Appendix A
Chapter 7
D Gearmotor
The speed range for continuous operation differs according to the lubrication method
and motor manufacturer. In particular, continuous operation of an oil-lubricated motor in
the low speed range may result in burning. If the motor is to be operated at a speed high-
er than 60 Hz, consult with the manufacturer.
D Synchronous Motor
This motor is not suitable for Inverter control. If a group of synchronous motors is individ-
ually turned on and off, synchronism may be lost.
D Single-phase Motor
This motor is not suitable for Inverter control. It should be replaced with a three-phase
motor.
H Power Transmission Mechanism (Speed Reducers, Belts,
Chains, and so on)
If an oil-lubricated gearbox or speed reducer is used in the power transmission mecha-
nism, note that oil lubrication will be affected when the motor operates only in the low
speed range. Note also that the power transmission mechanism will make noise and
experience problems with service life and durability if the motor is operated at a speed
higher than 60 Hz.
7-2 Frequency Reference by Amperage Input
Frequency references can be input in terms of amperage (4 to 20 mA) by
changing the setting of the DIP switch inside the Inverter.
H Using the DIP Switch
1. Changing constant settings
Before using the DIP switch, always set “4” or “5” in constant no. 02 (operation mode
selection).
Note n02 = 4: Run commands are input through the Digital Operator, and frequency
references are input through control terminals.
n02 = 5: Both run commands and frequency references are input through control
terminals.
2. Turning power off
Turn the power off, wait at least one minute after all indicators on the front panel go
off, then perform the following tasks.
7-4
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