Q-Drive Installation Manual
Issue 1.5
Page 56
Copyright © 1996 Quin Systems Ltd.
9.4
Encoder Simulator
The operation of the encoder simulator can be checked using a control system such as
a Quin Systems PTS unit. Connect the encoder output of the drive to the encoder input
on a PTS system and switch on both the drive and PTS system. Using a terminal
connected to the PTS type the command
“DM”
and then turn the shaft of the motor.
Whilst monitoring the second column of data turn the shaft in one direction, this should
produce positional data climbing in a positive or negative direction, turning the shaft in
the opposite direction should take the data back to zero and then climbing in the
opposite direction.
If the encoder position counts up and down by only one count, then one of the two
phases of the encoder signals is not being detected. If the encoder position value does
not change at all, then either or both phase signals are missing. If the position tends to
count either up or down whichever direction the shaft is turned, then the track A and B
signals are mixed up with their complementary signals, such that instead of the system
receiving two signals in quadrature, it always receives two signals in opposite phase
regardless of the shaft direction. These problems can be confirmed by monitoring the
encoder signals with an oscilloscope.
