Operating instructions

MM420 Parameter List 04/02
MICROMASTER 420 Parameter List
108 6SE6400-5BA00-0BP0
P2280 PID proportional gain Min: 0.00
CStat: CUT Datatype: Float Unit: - Def: 3.00
P-Group: TECH Active: Immediately QuickComm. No Max: 125.00
Allows user to set proportional gain for PID controller.
The PID controller is implemented using the standard model.
Kp Tn
+
-
PID
setpoint
P2285P2280
PID
feedback
r2294r2273
r2262
r2272
Motor
control
For best results, enable both P and I terms.
Dependency:
P2280 = 0 (P term of PID = 0):
I term acts on the square of the error signal.
P2285 = 0 (I term of PID = 0):
PID controller acts as a P or PD controller respectively.
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.
P2285 PID integral time Min: 0.00
CStat: CUT Datatype: Float Unit: s Def: 0.00
P-Group: TECH Active: Immediately QuickComm. No Max: 100.00
Sets integral time constant for PID controller.
Details:
See P2280 (PID proportional gain).
P2291 PID output upper limit Min: -200.00
CStat: CUT Datatype: Float Unit: % Def: 100.00
P-Group: TECH Active: Immediately QuickComm. No Max: 200.00
Sets upper limit for PID controller output in [%].
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 Min: -200.00
CStat: CUT Datatype: Float Unit: % Def: 0.00
P-Group: TECH Active: Immediately QuickComm. No Max: 200.00
Sets lower limit for the PID controller output in [%].
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 Min: 0.00
CStat: CUT Datatype: Float Unit: s Def: 1.00
P-Group: TECH Active: Immediately QuickComm. No Max: 100.00
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 inverter 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:
If an OFF1 or OFF 3 are issued, the inverter output frequency ramps down as set in P1121 (ramp-down
time) or P1135 (OFF3 ramp-down time).
Level:
2
Level:
2
Level:
2
Level:
2
Level:
3