Motor Feedback Wiring - Emerson E Series Installation Manual

EN Series Drives Manual

Motor Feedback Wiring

Encoder feedback connections are made with the CFCS cable. This cable has
an MS style connector on the motor end and a 26 pin high density D connector
on the drive end.
For A, A, B, B and Z, Z pairs, the CFCS cable uses low capacitance (-10 pf/ft)
wire to get a characteristic impedance of 120 ohms. This impedance match is
important to minimize signal loss and ringing.
M o t o r F r o l F e e d b a c k C o n -recto
( B e n d i x P T 0 6 6
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C o n n e c t o r S t e l
The - 1 5 V D C " ( 1 8 AW G ) w i r e w i l l b e c o l o r e d
" R e d / G r e e n - o n s o m e C F C S c a b l e s .
Figure 21 M o t o r Feedback Connector Pin-Out
Note: F o r non-Emerson motors the thermal switch minimum requirements
are as follows:
Operation = Open on rise
V(min) = 10VDC
I(min) = 1 mA
If a thermistor is used, the motor fault will occur when the thermistor
resistance is approximately 1.0 k ohm.
28
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