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IEC 60947-6-2-2020 pdf free download
IEC 60947-6-2-2020 pdf free download.Low-voltage switchgear and controlgear — Part 6-2: Multiple function equipment — Control and protective switching devices (or equipment) (CPS)
Appareillage a basse tension — Partie 6-2: Matériels a fonctions multiples — Appareils (ou materiel) de con nexion de commande de protection (ACP).
5.4.3 Application of utilization categories for motor control duty Typical service conditions are:
— rotation in one direction, the motor being switched off while running under normal service conditions (utilization categories AC-2, AC-3 and AC-3e);
— rotation in two directions, but running of the motor in the second direction being started only after the CPS has been switched off and the motor completely stopped (utilization categories AC-2, AC-3 and AC-3e);
— rotation in one direction, or in two directions as in the previous paragraph, but with the possibility of infrequent inching. For this service condition, a direct-on-line CPS is generally used (utilization category AC-3 and AC-3e);
— rotation in one direction with frequent inching (jogging); a direct-on-line CPS is generally used (utilization category AC-4);
— rotation in one or two directions but with the possibility of infrequent plugging in order to stop the motor, the plugging being associated with rotor resistor braking if this is provided. In this case a CPS may be used in the stator circuit (utilization category AC-2);
— rotation in two directions but with the possibility of reversing the supply connections to the motor while it is running in the first direction (plugging), in order to obtain its rotation in the other direction while switching off the motor running under normal service conditions. A direct-on-line reversing CPS with plugging capability is generally used for this service condition (utilization category AC-4).
Unless otherwise stated, CPS’s used as starters are designed on the basis of the starting characteristics of the motors compatible with the making capacities of Table 9. When the starting current of a motor exceeds these values, a CPS having a suitably higher rated operational current should be used.
5.5 Control circuits
Subclause 5.5 of IEC 60947-1:2020 applies with the following additions.IEC 60947-6-2-2020 pdf free download.
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