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
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