Maintenance And Inspection; Others - Hitachi L100-004 HFE Manual

Maintenance and inspection

WARNING Before carrying out maintenance and inspection wait for at least five minutes after
having turned off the input power supply. Otherwise, there is a danger of electric
shock.
WARNING When removing connectors (e.g. from fans and printed circuit boards) never pull the
attached wires. Otherwise, there is a danger of fire due to wire breakage and/or
injury.

Others

CAUTION Withstand voltage tests and insulation resistance tests (megger tests) are executed
before the units are shipped, so that there is no need to conduct these tests before
operation.
CAUTION Do not attach or remove wiring or connectors when power is applied. Also, do not
check signals (e.g. using a multimeter) during operation.
CAUTION Never stop motor operation by switching off the electromagnetic contactors on the
primary or secondary side of the inverter.
Power
supply
WRONG: Start and stop using
primary side contactor
When there has been an instantaneous power failure, and if an operation instruction
has been given, then the inverter may restart operation after the power failure has
ended. If there is a possibibility that such an occurrence may harm humans, then install
an electromagnetic contactor on the primary (power supply) side of the inverter, so
that the circuit does not allow automatic restarting after the power supply has
recoverd. If the optional remote operator is used and the retry function has been
selected, this will also cause automatic restarting when an operation instruction has
been input, so please be careful.
CAUTION Do not insert leading power factor capacitors or surge absorbers between the output
terminals of the inverter and the motor.
Power
supply
CAUTION Be sure to ground the grounding terminal
CAUTION Before inspecting the unit wait at least five minutes before opening the inverter .
CAUTION PROTECTION AGAINST NOISE INTERFERENCE FROM THE INVERTER
L100 series inverters use many semiconductor switching elements such as transistors
and IGBTs. For this reason, a radio set or measuring instrument located near the
inverter is susceptible to noise interference. To protect the instruments from erreneous
operation due to noise interference produced by the inverter, they should be installed
Earth leakage
circuit breaker
S1
Inverter
L1(L1)
L2
L3(N)
Earth leakage
circuit breaker
Inverter
L1(L1)
L2
L3(N)
S2
Motor
T1(U)
T2(V)
T3(W)
WRONG: Start and stop using
secondary side contactor
FW
P24
CORRECT: Start and stop using FW terminal
Motor
T1(U)
T2(V)
T3(W)
WRONG: Capacitor
properly.
1-3
Chapter 1 – Safety precautions
WRONG:
Surge absorber