3-6
(5) Fasten the power cable to the terminal box with a cable lock so that no tensile load acts on the
motor terminal block.
(6) The position of the terminal box relative to the discharge port can be changed in steps of 90
degrees by rearranging the frame of the motor.
If you rearrange the frame of the motor, ask Teral Inc. about the operating procedures.
Warning
Do not change the orientation of the terminal box.
Failure to observe this may cause the liquid to get into the terminal box,
thus imparting an electric shock.
(7) To prevent the motor from being overloaded and burned out, it is recommended to use a thermal
relay for motor protection.
(8) Carry out adequate dust-proofing and drip-proofing by a connector or gland so that cutting
powder and liquid coolant do not get into the terminal box through the external wiring hole.
(9) Pass the power cable through a metal tube or a metal conduit for shielding, and connect a
ground wire to the outer surface of the tube.
(10) Limit the fluctuations of the power voltage within ±10% of the rated voltage, and also limit the
fluctuations of the frequency within -5% to +3% of the rated value. Although you can run the
pump in these ranges, avoid continuous operation if the voltage is not within the range of ±5% of
the rated value or if the frequency is not within the range of ±2% of the rated value. Failure to
observe this may cause the pump to be overloaded, resulting in motor breakage or a fire.
Even if the power fluctuations fall within the allowable ranges, the pump characteristics, motor
characteristics, and the temperature rise of the motor may differ from those at the rated voltage
and frequency.
(11) Precautions for using the inverter drive
• Ensure that the operation current value does not exceed 90% of the rated value.
• Ensure that the minimum frequency is set to 20 Hz.
(Contact us for operation at 20 Hz or below.)
• Contact to the nearest Teral office when using a 400V class model. Protective measures may be
required against the inverter surge.
• An inverter-driven motor generates a magnetic sound which may sound more annoying than
those generated by the drives using unconverted commercial power.
• Although this magnetic sound does not cause an adverse effect on the quality of the motor,
some inverters allow the user to adjust the tone by changing the carrier frequency. However,
changing the frequency may reduce the allowable output of the inverter. Pay particular attention
when selecting the inverter.
• Do not use in such a rotating speed range that the pump and motor vibrate sympathetically
during normal operation.
Caution
Do not allow the pump to operate with a frequency beyond 60 Hz.
Doing so may overload the motor, causing it to burn out.
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