HP Anab EQ5 - Manual (Page 18)

EQ5 AC Drive Operations Manual
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TECO – Westinghouse Motor Company Power Terminal Designations & Wiring 12
2. Inverter output terminals (U, V, W)
a. Connect these terminals to a 3-phase motor in the correct phase sequence. If the
direction of motor rotation is incorrect, swap any two of the U, V, and W phases.
b. Do not connect a power factor correction capacitor or surge suppressor to the inverter
output.
c. If the cable from the inverter to the motor is excessively long, a high-frequency current
can be generated by stray capacitance between the cables and result in an overcurrent
trip of the inverter, an increase in leakage current, or a reduction in current indication
precision.
d. When a motor is driven by a PWM-type inverter, the motor terminals may be subject to
surge voltage generated by PWM switching. If the motor cables are excessively long,
particularly the 460V series units, the surge voltage will deteriorate motor insulation
over time. To prevent this, use the following guidelines:
Inverters 7.5HP/CT, 10HP/VT and Higher
Motor Insulation Rating 1000V 1300V 1600V
460 VAC Input Voltage 66 ft (20 m) 328 ft (100 m) 1312 ft (400 m) *
230 VAC Input Voltage 1312 ft (400 m) * 1312 ft (400 m) * 1312 ft (400 m) *
Inverters 5HP/CT/VT and Smaller
Motor Insulation Rating 1000V 1300V 1600V
460 VAC Input Voltage 66 ft (20 m) 165 ft (50 m) * 165 ft (50 m) *
230 VAC Input Voltage 328 ft (100 m) * 328 ft (100 m) * 328 ft (100 m) *
* In this case the cable length is determined by secondary effects and not voltage
spiking.
Note: When a motor protective thermal O/L relay is inserted between the inverter and the motor, the
thermal O/L relay may malfunction (particularly in the 460V series units), even when the cable length
is 165 feet (50m) or less. To correct this, insert a filter or reduce the PWM carrier frequency. (Use
function code “F26 Motor sound”.)
3. Auxiliary control-power input terminals (R0 and T0)
The inverter will operate even if power
is not provided to these terminals. If a
protective circuit is activated and the
magnetic contactor on the inverter
power input side is opened (off), the
inverter control circuit power, the alarm
output (30A, B, and C), and the keypad
display will lose power. To prevent this,
the same AC power as supplied to the
main input circuit must be supplied (as
auxiliary control power) to the auxiliary
control - power input terminals (R0 and
T0). (see Fig. 2-3-2)
a. To ensure effective noise reduction
when using an input noise filter, the
output from the filter must go to
the auxiliary control-power input
terminals. If these terminals are
Fig. 2-3-2 Connecting the Auxiliary Control-Power
Input Terminals
connected to the input side of the filter, the noise reduction is much less effective.