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ABB DSDX453 remote input/output base unit

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 mini mum require-ments are met. The minimum

requirements for the MCB are stated in this note

and in the respective MCB specifications, 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 Safety of machinery - Safety related parts of control systems - Part 1: Gen eral principles for design, section 6.2.6 Cate gory 3

• IEC 60204-1 Safety of machinery - Electrical

equipment of machines - Part 1: General

requirements

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 certi fied to meet SIL 3 level requirements, and to ful fill the timing requirements outlined below.

Opening of the MCB by the drive must be possi ble at any time. It is not permitted to interrupt

the open and / or trip command, for example 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 specifica tions. Typical maximum values for the drive are

defined as follows:

- Maximum protection trip time: 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 fur ther damage to the drive, eg, diode failures.

- Maximum safety trip time: 250 ms

The maximum safety trip time is the maxi mum allowed time to ensure safe disconnec tion of the main power supply to prevent any

hazard to personnel.

In order to meet the stipulated safety require ments, it is recommended that:

• the MCB is equipped with two independent

opening coils, or

• the MCB is equipped with one opening coil and

an undervoltage coil for monitoring of the con trol voltage, or

• an upstream protection coordination scheme is

provided which uses the "breaker failure" (ANSI

50BF) signal to automatically trip the upstream

breaker, in case the MCB does not open. The

upstream breaker must open within the maxi mum safety trip time after a failure has

occurred.

Safety instructions are used to highlight a potential hazard when

working on the equipment. Safety instructions must be strictly

followed! Non-compliance can jeopardize the safety of personnel, the

equipment and the environment.

The safety instructions are derived from the following standards:

• ISO 3864-2:2004 (E)

Graphical symbols – Safety colours and safety

signs – Part 2: Design principles for product

safety labels

• ANSI Z535.6

American National Standard for Product Safety

Information in Product Manuals, Instructions,

and Other Collateral Materials

DANGER !

DANGER indicates a hazardous situation which, if

not avoided, will result in death or serious injury.

WARNING !!

WARNING indicates a hazardous situation which, if

not avoided, could result in death or serious injury.

CAUTION !

CAUTION indicates a hazardous situation which, if

not avoided, could result in minor or moderate

injury.

NOTICE

NOTICE is used to address practices not related to

personal injury

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