Moog MSD Servo Drive Series

7.9V/Hzmode
A simple function test can be carried out in V/f mode. This test will show users
whether a motor is connected correctly and whether the right direction of movement
will be followed. If ...
 Thedirectionofmovementisthewrongone,
 Themotorisatastandstill,
 Uncontrollablemotionoccurs,
then the connection and the motor data need to be checked.
For testing purposes, a V/f control system is implemented in such a way that the
closed-loop speed control circuit will be replaced by the V/f control. The reference is
the speed reference; the actual speed is set equal to the reference. A linear
characteristic with two nodes has been implemented, with a fixed boost voltage
setting P313[0] - CON_VFC_VBoost at 0 Hertz. Starting from the rated frequency
P314[0] - CON_VFC_FNom, the output voltage will remain constant at P315[0] -
CON_VFC_VNom. This means that an asynchronous motor will automatically be
driven to field weakening as the frequency rises.
Fig. 7.40: “V/f mode” dialog box
ID Index Name Unit Description
313 0 CON_VFC_VBoost V V/fcharacteristic:Boostvoltage
314 0 CON_VFC_FNom Hz V/fcharacteristic:Ratedfrequency
315 0 CON_VFC_VNom V V/fcharacteristic:Nominalvoltage
Table 7.30: “V/f mode” parameters
MOOG
ID
No.: CB40859-001 Date: 02/2018
MSD Servo Drive- Device Help
153
7 Control
ID Index Name Unit Description
19 0 epsRS Polewidth Rotor/statorelectricalangle
20 0 freqRS Hz Rotor/statorelectricalfrequency
21 0 freqFS Hz Field/statorelectricalfrequency
29 0 vmot V Currentmotorvoltage
312 0 CON_CCON_VMot V Currentmotorvoltage(rms,phase-to-phase)
Table 7.31: Scope signals “V/Hz mode (basic)”