4
01.99
4.7
Induction motor operation with induction motor
4-142
Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
When the pulses are canceled and in pure induction motor operation,
the drive converter has no information about the actual motor speed.
When the pulses are re–enabled, the speed actual value must first be
searched for.
Parameter P1012.7 can be used to define whether the search should
start at the setpoint speed or at speed = 0.
P1012.7
= 0
Search starts at the setpoint speed
= 1
Search starts at speed = 0
When the motor is stationary and P1012.7 = 0, you should avoid apply-
ing a high setpoint before the pulses have been enabled.
!
Warning
When deleting the gating pulses for the motor (terminal 663, terminal
63 or internally canceling the pulses when faults are present), there is
no motor speed data. The computed speed actual value is then set to
zero. Thus, all of the speed actual value signals, speed actual value
messages and output signals (| n
act
| < n
min
, ramp–function generator
ended, | n
act
| < n
x
, n
set
= n
act
) are no longer reliable.
The IM function allows the control characteristic to be changed over,
online from MSD to IM control (it is not possible to have mixed oper-
ation on MSD and IM control).
The changeover is realized automatically depending on the setting of
the speed threshold in P1465.
n
max
n
max
n
max
P1466
P1465
P1465
P1465
Pure
IM operation:
P1465 = 0
Pure
MSD operation:
P1465 > n
max
Mixed operation:
0 < P1465 < n
max
MSD
MSD––> ARM with encoder signal evaluation
IM ––> ARM without encoder signal evaluation
IM
MSD
IM, open–loop
controlled
IM, closed–loop
controlled
Fig. 4-6
Operating ranges, MSD/IM
Behavior
after
pulse cancellation
MSD/IM operation
4 Commissioning
