Published: 10/31/2005
| Question: | Can a MCCB rated higher than the recommended rating, be installed ahead of a drive to supply the 3 phase power? |
| Answer: | This is not recommended. Rules for installing a MCCB are similar to input fusing. Too high of a value will not be safe enough to trip, in case of high amperage on the input of a drive. This could result in damage to the input semiconductor devices. Always use recommended branch circuit protection components according to NEC and/or manufacturer recommendations..
Charts are provided below for choosing the proper branch short circuit protection for E7 and F7 AC drives.
E7 recommendations found in the E7 Users Manual.
F7 Branch Short Circuit Protection
Fuse Type:
UL designated Time-Delay or Non-Time Delay Fuse
Class: CC, J, T, RK1 or RK5
Designators (typical): KTK, FNQ, FRS, LPJ, LPS, JKS, JJN, or JJS
Voltage Rating: 250V for drives with 208 - 240V input / 600V for drives with 480V input
Circuit Breaker Type:
Inverse Time MCCB
Voltage Rating: 600V
Recommended fuse and MCCB based on NEC Table 430-152.
If available current ratings cannot be provided, the fuse rating (A) should match rated input current of the drive.
Warning: Input fuses are required for proper branch circuit short circuit protection of all drives.
Failure to use the listed fuses may result in damage to the drive and/or personal injury.
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Product Information:
| Product Group: | Inverters/Drives |
| Product: | E7 Drive, F7 Drive |
| Applications: | |
| Category: | Installation; Protective Features |
Other Information:
SAFETY PRECAUTIONS AND INSTRUCTIONS FOR USE OF FAQ INFORMATION!
Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not superceed it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ.
All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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