Wiring The Main Circuits; Wiring Main Circuit Inputs; Installing A Molded-Case Circuit Breaker; Installing A Ground Fault Interrupter - YASKAWA VARISPEED-616G5 Instruction Manual

3.4.5 Wiring the Main Circuits

This section describes wiring connections for the main circuit inputs and outputs.

Wiring Main Circuit Inputs

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Installing a Molded-case Circuit Breaker

Always connect the power input terminals (R, S, and T) and power supply via a molded-case circuit break-
er (MCCB) suitable for the Inverter.
Choose an MCCB with a capacity of 1.5 to 2 times the Inverter's rated current.
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For the MCCB's time characteristics, be sure to consider the Inverter's overload protection (one min-
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ute at 150% of the rated output current).
If the same MCCB is to be used for more than one Inverter, or other devices, set up a sequence so that
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the power supply will be turned OFF by a fault output, as shown in Figure 3.7.
Power
supply
200 V class: 3-phase,
200 to 230 VAC,
50/60 Hz
400 V class: 3-phase,
380 to 460 VAC,
50/60 Hz
Fig 3.7

Installing a Ground Fault Interrupter

Inverter outputs use high-speed switching, so high-frequency leakage current is generated. Therefore, at
the Inverter primary side, use a ground fault interrupter that detects only the leakage current in the frequen-
cy range that is hazardous to humans and excludes high-frequency leakage current.
For the special-purpose ground fault interrupter for Inverters, choose a ground fault interrupter with
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a sensitivity amperage of at least 30 mA per Inverter.
When using a general ground fault interrupter, choose a ground fault interrupter with a sensitivity am-
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perage of 200 mA or more per Inverter and with an operating time of 0.1 s or more.
Installing a Magnetic Contactor
If the power supply for the main circuit is to be shut off during a sequence, a magnetic contactor can be
used instead of a molded-case circuit breaker.
When a magnetic contactor is installed on the primary side of the main circuit to forcibly stop the Inverter,
however, the regenerative braking does not work and the Inverter will coast to a stop.
The Inverter can be started and stopped by opening and closing the magnetic contactor on the primary
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side. Frequently opening and closing the magnetic contactor, however, may cause the Inverter to break
down.
When the Inverter is operated with the Digital Operator, automatic operation cannot be performed after
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recovery from a power interruption.
If the Braking Resistor Unit is used, program the sequence so that the magnetic contactor is turned OFF
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by the contact of the Unit's thermal overload relay.
Connecting Input Power Supply to the Terminal Block
Input power supply can be connected to any terminal R, S or T on the terminal block; the phase sequence
of input power supply is irrelevant to the phase sequence.
MCCB
* For 400 V class Inverters, connect a 400/200 V transformer.
MCCB Installation
3 - 13
3.4 Wiring Main Circuit Terminals
MC
:
MC
ON
SA
OFF
MC
VS-616G5
R
S
3
T
19
Fault output
(NC)
20