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6.4.1. Connecting Power
l
The main power AC line input supplies the power to the high voltage supply for driving the Motor.
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The voltage supplied to the Motor may be three phase or single phase. If the application involves
low speeds less than 0.5 s
-1
, then single phase power will be adequate. If the application requires
high torque and speeds greater than 0.5 s
-1
, then the best Motor torque/speed performance is
obtained by supplying three phase power at a higher voltage.
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The control power AC line input supplies power to the internal low voltage switching power supply
for the logic and signal circuits. The internal switching power supply will operate from any single
phase AC voltage from 90 up to 240 volts.
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The AC power for the control power input may be obtained from the same supply that is connected
to the main power AC line input.
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The AC line power consumption varies with the Motor size, the Driver Unit type and the load. The
Megatorque Motor System requires very little power when it is moving at zero or low speed, even
at maximum torque output. The power consumption is highest when the Motor is producing
significant amounts of torque at elevated speed, more than 20% of the maximum rated speed.
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Use 2.0 mm
2
(14AWG) or larger wire with heat-proof vinyl for power line.
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The electrical noise from outside sources and the System itself may interfere with proper operation.
The protection from electrical noise must be designed into the installation. Use a line noise filter on
the AC supply. A suitable noise filter may be obtained from NSK. If you supply your own, it should
meet the requirements in Table 6-4.
Table 6-4 : Noise Filter Requirement
Driver Unit AC Line
Noise Filter Voltage Rating
Current Rating
220VAC, 3ø
220VAC, 1ø
110VAC, 1ø
250V AC/DC
15A AC/DC
Control Power
250V AC/DC
5A AC/DC
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Do not tie wrap the input and output sides of the AC line filter together, or place them in close
proximity. Do not tie wrap the ground wires with signal wires.
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The noise filter must be installed on control power AC line, separately from the main power line.
Warning : An isolation transformer must also be used to prevent electrical shock.
Contact NSK if you need information about isolation transformers. If you
supply your own, the transformer must have enough capacity for the Motor
power consumption. Refer to “4.2.2. General Specification” for the required
power of the Motor.
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