CONTENTS:
A) I. Main Characteristics & Application
11. Technical Data
Ill. Function & Mode of Operation
I. Main Characteristics & Application:
PCE Brand Cab Activating Key Switch is developed and tested in accordance with CLW
Specification No. CLW/ES/3/0074 for employment in 3-Phase Electric Locomotive to energize
or de-energize the Locomotive. This is a 3-way rotating switch located on the driver desk of the
control panel
II. Technical Data:
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Operating Voltage
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110 V DC
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Operating Current
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1.5 A
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Withstanding Temperature
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-40°C to + 70°C
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No. of Contact
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8
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No. of Element
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4
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Code of Lock
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PATRA
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Colour Code of Key
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Red
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Weight
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0.370 Kg. (Approx)
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Maker's Brand I Origin
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PCE I INDIA
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Place of fitment
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On the driver desk of control panel
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This 3-way rotating switch has 3 modes or states of operation namely C,O & D. The uniqueness
of the switch is double interruption, obligation opening and bounce freeness of the contacts.
The switch contacts are sealed type and equipped with double contacting (H-contact) made of
H. AgNi 0.15. Their plastics consist of Glass Filled Nylon. They fulfill the fire protection standard
and are withstanding tropical condition.
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The Cab Activating Key Switch has a safety lock operated with red coloured code Key made of
speciatized material Nickel Silver to give trouble free operation of key for a longer period.
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The 3 modes or states of operation (C, 0 & D) of the Switch are as follows:
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o = Middle position when Locomotive is 'Off' condition. On that position contacts of the switch
5-6,7-8, 11-12, 13-14, 15-16 are shorted separately.
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C = Left shift position. On those position contacts 3-4, 9-10,15-16 are shorted separately.
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In the above position Electric Locomotive operate in cooling mode.
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When the temperature of the control unit of Electric Locomotive is above 60°C then by putting
the switch on "C" position, the MlR Blower & Scavenge for MlR Blower Fan is switched ON
which brings down the temperature to below 60°C. Only after that the locomotive can be
charged through control electronics.
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D = Right shift position. On those position contacts 1 - 2, 9 - 10 are shorted.
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On that position the Locomotive starts and operates at its normal condition.
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