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Selection Tables - Altivar 61 And Altivar 61 Plus Variable Speed Drives Page 28


Altivar 61 variable speed drives

Short Circuit Current Ratings

1. This column shows the maximum prospective short circuit current value that cannot be exceeded without adding input impedance. Electrical distribution systems with a higher prospective short circuit current will cause higher input currents in the front end of the drive. It is possible for the tested SCCR rating of the drive to be lower than this Input rating. The tested SCCR rating can be higher than this input rating when a line reactor is used. Add the inductance referred in the table at the input of the drive if installing the drive on a system with higher prospective short circuit current. A 3% (minimum) input line reactor or equivalent inductance is required for the 500..600 Vac Altivar 61s and provides the listed value with the listed fuse protection. 2. An ATV61 output short circuit test was performed for 100 kA. In addition to providing a rating based on shorting the output of the drive, these short circuit rating have been obtained by short- ing components internal to the Altivar 61. These ratings allow proper coordination of short circuit protection. Note: The integral solid state short circuit protection in the drive does not provide branch circuit protection. Branch circuit protection must be provided in accordance with the National Electrical Code and any local codes. The listed line reactor or minimum impedance is required to obtain ratings above the Input Rating. 3. Ratings apply to an Altivar 61 mounted in a non-ventilated Type 1, 3R, 4(X) or 12 rated enclosure. Use noted ratings when using a Type 1 kit. Minimum enclosure volume allows for the speci- fied SCCR. Your application specific thermal requirements may require a larger enclosure 4. The fuse ratings in this column are for an Altivar 61 drive installed with a VW3A92pppp Type 1 conduit kit. Fuse type must be fast acting Class J fuses unless otherwise noted. These fuse ratings in this column can also apply to Altivar 61 drives installed in a Type 1, 3R, 4(X), or 12 rated enclosure that has a minimum volume listed in the table 5. Use Bussmann fuses Class J ref. LPJ600SP, 600V max. 6. Fuse Class J / fast acting, 600V max. 7. Fuse Class T / fast acting, 600V max 8. Semi-conductor fuses Ferraz Shawmut A070UD32KI900 or A070UD32TTI900. 9. Can be ordered without a DC Choke for connections to the DC BUS or when using a line choke by adding D at the end of the reference. 10. Circuit breakers with lower interrupt ratings can be used within the same circuit breaker frame rating. For 380 / 480 Vac, replace LLL with LDL for 18kA or LGL for 35kA or LJL for 65kA inter- rupt rating. For 380 / 480 Vac, replace JLL with JDL for 18kA or JGL for 35kA or JJL for 65kA interrupt rating. 11. The following diagram shows how to address drives with two rectifiers:

A: The ATV61 supply must be split up in front of the line reactors, if they are used. B: The monitoring of the fuses is necessary to protect the inverter against unbalanced load. It must act on mains contactor or pulse inhibit (e.g. digital input "External fault", see Programming guide) HS: Main switch (to be used if required according to the local regulations) NH: Mains fuses considering table "Fuse Ampere Rating" (absolutely necessary) NS: Mains contactor (to be used if required according to the local regulations)

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