1042 HEIDENHAIN Technical Manual MANUALplus 620
6.18.14 Volts-per-hertz control mode
In volts-per-hertz control mode (U/f control mode), the motor is speed-
controlled in an open loop. The motor is digitally controlled using HEIDENHAIN
or non-HEIDENHAIN inverter systems.
You can use the following HEIDENHAIN inverters to set up the volts-per-hertz
control mode:
UM 1xx
UE 2xx
UR 2xx
UEC 1xx
You need a control loop to use a motor in volts-per-hertz control mode, and the
appropriate axis or spindle has to be enabled in the SIK. Connect the PWM
output of the CC with the inverter (not required for UEC 11x)—the encoder
inputs remain unconnected.
The motor voltage increases in proportion to frequency up to the break (=
threshold rpm for field weakening). Then the motor voltage remains constant
(= rated voltage of motor); only the frequency continues to increase.
If the spindle reaches the maximum current due to excessive load, the error
message C380 Motor <Spindle 1/2> not controllable appears. For the
maximum current, the value from either the motor table or the power-module
table of the drive (whichever is lower) applies.
The maximum speed in the volts-per-hertz control mode corresponds to the
maximum speed in closed loop operation.
The volts-per-Hertz control mode is a type of digital motor control that does
not return the rotational speed. This control mode cannot be used for axes
controlled through the analog nominal shaft-speed interface (± 10 V
signals).
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