A series of unfortunate events could lead to a situation where the machine is not 100% protected if operators are not paying attention to alarms because they are busy elsewhere.
Briefly explained this is what could happen:
In the regular mode of operation, the chamber is protected by relays which trigger if the temperature is too high. These relays are supplied by a 24V DC. If the 24V DC supply is damaged or interrupted or the PLC is switched off, which should be noted by the operator but for some reason is not, this could lead to an uncontrolled situation which means that the heating process will not be stopped automatically. So, if the heating process is not stopped manually within a reasonable time then the machine might heat up until either the heater rods blow or until the motor protection switches trigger.
The same kind of damage could also happen if one of the overtemperature relays is broken.
Through our research we have been able to come up with a solution which will prevent all these kinds of failures. The retrofit includes different hardware parts which will switch off the heaters should the 24V power supply fail or if the overtemperature protection relays are broken. A software modification is not required.
So, briefly summarized you will not have:
- broken belts
- molten yarn
- broken heater rods
as a result of overtemperature in the chamber anymore.
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This retrofit is available for all thyristor controlled GVA’s. Please talk to us if you are interested in this retrofit and we will gladly provide you with a quotation for your machine.