Short Circuit Protection Requirements For Ul Listing; Ul Compliance - YASKAWA GA800 Maintenance & Troubleshooting

5.15

Short Circuit Protection Requirements for UL Listing

WARNING! Electrical Shock Hazard. After the input protective device trips, do not immediately energize the drive or operate
peripheral devices. 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. If you do not know the cause of the problem, contact
Yaskawa before you energize the drive or peripheral devices. If you do not fix the problem before you operate the drive or peripheral
devices, it can cause serious injury or death.
◆

UL Compliance

Install one of the types of short circuit protection devices in this section to comply with UL 508C. Semiconductor
protective type fuses are recommended, but the tables also show alternative short circuit protection devices.
■
Molded Case Circuit Breaker (MCCB) Ratings
• Maximum MCCB rating is 200% of the Normal-Duty drive full load output amp (FLA) rating.
• When you use MCCBs you must mount the drive in a ventilated enclosure according to the minimum enclosure
volume specified in this document.
Note:
When you use MCCBs, current limiting type are recommended, but not required.
■
Semiconductor Fuse Ratings
• When you use semiconductor fuses as UL listed drive protection, the drives and fuses must be in the same
enclosure.
• Where multiple semiconductor fuse ratings are listed for a single drive, Yaskawa recommends the larger fuse for
cyclical load applications that frequently approach 150% overload. Smaller semiconductor fuses (than what is
listed) of the same manufacturer and series are permitted; however, this can cause fuses to clear prematurely.
■
Non-Semiconductor Fuse Ratings
• Maximum CC, J, T, RK1 or RK5 fuse rating is 175% of the Normal-Duty drive full load output amp (FLA) rating.
• When you use class CC, J, or T fuses as UL listed drive protection, models 4371 and larger have the same
minimum enclosure volume requirements as MCCBs.
• When you use RK1 or RK5 fuses, you must mount the drive in a ventilated enclosure according to the minimum
enclosure volume specified in this document.
■
Short Circuit Current Rating (SCCR)
The maximum SCCR provided by drive and fuse, or drive and MCCB combinations in this document, is 100,000
RMS symmetrical amps.
• 240 V models: Use the protection specified in this document to prepare the drive for use on a circuit capable of
delivering not more than 100,000 RMS symmetrical amps and not more than 240 Vac.
• 480 V models: Use the protection specified in this document to prepare the drive for use on a circuit capable of
delivering not more than 100,000 RMS symmetrical amps and not more than 480 Vac.
■
Electric Code Compliance
The user must provide short circuit protection to protect input branch circuits as specified by the National Electric
Code (NEC), the Canadian Electric Code, Part 1 (CEC), and local codes.
■
Required Short Circuit Protection
Table 5.21 Required Short Circuit Protection for GA800 AC Drives (240 V Class)
Protected Enclosure Not Required
Drive
Semiconductor Fuse
Catalog
Part Number
Code
Manufacturer: Eaton/
GA80U
2004
YASKAWA TOEPYAIGA8001B GA800 Drive Maintenance & Troubleshooting
Class CC, J or T Fuse
Maximum Amps
Bussman
Three-phase 240 V Class
FWH-45B 7

5.15 Short Circuit Protection Requirements for UL Listing

Ventilated Protected Enclosure Required
MCCB
Maximum Amps
15
Class RK1
or RK5 Fuse Enclosure Volume
Maximum Minimum (in
Amps
7 4195
5
3 )
419