User Manual
EM100 Mini Inverter
27
3.2.4 Standard Wiring of Main Circuit
U
V
W
T/L
3
S/L
2
R/L
1
PB
M
Figure 3-5 Standard Wiring of EM100 Main Circuit
3.2.5 Wiring Main Circuit on Input Side
Installing a Circuit Breaker
Install an air circuit breaker (MCCB) between the power supply and input terminals.
z
Choose a MCCB with a capacity of 1.5-2 times of inverter rated current.
z
The time features of MCCB should meet that of overheating protection of inverter
(150% rated current /1 minute).
z
If single MCCB is shared by two or more inverters or other devices, the contact of
fault output relay shall be connected to power contactor coil, so that the power supply
will be turned off by the fault signals, as shown in Figure 3-6.
Figure 3-6 Connecting to Input Circuit Breaker
Installing a Leakage Circuit Breaker
High frequency leakage current is generated by high frequency PWM signal output of
inverter. Select a special purpose leakage breaker with a trigger current
≥
30mA. For a
regular leakage breaker, the trigger current:
≥
200mA and the active time at 0.1S or
above.
Installing an Electromagnetic Contactor
Install an electromagnetic contactor which is applicable to inverter power as shown in
Figure 3-6.
z
Start/stop of the inverter can be controlled by the electromagnetic contactor on input
side. Inverter may break down if the electromagnetic contactor is on and off frequently.
The operation interval between start and stop of the inverter shall
≥
30 minutes, if
electromagnetic contactor on input side must be used for controlling.
z
The inverter will not automatically start if power is on after failure.
Connecting to the Terminal Block
Power input phase sequence is not related to the phase sequence of terminals R, S, and T
on the terminal block, any two of them can be connected connected randomly.
