Page 989 - ABB_Motor _Protection_and_Control_catalogue_20221216

ABB MOTOR PROTECTION AND CONTROL 10/15

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Terms and technical definitions

Circuits • AC operated contactors and contactor relays...
• auxiliary circuit: All the conductive parts of a contactor de- voltage sag: an rms reduction in the AC voltage, at the power
signed to be inserted in a different circuit from the main cir- frequency, for durations from a half cycle to a few seconds.
cuit and the contactor control circuits. The IEC terminology for this phenomenon is voltage dip.
• control circuit: All the conductive parts of a contactor (other
than the main circuit and the auxiliary circuit) used to control voltage sag immunity: the ability of equipment to withstand
momentary electrical power interruptions or sags.
the contactor's closing operation or opening operation or both.
• main circuit: All the conductive parts of a contactor designed
to be inserted in the circuit that it controls. Coordination of protections against short circuit
The goal here is to protect electromechanical starters and soft-
Thermal overload relay tripping classes starters.
IEC 60947-4-1 defines tripping classes 10 A, 10, 20 and 30. Types Any starter is designed to:
10 A, 10, etc. correspond to the maximum tripping time for a • start motors,
making current at 7.2 times the setting current. • ensure continuous functioning of motors,
Furthermore, for each class the standard specifies the tripping • disconnect motors from the supply line,
time for 1.5 times the setting current and sets the non tripping • guarantee protection of motors against overloads.
condition at 1.05 times the setting current. The starter is typically made up of a switching device (contac-
All these data are summarized in the table below. tor) and an overload protection device (thermal overload relay
Extract from IEC 60947-4-1: or electronic overload relay). These two devices MUST be coor-
dinated with equipment capable of providing protection
Tripping class 10 A 10 20 30 against short circuit (SCPD: short circuit protective device): typ-
Max. tripping time for 1.5 times ically a circuit breaker with magnetic release only or a switch
the setting current (warm state) s 120 240 480 720 fuse. These are not necessarily part of the starter.
Tripping time for 7.2 times The characteristics of the starter must comply with the interna-
the setting current (cold state) s 2 - 10 4 - 10 6 - 20 9 - 30 tional standard IEC 60947-4-1 which defines the above items as
For 1.05 times the setting current No tripping follows:
contactor: a mechanical switching device having only one posi-
tion of rest, operated otherwise than by hand, capable of mak-
Electromagnetic compatibility ing, carrying and breaking currents under normal circuit condi-
AF... contactors comply with IEC 60947-1, 60947-4-1 and tions including overload conditions.
EN 60947-1, 60947-4-1 standards. overload release: overload relay or release which operates in the
Definitions: case of overload and also in case of loss of phase.
Environment A: "Mainly relates to low-voltage non public or in- circuit-breaker: defined by IEC 60947-2 as a mechanical switch-
dustrial networks/locations/installations (EN 50082-2 article 4) ing device, capable of making, carrying and breaking currents
including highly disturbing sources". under normal circuit conditions and also making, carrying for a
Environment B: "Mainly relates to low-voltage public networks specified time and breaking currents under specified abnormal
(EN 50082-1 article 5) such as residential, commercial and light circuit conditions.
industrial locations/installations. Highly disturbing sources IEC publication 60947-4-1 defines coordination types "1" and "2":
such as arc welders are not covered by this environment". • Type "1" coordination requires that, in the event of a short-cir-
Notice for AF09…AF2650 contactors: cuit, the contactor or starter does not endanger persons or in-
• AF09 … AF38 contactors and NF contactor relays (produced stallations and will not then be able to operate without being
repaired or parts being replaced.
since week 08-2013), AF40 ... AF96 contactors have been
designed for environment B. • Type "2" coordination requires that, in short-circuit condi-
• AF09 … AF38-..-..-12 contactors and NF..E-12 contactor relays tions, the contactor or starter does not endanger persons or
installations and will be able to operate afterwards. The risk
(48...130 V 50/60 Hz-DC), AF116 ... AF2650 contactors: these
products have been designed for environment A. of contacts being light welded is acceptable. In this case, the
Use of this product in environment B may cause unwanted manufacturer must stipulate the measures to be taken with
respect to maintenance of the equipment.
electromagnetic disturbances in which case the user may be
required to take adequate mitigation measures. IEC coordination tables are displayed for IE1, IE2, IE3 and IE4
Note: for 48...130 V 50/60 Hz-DC in environment B, motor efficiency classes in regards with N/H or NE/HE motor
AF09Z … AF38Z-..-..-22 contactor or NFZ..E-22 contactor design use.
relays can be selected.
International Efficiency (IE) classes for single speed
Definitions according to SEMI F47-0706 electric motors
SEMI F47-0706 defines the voltage sag immunity required for IEC 60034-30-1:2014 standard defines four International Effi-
semiconductor processing, metrology and automated test ciency (IE) classes for single speed three-phase cage rotor in-
equipment, and on subsystems and components which are used duction motors designed for operation on sinusoidal voltage:
in the construction of semiconductor processing equipment in- - IE4 = Super premium efficiency
cluding but not limited to: - IE3 = Premium efficiency
• Power supplies - IE2 = High efficiency 14
• Generators - IE1 = Standard efficiency
• Robots and factory interface
• Chillers, pumps, blowers