Q-Drive Installation Manual
Issue 1.5
Page 50
Copyright © 1996 Quin Systems Ltd.
8.4
Determining the motor phases
This operation must only be done when the three-phase motor order is unknown (motor
prototype or no documentation).
It is necessary to have a DC supply of about 3A. and of sufficient voltage to move the
motor but not in excess of the motor rated voltage.
The procedure is as follows:
1
Define arbitrarily the Phase U as one of the 3 motor phases.
2
Connect U to “+” and a 2nd phase motor to “-” of the DC supply.
3
Switch supply on. The shaft will move to a stable position.
4
Mark the new shaft position with a pencil, at top dead centre.
5
Disconnect the “-” of the supply from the 2nd phase of the motor and
6
connect the “-” to the 3rd phase motor. Observe the axis rotation direction.
7
Mark with a pencil the new shaft axis position.
With the help of the table below, determine the 2 unknown motor phases.
sense of axis rotation
2nd phase
3rd phase
clockwise
V
W
anti-clockwise
W
V
Table 9: Motor Phase Determination
