Operating instructions

Issue 10/06 6 Commissioning
MICROMASTER 430
Operating Instructions (Compact)
55
Motor staging cycling
Enables motor cycling for the motor staging feature.
0 Disabled
1 Enabled
When activated (P2372 = 1), then the selection of the motor, that is to be switched-in or
switched-out, depends initially on the operating hours counter P2380. This means:
• When switching-in a motor, the motor with the lowest operating hours, is always
selected, and
• When switching-out a motor, the motor with the highest operating hours, is always
switched-out.
With the same status of the operating hours counter, the motors are switched-in/switched-
out corresponding to the settings in parameter P2371.
Motor staging hysteresis
P2373 as a percentage of PID setpoint that PID error P2273 must be exceeded before
staging delay starts.
Motor staging delay
The staging delay time is set in this parameter.
This means that before an additional motor is switched-in, the system deviation must be
present for at least the set time.
Motor destaging delay
The de-staging delay time is set in this parameter.
This means that before an additional motor can be switched-out, the system deviation must
be present for at least the set time.
Motor staging delay override
If the system deviation exceeds the value set in this parameter, then external motors are
instantaneously (without any delay) switched-in or switched-out.
Motor staging lockout timer
For the time set in this parameter, after switching-in and switching-out external motors, fur-
ther instantaneous switching-in/switching-out is prevented corresponding to that of P2376.
This prevents a second staging event immediately after a first, being caused by the
transient conditions after the first staging event.
Motor staging frequency f_st [%]
The set frequency corresponds to the drive inverter output frequency that is approached,
after the staging / de-staging delay time has expired along the up and down ramps. After
the staging frequency has been reached, the drive inverter controls the relay outputs to
switch-in / switch-out motors M1 - M3.
f
t
P1082
100
2378P
1082P ⋅
%
t
P2373
P2374
P1121
∆
PID
t
r2379
0
1
0
1
0
1
Bit00
Bit01
Bit02
t
y
1121P
100
2378P
1ty ⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−=
f
f ≥ P1082
∆
PID
≥ P2373
t > P2374
a
b
c
a b
Condition for staging:
Staging:
f
set
act
act
0
P2372 = ...
20.0 %
P2373 = ...
30 s
P2374 = ...
30 s
P2375 = ...
25 %
P2376 = ...
30 s
P2377 = ...
50 %
P2378 = ...