centrecipew
31-07-2010, 11:21 AM
:rolleyes:Hi All,:confused:
I need some help Please!!
I currently working on a York Screw Chiller YR series 150 with water cooled condenser and Flooded Evaporator. It has a large Frick Semi Hermetic.
I work for another Manufacturers service Dept and have access to the York Bulletins etc. Amazing what a cup of Tea gets access to!
The chiller suffered a Melt Down in the Motor terminal box.
Now that all the Motor Terminals, Leads and Links have been replaced I have re-energised the control circuit and have an instant "Phase A SCR Shorted" Message on the Optiview Panel.
I have followed the "York" bulletin test instructions to the letter and still am not able to make a conclusive decision as to wether the fault is in fact a faulty SCR or the LCSSS Logic Board.
All recorded "Gate" tests show the resistance values to be within expected Tolerances.
All tests carried out have been done at the panel with the motor leads disconnected using a Fluke77 Digital Meter. Can I use a "Megger" across T1-L1 @250v to check the SCR is Shorted?
The motor windings are Balanced and Continuos and have 1000Ohm resistance to Earth at 500v. Working on this unit until now has been a pleasure, it seems really well put together. It`s sister chiller was saved from a similar meltdown by removing the Self Amalgamating tape at the terninal studs and a Re-torquing. First time in 6 years! And yes they were not much more than Hand Tight!! We have only just got the maintenance on these units.
Any thoughts and suggestions of a technical nature would be greatly appreciated.
Thanks,
Rob
PS: York Parts Department here in UK have been really helpfull and organised!!
I need some help Please!!
I currently working on a York Screw Chiller YR series 150 with water cooled condenser and Flooded Evaporator. It has a large Frick Semi Hermetic.
I work for another Manufacturers service Dept and have access to the York Bulletins etc. Amazing what a cup of Tea gets access to!
The chiller suffered a Melt Down in the Motor terminal box.
Now that all the Motor Terminals, Leads and Links have been replaced I have re-energised the control circuit and have an instant "Phase A SCR Shorted" Message on the Optiview Panel.
I have followed the "York" bulletin test instructions to the letter and still am not able to make a conclusive decision as to wether the fault is in fact a faulty SCR or the LCSSS Logic Board.
All recorded "Gate" tests show the resistance values to be within expected Tolerances.
All tests carried out have been done at the panel with the motor leads disconnected using a Fluke77 Digital Meter. Can I use a "Megger" across T1-L1 @250v to check the SCR is Shorted?
The motor windings are Balanced and Continuos and have 1000Ohm resistance to Earth at 500v. Working on this unit until now has been a pleasure, it seems really well put together. It`s sister chiller was saved from a similar meltdown by removing the Self Amalgamating tape at the terninal studs and a Re-torquing. First time in 6 years! And yes they were not much more than Hand Tight!! We have only just got the maintenance on these units.
Any thoughts and suggestions of a technical nature would be greatly appreciated.
Thanks,
Rob
PS: York Parts Department here in UK have been really helpfull and organised!!