Siemens SINUMERIK 840C Installation Instructions Manual page 569

7 Drive Machine Data (SIMODRIVE Drive MD)
7.3.2 Drive MD (data description)
1661
Default value
2.4
Input of a voltage/frequency ratio value for the drive in voltage-controlled V/F operation.
The following applies to the V
U = MD 1661 x MD 1660
q
Note:
• This machine data has a diagnostic function and may only be used or applied by trained
service personnel.
1662
Change motor frequency V/F range (SW 4.4 only)
Default value
5.0
Input of a change in the motor frequency for V/F operation via frequency increment for the V/F
ramp-up control to the electrical setpoint frequency of the drive.
Note:
• This machine data has a diagnostic function and may only be used or applied by trained
service personnel.
•
1665
Op. time factor IPO/NREG cyc. f. RFG (SW 4.4 only)
Default value
2.0
Note:
This machine data is relevant only for Siemens-internal purposes and must not be altered.
Input of an operating time factor between interpolation and speed controller cycles for the
ramp-function generator.
During ramp-up, the acceleration rate determined by the ramp specification of the SERVO may
be higher than the rate which is actually permissible in the drive, i.e. the drive would continue
to accelerate during relatively rapid reversing operations while the SERVO is already initiating a
braking operation.
The ramp-function generator automatic control is provided to eliminate this problem. This
automatic control ensures that the speed setpoint supplied by the SERVO is linked to the
actual speed value of the 611D by means of a tolerance "± DELTA" in cases where the
specified accelerate rate is too high. The ramp-function generator is then halted by means of
the ZK3 operational message when DELTA (pos. ramp distance = ZK3 bit 7) or - DELTA
(neg. ramp distance = ZK3 bit 6) is applied.
7–154
Ratio V/f during V/f mode (SW 4.4 only)
Lower input limit
0.0
voltage applied to the drive:
q
Lower input limit
0.0
Lower input limit
0.0
©
Siemens AG 1992 All Rights Reserved
Upper input limit
100.0
Upper input limit
10 000.0
Upper input limit
20.0
SINUMERIK 840C (IA)
04.96
Active
at once
Units
V/Hz
Active
at once
Units
Hz/s
Active
at once
Units
–
6FC5197- AA50