User Manual of EM730/EM730E Series Inverter
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Fault relay
contact
EC
EB
MC
OFF
MC
ON
MCCB
T
S
R
Inverter
Fig.3-4 Connection of Input Circuit Breaker
Installation of leakage circuit breaker
Since the inverter outputs high-frequency PWM signals, a high-frequency leakage current
will be generated. Please use the dedicated leakage circuit breaker with the current sensitivity
above 30 mA. If an ordinary leakage circuit breaker is used, use a leakage circuit breaker with
the current sensitivity above 200 mA and action time of more than 0.1 s.
Installation of electromagnetic contactor
Connect the electromagnetic contactor that matches the power of the inverter, as shown in
Fig. 3-4.
Do not control the operation and stop of the inverter via the electromagnetic
contactor on the incoming line side. Frequent use of this method is an important
cause of damage to the inverter. The frequency of operation and stop of the
electromagnetic contactor on the incoming line side must not exceed once every 30
min.
After the power supply is restored, the inverter will not run automatically.
Connection with terminal block
The phase sequence of the input power supply is unrelated to that (R, S, T) of the terminal
block, so that the terminals of the input power supply can be connected arbitrarily.
Installation of AC reactor
When a large-capacity (above 600KVA) power transformer is connected, or the input
power supply is connected to a capacitive load, a high inrush current will be generated, which
