ABB +Q957 사용자 설명서 - 페이지 15

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Option description 15

Option description

Contents of this chapter

This chapter describes the option +Q957, prevention of unexpected start-up, and its settings.

Overview

The option +Q957 uses a safety relay to implement the Prevention of unexpected start-up

(POUS) safety function. ABB installs the safety relay to the drive at the factory.

The user must install and connect an operating switch and an indication lamp (optional) on

site. These are not included in the delivery. The user can install the operating switch on, for

example, a control desk. See the machine-specific C-type standards on whether the indication

lamp is required.

When the user sets the operating switch to the open position, the POUS function activates

the Safe torque off (STO) function in the drive. The Safe torque off function disables the

control voltage of the power semiconductors of the drive output stage. This prevents the

drive from generating the torque required to rotate the motor. With the POUS function, the

user can do short-time operations (like cleaning) or maintenance work on the non-electrical

parts of the machinery without switching off and disconnecting the drive.

Note: The situations in which you can use the POUS function must always be based on a

risk assessment. Refer to IEC 60204-1:2016.

Note: Drives with the Emergency stop, stop category 1 function (option +Q952 or +Q964):

If the user activates the POUS function during the emergency stop deceleration ramp, it

overrides the emergency stop function. This activates the drive STO function immediately

and the motor coasts to a stop. For more information on the emergency stop function, see

the applicable user's manual.