Page 990 - ABB_Motor _Protection_and_Control_catalogue_20221216

10/16 ABB MOTOR PROTECTION AND CONTROL

—

Terms and technical definitions

Motor design N/H and NE/HE Assessed failure rate
IEC 60034-12:2016 standard defines motor design categories as Defined according to IEC 60947-5-4. This rate is given in stan-
below: dard industrial environments for the contactor relays and for
• Design N the built-in auxiliary contact of contactors.
Normal starting torque with normal locked rotor current
• Design H Load factor
High starting torque with normal locked rotor current Ratio of the on-load operating time to the total cycle time x 100.
• Design NE
Normal starting torque with higher locked rotor current
• Design HE Switching frequency
High starting torque with higher locked rotor current. Number of switching cycles per hour.
Asynchronous IE1/IE2/IE3/IE4 motors may be of the design N or H. Plugging
Asynchronous IE3/IE4 motors may be of the design NE or HE, Stopping or fast reversal in rotation direction of a motor by two
having extended/locked rotor apparent power and current than supply leads being interchanged while the motor is running.
design N and H motors.
Inching
IEC 60947-4-1 Ed.4 introduces now a new AC-3e utilization cate- Energization of a motor's circuit repeatedly or for short periods
gory for AC circuit switching and keeps the use and definition of with the aim of obtaining small movements of the driven mech-
existing AC-3 utilization category unchanged. anism.
• AC-3: Refer to the asynchronous motor of designs N and H ac-
cording to IEC 60034-12:2016
• AC-3e: Refer to the asynchronous motor of designs NE and HE, Coil operating limits
according to IEC 60034-12:2016, with extended / higher Expressed in multiples of the nominal control circuit voltage Uc
locked rotor apparent power and current than design N and H for the upper and lower limits.
respectively, to achieve a higher efficiency class according to
IEC 60034-30-1. Mounting position
AC-3e category is defined for the use and the selection of
MS116, MS132, MS165 manual motor starters, 3-pole AF09… Comply with the manufacturer's instructions. Restrictions are
AF190 contactors and B mini-contactors: please see their re- to be taken into account for certain mounting positions.
spective data pages.
Rated breaking or making capacity
Root mean square (r.m.s.) value of the current that the contactor
Rated operational current Ie. is able to break or make at a given voltage according to the con-
Current rated by the manufacturer. It is mainly based on the ditions specified by standards and for a given utilization cate-
gory.
rated operational voltage Ue, the rated frequency, the utiliza-
tion category, the rated duty and the type of protective enclo-
sure, if necessary. Intermittent duty
Duty during which the contactor is successively closed or open
Conventional free air thermal current Ith for periods which are too short to enable the contactor to
achieve thermal balance.
Current that the contactor can withstand in free air for a duty
time of 8 hours without the temperature rise of its various parts
exceeding the maximum values given by the standard. Ambient temperature
Air temperature close to the contactor.
Operating cycle or cycle
Includes one making operation and one breaking operation. Time
• Time constant: Ratio of the inductance to the resistance
(L/R = mH/Ω = ms).
Cycle time • Short-time withstand current: Current that the contactor is
This is the sum of the current flow time and the no-current time able to withstand in closed position for a short time interval
for given cycle. and in specified conditions.
• Closing time: Time interval between the coil energization and
Electrical durability the instant the contacts touch on all the poles.
Number of on-load operating cycles that the contactor is able to • Opening time: Time interval between the coil
carry out. It depends on the operational current, the operational de-energization and the instant the contacts separate on all
voltage and the utilization category. the poles.

Mechanical durability Rated control voltage Uc
Number of no-current operating cycles that a contactor is able Control voltage value for which the control circuit is sized.
to carry out.
14