Yaskawa Matrix Converter - Manual (Page 46)

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‹ 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