2-2
2-3 Connection
When removing the front cover, the terminal blocks appear (see Fig. 2-3-1). Connect the cables without
mistake caring the following items.
2-3-1 Basic connection
① Connect the link circuit connection terminals (P(+), N(-)) of the DB unit to the link circuit connection
terminals (P(+), N(-)) of the inverter. If mistaking the polarity or connecting to the other terminal, the
DB unit may be damaged. Further, check the power supply voltage for conforming to the inverter
specification.
② Ensure to ground the grounding terminal to prevent disasters such as electric shock and fire and to
minimize noise.
③ Use a reliable crimp terminal for connection between a terminal and a cable.
④ After terminating the connection (wiring), check the followings:
a. Check that the connection is correct.
b. Check that all necessary connections have been made.
c. Check that there is no short-circuit or ground fault between terminals and cables.
⑤ Connection modification after power-on
The smoothing capacitor in the direct current portion of the main circuit cannot be discharged
immediately after the power is turned off. To ensure safety, use a multimeter to check that the voltage
of the direct current (DC) is lowered to the safety range (25V DC or less) after the charge lamp goes
off. Also, check that the voltage is zero before short-circuiting. The residual voltage (electric charge)
may causes sparks.
・ Always connect a grounding wire.
Electric shock or fire may result.
・ Ensure that a licensed specialist performs all wiring works.
・ Check that the power is turned off (open) before commencing wiring operations.
Electric shock may result.
Front view of inside the unit
Fig. 2-3-1 Front view after removing the front cover
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