Chapter 3 Wiring
10
3-3 Main circuit terminal description
Terminal
symbol
Function description
R S T
Power input terminal for three-phase 380V inverter.
L
N
(
Power input terminal for single-phase 220V inverter
)
U V W
The inverter output terminal is connected to a three-phase AC motor.
B1
B2
Braking resistor connection terminal (optional)
(
+
)(
-
)
External brake unit connection terminal (optional).
Ground terminal.
When wiring, please follow the electrical regulations to ensure the safety.
3-3-1 Power input terminal R
,
S
,
T
◆
A circuit breaker is required between the three-phase AC input power supply and the
main circuit terminals (R, S, T). It is better to connect a magnetic contactor (MC) in series to
cut off the power supply when the inverter protection function is activated (the R-C surge
absorber is required at both ends of the electromagnetic contactor).
◆
If the inverter is equipped with an earth leakage circuit breaker as a leakage fault
protection, in order to prevent the leakage circuit breaker from malfunctioning, please select
a sensitivity current of 200 mA or more and an operation time of 0.1 second or longer.
◆
In order to prevent the high voltage and high current input into the power supply
circuit and damage the rectifier part, it is necessary to connect the AC reactor on the input
side, and also improve the power factor of the input side.
◆
Do not use the main circuit power ON/OFF method to control the operation and stop
of the inverter. The drive's operation and stop should be controlled using the RUN and STOP
keys on the keypad panel or the control loop terminals. If the main power ON/OFF method
must be used to control the operation of the inverter, it can only be performed once per hour.
◆
To reduce the interference of the inverter to surrounding equipment, the noise filter
can be connected to the input side.
◆
Do not connect the three-phase power supply to the single-phase power supply.