3
VFD-B Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
3-17
10. Make sure that the power source is capable of supplying the correct voltage and
required current to the AC drive.
11. Do not attach or remove wiring when power is applied to the AC drive.
12. Do not monitor the signals on the circuit board while the AC drive is in operation.
13. For the single-phase rated AC drives, the AC power can be connected to any two of the
three input terminals R/L1, S/L2, T/L3.
Note: This drive is not intended for the use
with single-phase motors.
14. Route the power and control wires separately, or at 90
°
angle to each other.
15. If a filter is required for reducing EMI (Electro Magnetic Interference), install it as close
as possible to AC drive. EMI can also be reduced by lowering the Carrier Frequency.
16. If the AC drive is installed in the place where a load reactor is needed, install the filter
close to U/T1, V/T2, W/T3, side of AC drive. Do not use a Capacitor or L-C Filter
(Inductance-Capacitance) or R-C Filter (Resistance-Capacitance), unless approved by
Delta.
17. When using a GFCI (Ground Fault Circuit Interrupt), select current sensor with sensitivity
of 200mA, and not less than 0.1-second detection to avoid nuisance tripping.
3.7 Motor Operation Precautions
1. When using the AC drive to operate a standard 3-phase induction motor, notice that the
energy loss is greater than for an inverter duty motor.
2. Avoid running a standard induction motor at low speed. Under these conditions, the
motor temperature may rise above the motor rating due to limited airflow produced by
the motor’s fan.
3. When the standard motor operates at low speed, the output load must be decreased.
4. If 100% output torque is desired at low speed, it may be necessary to use a special
“inverter-duty” rated motor.
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