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Yellow Alarm light on Temperature Controller

PROBLEM


Yellow Alarm light is lit on 409.83 Temperature Controller (Figure 1).

 

Figure 1 –  409.83 Alarm Indicator Active

 



ANSWER


This could be caused by a possible interlock condition somewhere. Check the Station Manager message-pane window to see if it shows the cause of the interlock (Figure 1). 



Figure 1 – Station Manager Message Pane Window

 


 From pages 28-29 of the attached manual:

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Figure 2 – Eurotherm 2216 temperature controller Indicators

 


Note:  You could have more than one cause for the alarm light so clearing interlocks warnings in Station Manager may not fully resolve the yellow alarm light.  

 

If the temperature controller is not connected to an MTS controller, check that the jumper is installed on P6 connector (Figure 3).    



Figure 3 – Temperature Controller P6 Jumper Plug Pinout

 


If the temperature controller is connected to an MTS controller and you have not found any warning messages in the Station Manager message log indicating the cause of the interlock or clearing those warnings didn’t fully resolve the problem, then check the cable coming off the P6 connector for a part number.  If the part number is 577045-XX you can reference the drawing below to continue troubleshooting (Figure 4).  Otherwise you will need to obtain the cable drawing for your cable part number to troubleshoot further.  



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Figure 4 –CABLE-409.83 TO 494.42/44 to grip cooling kit

 

 

This cable runs between the MTS controller and grip cooling kit.  The interlock circuit is on pins 6 and 7 and goes through two grip flow switches and the high temperature extensometer.  If there is a break in any of them, the circuit will be open and cause an interlock.  Jumper across pins 1 and 2 on the 9 pin connectors of the cable, testing each, one at a time (Figure 5).  



Figure 5 – Jumper across pins 1 and 2 using 22 AWG wire

 

 

For example, if the first switch is bad, and you put a wire across pins 1 and 2 on that connector and the interlock clears, you will know the problem is in that flow switch part of the circuit.  If it doesn't clear, test the next one until you find out which section has the open in the circuit.  

 

Also, jumper all three D-9S connectors on the cable at the same time. If the interlock is still present with all three connectors jumpered then the problem is before the flow switches and extensometer.    

 

Below is the circuit drawing for the flow switch (Figure 6).  When the coolant flow is adequate it will close the switch satisfying the interlock circuit.  If there is not enough coolant flow to actuate the switch or the switch is faulty it won't close.  By jumpering the pins on the cable side, you are bypassing each switch or extensometer to find out which one is causing the open in the circuit.  

 

If you are getting coolant flowing through the lines but the switches are not closing it may not be bad switches. It could be that the coolant flow is not enough to actuate the switches.   It could be something like hard water build up or contamination of the lines.  Try flushing the lines or increase the water flow.  

 

 

Figure 6 - The lower grip flow switch assembly (PN 057-704-702) is item 0016 in the bill of materials below. 

 

 

 

Bill of Materials For: 057-697-501 - WATER COOL ASSY-GRIP/FXTR,UNIV, 0 HOSE

 

The switch by itself (PN 100-255-513) is item 0001 in the bill of materials below. 

 

Bill of Materials For: 057-704-702 - WIRING ASSY-FLOW SWITCH,LOWER GRIP

 

 


Figure 6 – Image of part number 100-255-513 Switch-Flow, ½GPM with Q/D

K
Keary is the author of this solution article.

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