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FEATURES
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Simple, rugged construction. |
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Coils made from high
grade CRGO Silicon Steel & 99.9% pure copper. |
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Output voltage variation
is smooth, continuous, breakless & linearly proportional to angular rotation. |
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High efficiency. |
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Negligible waveform
& power factor distortion. |
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Excellent short time
overload capacity. |
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Remote operation possible
by motorization. |
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Wide range of current
ratings. |
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High quality carbon
brush used for current collection. |
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ELECTRICAL SPECIFICATIONS |
• MODEL |
a) Flush Open Manual (Air Cooled) — F |
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b) Portable Enclosed Manual (Air Cooled) — P |
c) In Tank Manual (Oil Cooled) — T
'F', 'P', T suffixed by 'M' means motor operated models. |
• OPERATING VOLTAGE |
For Single Phase - 240V AC, 50-60 Hz. 1- ph. |
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For Three Phase - 415V AC, 50 -60 Hz., 3 - ph - 4wire. |
• CURRENT RATINGS |
For Oil Cooled models, maximum current & continuouscurrent are one & the same. |
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For Air Cooled models, the ratings are as shown below. |
Maximum Current |
0.7 |
2 |
4 |
8 |
10 |
15 |
20 |
28 |
Continuous Current |
0.6 |
1.8 |
3.8 |
6.5 |
9 |
11.5 |
16 |
22 |
• OPERATING TEMP. |
0° - 45°C. |
•INSULATIONRESISTANCE |
Not less than 5 Mohms at 500V DC. |
• DIELECTRIC TEST |
2.5kV RMS for 1 minute. |
• STORAGE TEMP. |
-9°C to 70°C |
• HUMIDITY |
Upto 95% RH |
• CONFORMS TO |
I.S. 5142. |
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Notes |
1 |
As output voltage is continuously variable, Dimmers are rated in terms of current that can be drawn from the output. |
2 |
Oil should be "Transformer Oil" conforming to IS 335, IEC 296. |
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MECHANICAL
CONSTRUCTION |
| Single
phase Dimmers are available in 3 types. |
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Portable type (P)
with sheet steel enclosure for floor / table use. |
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Flush type (F) with
open type construction. Suitable for panel mounting. |
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Tank type (T) immersed
in oil in sheet steel tank with rollers. |
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Three phase Dimmer is usually ganged assembly of 3 coils, available in all 3 types: P, F, T.
Higher rating Dimmer (above 200 Amps) use 2/3 or more coils in parallel with load balancing arrangements.
Motorised Dimmer uses 240V AC Step-Syn Motor having 60 rpm speed at 50Hz. With proper gearing higher torque at lower speed can be achieved.
Standard gear ratios used provide sweep time of 8, 15, 30, 45, 60,120secs. |
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APPLICATIONS |
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Auditorium, Hotels, Conference Halls, Exhibitions, Laboratories etc., |
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AC Voltage Stabilizers, Rectifiers, Battery Chargers. |
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Temperature control of Ovens, Furnaces. |
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Testing of Instruments, Relays, Circuit Breakers etc. |
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Welding, Electro-plating, Anodizing etc. |
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Colleges & Universities. |
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Ordering
Information
(as per code specified below} |
| 1st block |
Output current
rating amps |
0.7,2,4,8,10,15,20,28,40,50,60,75,100,125,150,
200,300,400, 500,600,800,1000,1200,1500 A. |
| 2nd block |
Dimmer (D) |
Continuously variable
voltage auto transformer. |
| 3rd block |
No. of coils |
1, 2, 3, 4, 6, 9, 12,
15. |
| 4th block |
Type of construction. |
F, P, T
F = Flush, back of panel open.
P = Portable, floor, table mounting, air cooled with enclosure.
T = In tank, immersed in oil. |
| 5th block |
Provided with
motor drive (M) |
"Step-syn"
230V 1Ph AC 50Hz. 60 rpm motor having instantaneous start-stop-reverse characteristics. |
| 6th block |
Approx. time in secs.
for full rotation sweep time |
8,15,30,45,60,120
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| e.g. |
1 |
2 |
3 |
4 |
5 |
6 |
75
A Dimmer with 3 coils (Three phase) in oil-cooled
tank construction with motor drive having 15 sec. sweep. |
| 75 |
D |
3 |
T |
M |
15 |
|
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| e.g. |
1 |
2 |
3 |
4 |
8
A Dimmer with 1coil (Single phase). Portable type &
suitable for manual operation (no motorisation) |
| 8 |
D |
1 |
P |
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Simiarly, other Dimmers can be configured & ordered. |
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