IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 49
3.3 Wiring the Encoder Circuit
A shaft-mounted encoder is required to provide speed and shaft position feedback to the IMPULSE
®
•VG+ Series
4. Without an encoder, flux vector control cannot operate properly.
Before you wire the encoder circuit, refer to Table 3-10 on page 50, Table 3-11 on page 50 and Section 3.2 on
page 33.
3.3.1 Encoder Circuit Wiring Procedures
Table 3-9: Encoder Specifications
To wire the encoder circuit for IMPULSE
®
•VG+ Series 4 (assuming the cover and keypad are detached):
1. Direct-couple the encoder to the motor shaft, using a zero-backlash-type coupling.
NOTE: Do not connect the encoder to the motor with roller chain or gear drive. If unable to direct-couple the
encoder, use a timing belt to drive the encoder. (Contact Magnetek for encoder kits.) Also, do not connect
the encoder to the low-speed shaft of a speed reducer.
2. Connect the encoder to the PG-X3 Encoder Option Card. See Figure 3-17 on page 50.
NOTE: Use twisted-pair, shielded cable 100 Ω impedance (Magnetek R-20/6, R-22/6, Belden 9730, or Brand Rex
T-11651). Strip the encoder wires 0.25 in. (5.5 mm). Keep the wiring length less than 300 feet (for cable
lengths greater than 300 feet, contact Magnetek for information on available fiber optic cable).
3. Ground the shielded cable to Terminal FE of the PG-X3 Option Card (ground only one end of the shielded
cable).
NOTE: Typically, the shield connection is not considered “Ground.” The shield should be grounded.
4. Whenever possible, the encoder cable should be wired in a continuous run between the motor and VFD. If it
cannot be a direct run, the splice should be in its own junction box and isolated from the power wires.
Power supply +12 VDC (+5 VDC by CN3 jumper); max. 200 mA
(consult factory if inrush currents exceed 200 mA), an auxiliary power supply is required
Output Type Differential Quadrature (A+, A-, B+, and B- channels; Z is not required)
Compatible Types Line Driver (TTL/RS422)
Push-Pull (HTL)
Open Collector (PNP or NPN)
Non-Compatible Types Resolver
Absolute (sine/cosine)
Maximum Input
Frequency
300 kHz
Mounting method Encoder must be direct-coupled to motor shaft, using a zero-backlash-type coupling.
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