Input Phase Failure Protection - Hitachi J300 Series Instruction Manual

External or remote over load protection required, if multiple motors to
be connected.
For models J300-450LFU and -550LFU only , connect to branch
circuit protected at maximum 300% of output current rating.
Suitable for use on a circuit capable of delivering not more than 10,000
rms symmetrical amperes,*** volts maximum,
(where *** = input voltage)
Alarm connection may contain harzordous live voltage even when
inverter is disconnected. In case of removing front cover for
maintenance or inspection, confirm that incoming power for alarm
connection is surely disconnected.

Input phase failure protection

(1) J300-U version inverter are provided with the phase failure protection on the power
supply.
(2) When a buzzer, lamp, noise filter or transformer is connected between the input power
terminals (L1, L2, L3) and input power fuses, input phase failure cannot be protected.
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CAUTION
CAUTION
(L1) (L2) (L3)
R S T
L
Noise filter
Fuse
L
Power supply
1-3
............ p. 5-4
............ p. 5-11
(Bad example)
(Good example)