Siemens SINUMERIK 840C - Manual (Page 569)

7 Drive Machine Data (SIMODRIVE Drive MD) 04.96
7.3.2 Drive MD (data description)
Ratio V/f during V/f mode (SW 4.4 only) 1661
Default value Lower input limit Upper input limit Units
2.4 0.0 100.0 V/Hz
Active
at once
Input of a voltage/frequency ratio value for the drive in voltage-controlled V/F operation.
The following applies to the V
q
voltage applied to the drive:
U
q
= MD 1661 x MD 1660
Note:
• This machine data has a diagnostic function and may only be used or applied by trained
service personnel.
Change motor frequency V/F range (SW 4.4 only) 1662
Default value Lower input limit Upper input limit Units
5.0 0.0 10 000.0 Hz/s
Active
at once
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.
•
Op. time factor IPO/NREG cyc. f. RFG (SW 4.4 only) 1665
Default value Lower input limit Upper input limit Units
2.0 0.0 20.0 –
Active
at once
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 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)