Optional Cabinets; Arc Resistant Design (Optional); Internal Arc Classification (Iac); Associated Protection Requirement - ABB ACS1000 User Manual

3.7.1. Optional cabinets

If medium voltages are present in an optional cabinet during operation (eg, braking chopper
and output disconnector), the door is secured by an electro-mechanical lock as well as a door
monitoring switch. If the cabinet is UL certified, the door is further secured with extra screws.
The lock and the switch release the door after the DC link of the drive has discharged and the
drive has been grounded.

3.8. Arc resistant design (optional)

The optional "Arc Resistant Design" provides the drive with arc fault protection in accordance
with IEC 62477-2.
The ABB arc resistant classes in Table 3 indicate the type of arc proofing that a drive uses.
Depending on the drive configuration, classes I and II are available for an ACS1000A.
For information on the arc resistant design class of your drive, see the project-specific
"Converter Data Sheet" ("Appendix B - Technical data" of the ACS1000A user manual).

TABLE 3 ABB arc resistant classes

ABB class Description
Class I Protection based on arc prevention (NOT certified according to IEC 62477-2)
Protection based on arc resistant cabinet structure, IAC certified by 3rd body according
Class II
to IEC 62477-2
Protection based on external arc fault limitation and elimination. HV fuses are applied
Class III
externally to limit the arc fault current, IAC certified by 3rd body according to IEC 62477-2
Class IV Fast arc detection and elimination, IAC certified by 3rd body according to IEC 62477-2

3.8.1. Internal arc classification (IAC)

The arc fault rating, which is based on arc fault tests, is on the label underneath the drive rating
plate of the drive.
Internal Arc Classification (IAC)
ABB Class II
IAC F
IEC 62477-2 2b
Distance [m] 0.3

Fig. 23. IAC label example

3.8.2. Associated protection requirement

The arc resistant design requires associated protections that are not included in the scope of
the delivery, ie, a main circuit breaker.
For more information on the MCB:
– MCB overview: Section 2.4, "Main circuit breaker protection device", page 26
– MCB requirements: "Input circuit breaker engineering guideline" , 3BHS260163 E01
PRODUCT
ACS1000A
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User manual
POWER ELECTRONICS AND CABINET FEATURES
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3BHB049908R1205
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3BHS213401 E01
APR SC
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