N700 Operating Instructions and Parts Manual
2. Installation and Wiring
13
z
Make the RC value of the thermal relay the value of 1.1 times of motor rated electric
current.
③
Direct current reactor (DCL) connection terminals (PD, P)
z
These are the terminals to connect the current reactor DCL (optional) to help improve the
power factor.
z
The short bar is connected to the terminals when shipped from the factory, if you are
to connect a DCL you will need to disconnect the short bar first.
z
When you do not use a DCL, do not disconnect the short bar.
④
External braking resistor connection terminals (P, RB)
z
The regenerative braking circuit (BRD) is built-in as standard up to the 22
㎾
(30HP)
inverter.
z
When braking is required, install an external-braking resistor to these terminals.
z
The cable length should be less than 16 feet, and twist the two connecting wires to
reduce inductance.
Do not connect any other device other than the external braking resistor to these
terminals.
z
When installing an external braking resistor make sure that the resistance is correctly
rated to limit the current drawn through the BRD.
⑤
Regenerative breaking unit connection terminals (P, N)
z
The Inverters rated more than 30
㎾
don't contain a BRD circuit. If regenerative
braking is required an external BRD circuit (Option) is required along with the resistor
(Option).
z
Connect external regenerative braking unit terminals (P, N) to terminals (P, N) on the
inverter.
z
The braking resistor is then wired into the External Braking unit and not directly to the
Inverter.
z
The cable length should be less than 5 meters, and twist the two connecting wires to
reduce inductance.
⑥
Earth Ground (G)
z
Make sure that you securely ground the inverter and motor for prevention of electric
shock.
z
The inverter and motor must be connected to an appropriate safety earth ground and
follow all local electrical codes.
z
In case
connecting 2 or more inverters, use caution not to use a loop which can cause
some malfunction of the inverter.
Fig. 2- 6 Earth Ground (G)
INVERTER
INVERTER
INVERTER
INVERTER
INVERTER
INVERTER