7
Application of Encoder (PG), (cont’d)
All signals shown are taken in relation to power supply common, Pin 2 of
the PG-Z2 card.
Complimentary Signal
A complimentary signal includes both a primary signal (A+) and it’s inverse (A-). See
Figure 7. This scheme improves the noise immunity of the feedback because the two
signals are combined in the PG-Z2 providing double the voltage level difference from
low to high signal levels. For example, a +12V encoder has a low voltage level of 0V
and a high voltage level of +24V as measured by the PG-Z2.
The A and B quadrature signals each have their own compliment and if any one of the
four signals is missing, the drive cannot accurately detect encoder (PG) speed or
direction.
+3 to
+12V
Signal A+
Pin 3
0V
Primary Signal
Complement
Quadrature Signal
90°
Complement
0V
Signal A-
Pin 4
+3 to
+12V
0V
Signal B+
Pin 5
+3 to
+12V
0V
Signal B-
Pin 6
+3 to
+12V
Figure 7. Encoder (PG) Signals – Forward Direction (C.C.W.)
- 13 -
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