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Re: Identification Of Pull Chord Switch
Normal practice today is to annunciate switches with double throw contacts, one for shutdown and one for annunciation in the PLC such as the frequency shift key type. THere are variations of this for above and below ground use.
There are light annuciations and flag annunciations which rotate into the field of view on activation with many variations. ■
Re: Identification Of Pull Chord Switch
Hello Rekhawa
Here in South Africa we use two types of pull cord system:
- Intelligent which we use for long systems
- Unintelligent which we use for short systems.
The unintelligent ones are cheap simple ones with the flag which pops out of the trip switch that has been pulled, as you describe.
The intelligent ones have a flag as well as a red light on the trip switch if it has been pulled, as well as a display unit in the MCC room that tells you if indeed it was a trip switch or a mis-alignment switch or belt rip or whatever, which one where and when.
This information is also relayed to the control room.
A supplier of intelligent systems here is CT Systems
Regards
LSL Tekpro ■
Re: Identification Of Pull Chord Switch
Dear Graham Spriggs,
The intelligent switches, you described is exactly the one I was looking for. I have not come across any such switches.
Can somebody suggest a supplier in India for this type of switches?
Reagrds ■
Indicating Lamp For Pull Cord
Dear Mr. Rekhawar,
Resently, I used LED type indicating lamp for indentification purpose in TATA STEEL. The Indian supplier are as below;
1. JAYASHREE, PUNE
2.JAYBALAJI, VILLAI
3.TECHNO CRAFT,KOLKATA
But I am not satisfied with the performance.
Regards.
A.Banerjee ■
Re: Identification Of Pull Chord Switch
Dear sir,
we have intelligent pull chord switch and other conveyor field protection devices,
you can visit our factory
AG SYSTEM CONTROLS
303 MAHIM INDUSTRAIAL ESTATE
MORI ROAD MAHIM MUMBAI-16
TEL 24464719,24457769,56548612
agswitch@vsnl.com ■
Pull Chord Switch
Dear sir
long distance conveyor we devide total conveyor length in to small zones consisting of about 500 m length each .
Each zone will be having swiches at a distance of 50 m. Switches of each zone will have seperate circuit.
In case any pull chord switch is operated zone no of that perticular switch is annunciated at plc panel.
In field we have red lamp provided on each zone . in addition each pull chord switch have red lamp.
in case of particular pull chord switch is operated red lamp in the field of that zone along with lamp of swich will be operted.
This way it is very easy to locate operated pull chord switch
A R SINGH ■
Identification of Pull Chord Switch
Dear all,
In a long conveyor in Yard or in Gallery, if conveyor trips due to operation of Pull Chord Switch, it takes long time to locate the switch, which has been operated.
This leads to loss of critical operation hours.
Do we have a pull chord switch with a small indication lamp which glows red or green as per the status?
Regards ■