Electrical Installation
3
3.15 Protect the Drive during Failures
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 109
3.15 Protect the Drive during Failures
Use branch circuit protection to protect against short circuits and to maintain compliance with UL61800-5-1. The
manufacturer recommends connecting semiconductor protection fuses on the input side for branch circuit
protection.
WARNING! Electrical Shock Hazard. Do not immediately energize the drive or operate peripheral devices after the drive blows
a fuse or trips an RCM/RCD. Wait for the time specified on the warning label at a minimum and make sure that all indicators are
OFF. Then check the wiring and peripheral device ratings to find the cause of the problem. Contact the manufacturer before
energizing the drive or peripheral devices if the cause is not known. Failure to obey can cause death or serious injury and
damage to the drive.
◆ Branch Circuit Protection for 400 V Class (ND)
Use the fuses specified in this document to prepare the drive for use on a circuit that supplies not more than
100,000 RMS symmetrical amperes and 480 Vac when there is a short circuit in the power supply.
The built-in short circuit protection of the drive does not provide branch circuit protection. The user must provide
branch circuit protection as specified by the National Electric Code (NEC), the Canadian Electric Code, Part I
(CEC), and local codes.
Table 3.17 Factory-Recommended Branch Circuit Protection: 400 V Class (ND)
Drive Model
Maximum Applicable Motor
Output
kW (HP)
Input Voltage < 460 V
Maximum Applicable Motor
Output
kW (HP)
Input Voltage ≥ 460 V
Input Current Rating
A
Semiconductor Protection
Fuse Rated Current
Manufacturer: EATON/
Bussmann
4002 0.75 (1) 0.75 (1) 2.5 FWH-50B
4004 1.5 (2) 1.5 (2) 4.7 FWH-50B
4005 2.2 (3) 2.2 (3) 6.7 FWH-50B
4007 3.0 (4) 3.0 (4) 8.9 FWH-60B
4009 4.0 (5) 3.7 (5) 11.7 FWH-60B
4012 5.5 (7.5) 5.5 (7.5) 15.8 FWH-60B
4018 7.5 (10) 7.5 (10) 21.2 FWH-80B
4023 11 (15) 11 (15) 30.6 FWH-90B
4031 15 (20) 15 (20) 41.3 FWH-150B
4038 18.5 (25) 18.5 (25) 50.5 FWH-200B
4044 22 (30) 22 (30) 59.7 FWH-200B
4060 30 (40) 30 (40) 58.3 FWH-225A
4075 37 (50) 37 (50) 71.5 FWH-250A
4089 45 (60) 45 (60) 86.5 FWH-275A
4103 55 (75) 55 (75) 105 FWH-275A
4140 75 (100) 75 (100) 142 FWH-300A
4168 90 (125) 90 (125) 170
FWH-325A
FWH-400A
*1
4208 110 (150) 110 (150) 207 FWH-500A
4250 132 (175) 150 (200) 248 FWH-600A
4296 160 (200) 185 (250) 300 FWH-700A
4371 200 (250) 220 (300) 373 FWH-800A
4389 220 (300) 260 (350) 410 FWH-1000A
4453 250 (335) 300 (400) 465 FWH-1200A
4568 315 (400) 335 (450) 584 FWH-1200A
4675 355 (450) 370 (500) 657
FWH-1400A
FWH-1600A
*1
*1 A fuse with a large rated current for applications with repeated loads is recommended.
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