7
7.5 V/Hz operation (diagnostics function)
7-729
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
For V/Hz operation with synchronous motors, the following parameters
are available:
Table 7-9 Parameter V/Hz operation with 1FK6/1FT6 motors (SRM)
Parameters
Name
P1014 Activates V/Hz operation
P1104 Maximum motor current
P1105 Reduced maximum motor current
P1112 Motor pole pair number
P1114 Voltage constant
P1125 Ramp–up time 1 for V/Hz operation
P1400 Rated motor speed
P1401 Speed for the max. useful motor speed
P1405 Monitoring speed, motor
The speed setpoint conversion into the frequency to be used as refe-
rence is obtained from the pole pair number.
~430 V
P1114
U [V]
P1112 x
1000
60
f [1/s]
Fig. 7-13 V/Hz characteristic SRM
Generally, only speeds up to approx. 25% of the rated speed can be
reached due to the strong tendency for synchronous motors to oscillate
in the V/Hz mode.
The ramp–up time can be set via P1125.
Parameters for
V/Hz operation
with synchronous
motors (SRM)
V/Hz characteristic
SRM
Ramp–up times
7 Fault Handling/Diagnostics
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