N700E INSTRUCTION MANUAL
2-7
2.1.2.3
DC Reactor Terminals: PD, P (Except 300LF~750LF)
These are the terminals to connect a DC reactor (Option) to help improve the power factor.
The shorting bar is connected to the terminals when shipped from the factory. If you are going
to connect a DC Reactor, you will need to remove the shorting bar.
When you do not use a DC Reactor, do not disconnect the shorting bar.
2.1.2.4
External Braking Resistor Terminals: P, PB (<= 22kW(30HP) Units)
The regenerative braking circuit is built-in as standard
When braking is required, install an external braking resistor to these terminals.
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.
When installing an external braking resistor make sure that the resistance is correctly rated to
limit the current drawn through the BRD (Dynamic Braking Module).
2.1.2.5
Regenerative Breaking Unit Terminals: P, N ( >= 30kW(40HP) Units)
VFDs rated greater than and equal to 30KW(40HP) do not contain an internal BRD circuit. If
regenerative braking is going to occur, then an external BRD circuit (Option) is required along
with a resistor. (Option)
Connect external regenerative braking unit terminals (P,N) to terminals (P,N) on the VFD.
The braking resistor is then wired into the External BRD board and not directly to the VFD.
The cable length between the VFD and the BRD board, BRD board and the resistor, should be
less than 16 feet and twist the connecting wires to reduce inductance.
2.1.2.6
Earth Ground: G
Make sure that you securely ground the inverter and motor for prevention of electric shock.
The inverter and motor must be connected to an appropriate safety earth ground and follow all
local electrical codes.
In case connecting 2 or more inverters, use caution not to create a ground loop situation which
may cause the inverter to malfunction. Use a star configuration grounding technique.
Figure 2-3: Earth Ground (G) Connection
INVERTER
INVERTER
INVERTER
INVERTER
INVERTER
INVERTER