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Chapter 1 Safety Instructions
Chapter 1 Safety Instructions
Inverter
G
Proper
grounding
method
Inverter
G
Inverter
G
Grounding bus bar
(Connect to the ground at the shared point)
CAUTION
Figure 1-1
FORBIDDEN
DO NOT connect control terminals (except terminals mar ked
"TA", "TB" and "TC") to AC 220V power supply, which
may cause damage to the inverter.
DO NOT connect AC power supply to the output terminals
marked "U", "V" and "W". Otherwise, it may cause damage
to the inverter, as shown in the Figure 1-2.
It is not suitable to install an electromagnetic contactor in the
side of output power supply, because the operation of open
and close to the contactor when the motor is running may
cause damage to the inverter arising from over-voltage
produced during this process. But it is still necessary to install
a contactor if one of the following three points occurs:
1. The system of frequency converting governor used to control
energy-saving usually works at a rated rotation speed. To run the
governor economically, there is a must to remove the inverter.
2. The inverter participates in some import procedure and cannot
stop operating for a long period of time. To realize free shift
in various control systems and improve the reliability of these
systems, there is a must to install a contactor.
3. When an inverter controls several motors, there is a must to
install a contactor.
Caution: DO NOT operate the contactor if there is output of the
inverter.
1.5 Cautions for Operation
FORBIDDEN
Three-phase
AC
Power Supply
R
S
T
U
INVERTER V
W
Figure 1-2
COMPULSORY
DO install a no-fuse circuit breaker or leakage protective
circuit breaker in the side of inverter input power supply
to prevent expanding of accident due to an inverter problem.
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HAZARD
Do not operate electrical equipment with wet hands.
An inverter stored for more than half a year should be given
power up test before use so that the main circuit filter capacitor
could be recovered. When the inverter is in the state of powerup,
it is necessary to raise the voltage gradually to the rated value
with a voltage regulator. Generally, the charging time should
be controlled within 2 hours. Otherwise, there is the danger
of electric shock or exposure.
Do not touch the inner side of the inverter while the po wer
is ON, nor put any foreign matter, i.e., rod or other matter
inside the inverter. Otherwise, it may result in serious damage
to the equipment or electric shock.
Do not open the front cover while the inverter is powered
ON. Otherwise, there is the danger of electric shock.
Be careful to select the Restart Mode. Otherwise, there is
the danger of personnel death.
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