Motor Controllers AC Variable Frequency Drives Type VariFlex
3
RVLF
3.3.5. Considerations for Peripheral Equipment
Power
Ensure that the supply voltage is correct. A molded-
case circuit breaker or fused disconnect must be
installed between the AC source and the inverter.
Circuit Breaker
& RCD
Use a molded-case circuit breaker that conforms
to the rated voltage and current of the inverter. Do
not use the circuit breaker as the run/stop switch
for the inverter. Residual Current Circuit Breaker
(RCD). Current setting should be 200mA or above
and the operating time at 0.1 second or longer to
prevent malfunctions.
Magnetic
contactor
Normally a magnetic contactor is not needed. A
contactor can be used to perform functions such
as external control and auto restart after power
failure. Do not use the magnetic contactor as the
run/stop switch for the inverter.
AC reactor for
power quality
improvement
When a 200V/400V inverter with rating below
15KW is connected to a high capacity power
source (600KVA or above) then an AC reactor can
be connected for power factor improvement and
reducing harmonics.
Input noise
lter
RVLF inverter has a built-in lter to Class “A” rst
Environment. (CategoryC2). To satisfy the required
EMC regulations for your specic application you
may require an additional EMC lter.
Inverter
Connect the single phase power to Terminals, L1
(L) & L3(N) and three phase power to Terminals:
(200V: L1 (L), L2, L3 (N) or 400V: L1, L2, L3)
Warning! Connecting the input terminals T1, T2,
and T3 to AC input power will damage the inverter.
Output terminals T1, T2, and T3 are connected to
U, V, and W terminals of the motor. To reverse the
motor rotation direction just swap any two wires at
terminals T1, T2, and T3. Ground the Inverter and
motor correctly. Ground resistance for 200V power
<100 Ohms.
Motor
Three-phase induction motor. Voltage drop on
motor due to long cable can be calculated.
Volts drop should be < 10%.
Phase-to-phase voltage drop (V)= 3 ×resistance of
wire (Ω/km) ×length of line (m) × current × 10-3
Specications are subject to change without notice. Pictures are just an example. For special features and/or customization, please ask to our sales network. 13/12/2017 19
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