Safety And Protection Requirements; Maintenance Recommendation - ABB ACS5000 User Manual

2.7.1

Safety and protection requirements

For safety and protection reasons, the MCB must meet the stipulated
minimum requirements of the specifications of ABB MV Drives. It is the
system integrator's responsibility to ensure that the minimum
requirements are met. The minimum requirements for the MCB are stated
in this note and in the respective MCB engineering guideline, which are
available for each medium voltage drive from ABB.
The safety requirements for the drive are based on the
following standards:
• ISO 13849-1
• IEC 60204-1
2.7.2 Minimum requirements for MCB and MCB control
• The MCB open and / or trip command has to be wired directly from
the drive to the MCB.
It is not permitted to wire the trip command through any PLC or
DCS system if it is not certified to meet SIL three-level requirements
and to fulfill the timing requirements outlined below.
Opening of the MCB by the drive must be possible at any time. It is
not permitted to interrupt the open and / or trip command, eg, by
a local-remote switch in the MCB.
When the MCB is in service position, the drive must have exclusive
control of closing the MCB. Local closing of the MCB is
not permitted.
• The maximum opening time of the MCB must never exceed the
product- or project-specific maximum time defined in the MCB
specifications. Typical maximum values for the drive are defined
as follows:
- M a x im um p rotec tion tr ip tim e: 75 ms
The maximum protection trip time is the maximum allowed
breaking time (open and arcing) of the breaking device after the
open command has been initiated to prevent further damage to
the drive, such as diode failures.
- M a x im um s a fety tr ip tim e: 500 ms
The maximum safety trip time is the maximum allowed time to
ensure safe disconnection of the main power supply to prevent
any hazard to personnel.
Note: For more information on the MCB requirements, control interface
and control philosophy, see "Main circuit breaker engineering guideline"
(3BHS125149 E50).
2.7.3

Maintenance recommendation

The MCB trip circuits should be checked once per year.
3BHS799208 E01 REV E ACS5000 WATER-COOLED USER MANUAL
02 IMPORTANT SAFETY INFORMATION
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