Yaskawa Matrix Converter User Manual Page 46

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2-12
Input and Output Wiring in the Main Circuit
This section describes wiring connections for the main circuit inputs and outputs.
Wiring Main Circuit Inputs
Observe the following precautions when wiring inputs for the main circuit power supply.
Installing a Molded-Case Circuit Breaker
Always connect the power input terminals (R, S, and T) and power supply via a molded-case circuit breaker
(MCCB) suitable for the MxC.
Choose an MCCB with a capacity of 1.5 to 2 times larger than the rated current of the MxC.
The MCCB operation time should reflect the overload protection time of the MxC.
If the same MCCB is to be used for more than one MxC or in other devices, set up a sequence so that the
power supply will be turned off by a fault output, as shown in Fig 2.9.
Fig 2.9 MCCB Installation
Installing a Ground Fault Interrupter
MxC outputs use high-speed switching, causing high-frequency leakage current to be generated. A ground
fault interrupter with countermeasures for high-frequency distortion is therefore needed on the primary side of
the MxC in order to detect any hazardous leakage current within the frequency, and to exclude that high-fre-
quency leakage current.
When deciding to use a ground fault interrupter with countermeasures for high-frequency distortion
choose one with a sensitivity amperage of at least 30 mA per MxC.
A general ground fault interrupter without countermeasures for high-frequency distortion is not recom-
mended. If a general ground fault interrupter malfunctions, replace it with a ground fault interrupter with a
sensitivity amperage of 200 mA or more per MxC and with an operating time of 0.1 s or more.
R/L1
MC
*
MCCB
MC
MC
S/L2
T/L3
MB
MC
SA
* For 400 V class MxCs, connect a 400/200 V transformer.
Power
supply
MxC
Fault output
(NC)
25P5 to 2045: 3-phase,
200 to 220 VAC, 50/60 Hz
45P5 to 4075: 3-phase,
380 to 480 VAC, 50/60 Hz
off
on
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