Siemens Micromaster 420 Operating Instruction page 87

5. SYSTEM PARAMETERS
Parameter
Number
Ramp - up time for
Setpoint
Setpoint Source
P2257
P2253
KK
+
Ramp down time for
Setpoint
P2258
Feedback Source
P2264
KK
Parameter P2253 allows the user to select the source of the PI setpoint. Normally a digital PI setpoint is selected using either a Fixed PI
setpoint or an active setpoint. The most common settings are as follows:
755 = Analog input 1
2224 = Fixed PI setpoint (see P2201 to P2207)
2250 = Active PI setpoint (see P2240)
P2257 Ramp-up time for PI setpoint
Sets the ramp up time for the PI setpoint.
PI Setpoint (%)
100 %
0
Setting the ramp – up time too short may cause the inverter to trip, on overcurrent for
example.
Note.
If PI control is enabled, the normal ramp-up time (P1120) is disabled.
The PI ramp time is only effective on the PI setpoint and only active when the PI setpoint is
changed, or when a RUN command is given (when the PI uses this ramp to reach its value
from 0%).
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
Parameter Name
Setpoint
P2260
y
Maximum
feedback threshold
P2267
x
Minimum
feedback threshold
P2268
P2293
Accel/Decel time of PID limits
Ramp up time
(P2257)
P Gain I Gain
P2280 P2285
Transducer
Type
P2271
Kp Tn
Error
+
P2273
-
PID Output UpperLimit
P2291
PID Output Lower Limit
P2292
time (s)
International English
♦ ♦ ♦ ♦ P0003 User
Min
Access Level
Max
♦ ♦ ♦ ♦ P0004 Setting
[Default]
♦ ♦ ♦ ♦ Changeable
Units
♦ ♦ ♦ ♦ Status
PID in upper limit/lower limit
P53.10/P53.11
y
PID Output
x
r2294
0 2
650 22
[1]
'•'
s
87