KE300A Inverter Mechanical and Electric Installation
38
connected reversely, or it may damage the inverter and even cause fire.
The wiring length of the brake unit should not exceed 10 meters. Twisted wires or pair wires should be
used and connected in parallel.
Do not connect the brake resistor directly to the DC bus, or it may damage the inverter and even cause fire.
c) Connecting terminals (+) and PB of brake resistor:
The connecting terminals of the brake resistor are effective only for the inverter of less than 37kW with
built-in brake unit.
The prototype of brake resistor can refer to the recommended value and the wiring length should be less
than 5 meters. Otherwise it may damage the inverter.
d) Connecting terminals P1 and (+) of external DC reactor:
For the inverter above 30kW with external reactor, when assembling, remove the connector between
terminals P1 and (+), and connect a DC reactor instead.
e) 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. When the length of motor cable is longer than 100 meters, it needs
to install an AC output reactor.
f) Earth terminal PE
:
This terminal should be earthed reliably, with resistance of earth ca
ble of less than 0.1Ω. Otherwise, it may
cause fault or damage the inverter.
Do not share the earth terminal
and zero line of the power supply.
3.2.6 Control terminals and connections
1)
Control circuit terminals
AO1
RS485+ RS485-
COM
PLC
+24V
D4
HDO
AI1
GND +10V
D1
D2
D3
D5
HDI
T1A
T1B
T1C
Figure 3-13 Control Circuit Terminals
（
1AC/3AC 220V, 0.4
～
1.5kW
）
AI1
RS485+ RS485-
GND
COM CME COM
+10V GND
D1
D2
D3
D4
T1A
T1B
T1C
HDO
AI2
AO1 AO2
PLC +24V
D6
D5
HDI
T2B
T2A
T2C
Figure 3-14 Control Circuit Terminals
（
2.2
～
1400kW
）
