IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 29
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When using more than one transformer for the VFD's power, properly phase each transformer.
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To reverse the direction of rotation, program B03-04 = 1 (exchange phases), or interchange any two motor
leads (changing R/L1, S/L2, or T/L3 will not affect the shaft rotation direction) as well as encoder phasing
(F01-02 = 1 or swap the A+ and A- wires).
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Use shielded cable for all low-level DC speed reference signals (0 to 10 VDC, 4 to 20 mA). Ground the shield
only at the VFD side.
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Please observe National Electrical Code (NEC) guidelines when wiring electrical devices.
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IMPORTANT: All wire connections must have strain relief, and must not apply downward pressure to the
terminals on the VFD.
NOTE:
Failure to observe these warnings may result in equipment damage.
CAUTION
Do NOT connect external dynamic braking units to VFD braking resistor terminal “B2”. Connect positive
external dynamic braking unit terminal(s) to terminal “+3” and negative external dynamic braking unit
terminal(s) to terminal “-”. When terminal “+3” is unavailable, use terminal “B1”.
