Input And Output Wiring In The Main Circuit - YASKAWA CIMR-ACA4011 Instruction Manual

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 2.8.
25P5 to 2045: 3-phase,
200 to 220 VAC, 50/60 Hz
45P5 to 4075: 3-phase,
380 to 480 VAC, 50/60 Hz
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.
Power
MCCB
supply
* For 400 V class MxCs, connect a 400/200 V transformer.
Note: 400 V class MxC for 75 kW is under development.
Fig 2.8 MCCB Installation
Wiring Main Circuit Terminals
MxC
MC
R/L1
S/L2
T/L3
*
MC
MB
on
off
Fault output
SA
(NC)
MC
MC
11
2-