|Model||A1C A2C A3C|
B1C B2C B3C
|Power||Up to 540 kW|
|Voltages||Up to 690 V|
|Frame||63 ÷ 355|
|Poles||2, 4, 6, 8, 10 and 12|
|Cooling||IC 411 as standard|
IC 416 and IC 418 available as option
|IP||IP 55 as standard|
IP 56, IP 65 or IP 66 available as option
|Enclosure||TEFC MOTORS – Totally Enclosed Fan Cooled|
|Main Applications||Air conditioning, Compressors, Manufacturing processes, Metals, Mining, Power, Pulp and paper, Sugar mill, Water pumping and treatments|
2Up to 450
4Up to 450
6Up to 355
8Up to 315
10Up to 160
12Up to 132
2Up to 540
4Up to 540
6Up to 426
8Up to 378
10Up to 192
12Up to 158
HousingMotors from size 63 to 180 are made in aluminum or cast iron.
Starting from frame 200 and up to 355 the frame is in cast iron only.
(EN 1561-GJL – 200)
ShieldMade of aluminum for aluminum motors.
Made of grey cast-iron (EN 1561 – GJL 200) for cast iron motors.
Cylindrical shaft with key.
MaterialThe table below, show the materials used on the mechanical components for standard motors.
FRPP* Flame Retardant Polypropilene
|Main terminal box||
Main terminal boxMounted on top and made of aluminum or cast iron depending from size.
Degree of protection of standard terminal box is IP 55.
Cooling SystemIC 411 as per IEC60034-6
Totally enclosed standard motor, frame surface cooled with fan
4: Frame surface cooled
1: Self circulation of primary coolant
1: Self circulation of secondary coolant
On request for variable speed application an external ventilation unit can be supplied to get the IC 416 cooling type.
Also IC 418 ventilation (ventilation provided by air flowing from the driven system) is available on request.
|Degree of protection||
Degree of protectionMotors are supplied in IP 55 as per IEC60034-5 (IP 56, IP 65 or IP 66 available on request)
MountingMounting and positions are defined according to IEC 60034 - 7
See complete list on Industrial motors catalogue.
Antifriction bearings grease lubricated (ball or roller type).
The theoretical lifetime of bearings, L10h according to ISO 281/1 standard, of standardhorizontal construction motors, without external forces (radial and/or axial) is in excessof 50.000 hours.
On request, the lifetime of bearings, L10h can be in excess of 100.000 hours.
Locating bearings are on the D-End side and floating bearings on the ND end side.
On request special bearings are designed where high radial and axial forces are applied.
The motors ≤ 132 frame size have double screen prelubricated ball bearings.
The motors from 160 to 180 frame size have single screen prelubricated ball bearings.
The correspondent grease life under normal operating conditions for a motor with horizontal shaft, at 50Hz and maximum ambient temperature of 40°C is
The motors from 280 frame size and above have regreasable bearings (with greasenipples Tecalemit UNI type) and the relative exhausted grease drainage.
For initial charge of standard motor bearings a grease with mineral oil as basic oil and lithium soap as thickener, NLGI consistency grade 3, is used.
Motors for unfavourable operating conditions can be lubricated with special grease.
The name plate indicates the type of grease, the quantity and the relubrication intervals.
Impregnation systemVPI with an epoxy resin.
Insulation systemLow voltage
Stator: F class insulated with a synthetic enamel.
(H class insulation available on request)
Protective treatmentsExternal surfaces
The surface treatment categorization of motors is based on the ISO 12944 standard.
ISO 12994-5 divides paint system durability into three categories: low (L), medium (M), and high (H).
Low durability corresponds to a lifetime of 2-5 years, medium to 5-15 years, and high durability to over 15 years.
The durability range is not a guaranteed lifetime. Its purpose is to help the owner of the motor plan for appropriate maintenance intervals. More frequent maintenance may be required because of fading, chalking, contamination, wear and tear, or for other reasons.
The painting treatment of motors in standard configuration is in accoordance to C1 low corrosivity category which is suitable for indoor atmospheres (Heated buildings with a clean atmosphere).
Motor endwindings can be tropicalized with an insulating enamel to prevent motor corrosion due to humidity and aggresive substances. The standard configuration offers the following solutions:
Aluminum motors can be supplied with tropicalization on request.
GroundingMotors in standard configuration are provided with the following grounding terminals:
C1 | Configuration 1 : n°1 terminal in main terminal box
C2 | Configuration 2 : n°2 terminals, one inside the terminal box and one outside
Condensation drainageWhen installed outdoors or used for intermittent work in environments with high humidity levels, motors must be provided with holes for condensation drainage.
In order to assure the correct positioning of the holes the operating position of the motors must be specified.
Motors with frame sizes from 280 to 355 have holes for condensation drainage as standard.
Motors can be supplied with drainage holes on request.
Anticondensation heatersMotors subject to atmospheric condensation, either through standing idle in damp environments or because of wide ambient temperature variations, may be fitted with anticondensation heaters.
Anticondensation heaters are normally switched on automatically when the supply to the motor is interrupted, heating the motor to avoid water condensation.
They are normally mounted on D-End winding heads.
Normal feeding voltage is 220//230/240V.
Motors can be supplied with anticondensation heaters with terminals in main terminal box.
The power values normally used are shown in the table below:
Thermal protectionsStandard magnetothermal circuit brakers are sufficient to suitably protect the motor from overloading.
Anyway the motors can be supplied with additional thermal protections with the characteristics described in the following table.
Motors from 160 frame size are supplied with N. 3 PTC with terminals in main terminal box, in standard configuration.
Motors from 160 frame size can be supplied with PT100 thermal detectors on the bearings on request.
ListOptions and configurations
Options available are listed below. Please note some options cannot be selected together.
(1) Optional for aluminium motors, standard for cast-iron motors
(2) Optional for 160-250 sizes, standard for 280-355 sizes
(3) Optional for 160-355 sizes, standard for 355K motor sizes
s = standard
o = optional
x = contact Marelli Motori
n/a = not available
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