Min: 0.00
Note:
Set PID derivative time
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
Details:
Allows user to set proportional gain for standard PID controller. For best results, enable both P and I terms.
Dependency:
If P term=0, I term acts on the square of the error signal.
Note:
If the system is prone to sudden step changes in the feedback signal, P term should normally be set to a small value
(0.5) with a faster I term for optimum performance.
The D term (P2274) multiplies the difference between the present and previous feedback signal thus accelerating the
controller reaction to an error that appears suddenly.
The D term 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 time constant for PID controller.
Unit: s
Min: 0.000
Note:
See P2280 (PID proportional gain).
P2291
PID output upper limit
Sets the upper limit for PID controller output in [%].
Unit: %
Min: 0.00
Dependency:
If F max (P1082) is greater than P2000 (reference frequency), either P2000 or P2291 (PID output upper limit) must be
changed to achieve F max.
Note:
P2291=100 % corresponds to 4000 hex (as defined by P2000 [reference frequency] ).
P2292
PID output lower limit
Sets the lower limit for the PID controller output in [%].
Unit: %
Min: -0.00
Dependency:
A negative value allows bipolar operation of PID controller.
Note:
P2292=100 % corresponds to 4000 hex.
P2293
Ramp-up /-down time of PID limit
Sets maximum ramp rate on output of PID.
When PI is enabled, the output limits are ramped up from 0 to the limits set in P2291 (PID
output upper
limit) and P2292 (PID output lower limit). Limits prevent large step changes appearing on the
output of the PID when the variable speed drive is started. Once the limits have been reached,
the PID controller output is instantaneous.
These ramp times are used whenever a RUN command is issued.
Unit: s
Min: 0.00
Note:
If an OFF1 or OFF3 are issued, the variable speed drive output frequency ramps down as set in P1121
(ramp-down time) or P1135 (OFF3 ramp-down time).
r2294
CO: Act. PID output
Displays the PID output in [%].
Unit: %
Min: -
Details
When PI is enabled, the output limits are ramped up from 0 to the limits set in P2291 (PID output upper limit) and P2292
(PID output lower limit). Limits prevent large step changes appearing on the output of the PID when the variable speed
drive is started. Once the limits have been reached, the PID controller output is instantaneous.
These ramp times are used whenever a RUN command is issued.
Note:
r2294=100 % corresponds to 4000 hex.
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Def: 1.200
Def: 30
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SED2 variable speed drives
Programming
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Max: 65535
Max: 100.00
Max: 65.000
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Max: 100.00
Max: 100.00
Max: 100.00
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