Yaskawa A1000 6-Phase/12-Pulse Input - Manual (Page 85)

n Factory Recommended Branch Circuit Protection
Yaskawa recommends installing the following branch circuit protection on each of the 6 phases of the secondary circuit of a
6-Phase/12-Pulse transformer to maintain standards compliance. Semiconductor protective type fuses as listed in Table 13 are
preferred. Alternate branch circuit protection devices are listed in Table 14 . Refer to local codes for proper Branch Circuit
Protection on the primary circuit of a 6-Phase/12-Pulse transformer.
NOTICE: If a fuse is blown or a Ground Fault Circuit Interrupter (GFCI) is tripped, check the wiring and the selection of peripheral devices
to identify the cause. Contact Yaskawa before restarting the drive or the peripheral devices if the cause cannot be identified.
Table 13 Factory Recommended Drive Branch Circuit Protection
Drive Model
Bussmann Fuse Type
Model Fuse Ampere Rating (A)
4T0058o FWH-100B 100
4T0072o FWH-150B 150
4T0088o FWH-200B 200
4T0103o FWH-200B 200
4T0139o FWH-200B 200
4T0165o FWH-200B 200
4T0208o FWH-275A 275
4T0250o FWH-275A 275
4T0296o FWH-350A 350
4T0362o FWH-350A 350
4T0414o FWH-450A 450
4T0515o FWH-500A 500
4T0675o FWH-700A 700
n Alternative Branch Circuit Protection
The alternative branch circuit protection is time delay fuses. The maximum time delay fuse is 175% of drive input current
rating listed in Table 14 . This covers any Class J or T fuse.
Table 14 Alternative AC Drive Branch Circuit Protection
Drive Model
Nominal Output Power
kW (HP)
Drive Input Amps/Phase <1>
Time Delay Fuse Class J or T
Rating Amps Max.
4T0058o 30 (40) 27 45
4T0072o 37 (50) 33 50
4T0088o 45 (60) 39.5 60
4T0103o 55 (75) 48.5 80
4T0139o 75 (100) 65.5 110
4T0165o 90 (125) 78 125
4T0208o 110 (150) 95 150
4T0250o 132 (200) 114 175
4T0296o 160 (250) 137.5 225
4T0362o 185 (300) 158.5 275
4T0414o 220 (350) 188 300
4T0515o 250 (400) 213.5 350
4T0675o 355 (550) 301.5 500
<1> This amp rating is 1/2 rated current because the 3-Phase current is split between 6 input phases for the 6-Phase/12-Pulse drive. Use this amp rating
to select input wiring size as recommended in Table 5 .
n Main Circuit Terminal Wiring
Yaskawa recommends using closed-loop crimp terminals on all drive models. To maintain UL/cUL approval, UL Listed
closed-loop crimp terminals are specially required when wiring the drive main circuit terminals. Use only the tools
recommended by the terminal manufacturer for crimping. Refer to Table 15 for closed-loop crimp terminal recommendations.
10 Standards Compliance
YASKAWA TOEP YAIA1U 02A YASKAWA AC Drive – A1000 6-Phase/12-Pulse Input Installation Manual 85