EM330D User Manual
A Special Purpose Inverter for Hoisting
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If one MCCB is used for more than one inverter, 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 3-4.
Fault Relay
Contactor
EC
EB
MC
OFF
MC
ON
MCCB
T
S
R
EM330D
Figure 3-4 Connecting to Input Circuit Breaker
Installing a Leakage Circuit Breaker
High frequency leakage is generated by high frequency PWM signal output of inverter.
Please 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.
Please adjust filter frequency to lower high frequency leakage if necessary.
Installing an Electromagnetic Contactor
Install an electromagnetic contactor which is applicable to the power of inverter as
shown in Figure 3-4.
The inverter can be started and stopped by opening and closing 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.
The inverter will not automatically start if power is on after failure.
Connecting to the Terminal Block
No phase sequence requirements for input power supply, R, S, and T on the terminal
block, any two of them can be connected randomly.
Installing an AC Reactor
If the inverter is connected to a transformer with large capacity (≥600kVA), or power
supply is connected to capacitive load, an excessive surge current will occur and
rectifier of inverter can be broken down. Install an optional 3-phase AC reactor on
input side of inverter to suppress peak current and voltage, and improve power factor
of the system.
