Chapter 3 Mechanical and Electrical Installation
-34-
Terminals Name Description
terminals of DC bus
(+) and PB
Connecting terminal of brake
resistor
U, V and W
Output terminal of inverter Connect the three-phase motor
Earth terminal
Earth terminal
3) Notes on Wiring:
A. Input power L1, L2 or R, S and T:
The cable connection at the input side of the inverter has no phase sequence requirement.
B. DC bus (+), (-) terminal:
Note that the (+) and (-) terminals of DC bus have residual voltage right after power-on. It needs to
make sure that the voltage is less than 42V prior to wiring connection. Otherwise there may be
danger of electric shock. Do not connect the brake resistor directly to the DC bus, or it may
damage the inverter and even cause fire.
Connecting terminals (+) and PB of brake resistor:
The connecting terminals of the brake resistor are effective only for the inverter of less than
30kW with built-in brake unit.
The prototype of brake resistor can refer to the recommended value and the wiring length
shall be less than 5 meters. Otherwise it may damage the inverter.
Terminals U, V, W at the output side of the inverter:
The inverter output side cannot connect to the capacitor or surge absorber. Otherwise, it
may cause frequent inverter protection and even damage the inverter.
In case the motor cable is too long, it may generate electrical resonance easily due to the
impact of distributed capacitance, thus damaging the motor insulation or generating higher
leakage current to invoke over current protection of the inverter. If it is over 100m, AC output
reactor is required.
E. Earthing terminal
˖
This terminal shall be earthed reliably, with resistance of earthing cable of less than 5ȍ.
Otherwise, it may cause fault or damage the inverter. Do not share the earth terminal and zero
line of the power supply.
5. Control terminals and connection:
1) The control circuit terminals are arranged as follows:
Fig.3-8 Layout of Control Circuit Terminals
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