CraigF
26-02-2015, 11:32 AM
Gents,
I have a site where a brand new puhz p125yha has been installed. 3 phase unit, supply on site is stepped down with a power perfector (you may well know which sites have these!!). Wired from the dis board in 4mm (15m cable run) evertuff. The unit ran fine on commissioning, no issues whatsoever. However after a month I am getting U9 fault. the unit will run the CFM for 2 secs and stop creating the fault.
I have gone down the usual line with Mitsi, who say categorically the supply voltage is not enough, at 391v.
The pink plug in the corner (Bussed DC, IIRC) is only reading 304vdc and needs 310vdc min for the fault not to appear.
I have been tasked with changing the cable as my superiors say the volt drop through the cable is causing this. I Have done some calcs that tell me I will only have 0.8% volt drop over this cable, which to me does not constitute a solution and we will be in the same boat after time spent on this. Personally I think 4mm is perfectly capable...
Any thoughts on this?
I have a site where a brand new puhz p125yha has been installed. 3 phase unit, supply on site is stepped down with a power perfector (you may well know which sites have these!!). Wired from the dis board in 4mm (15m cable run) evertuff. The unit ran fine on commissioning, no issues whatsoever. However after a month I am getting U9 fault. the unit will run the CFM for 2 secs and stop creating the fault.
I have gone down the usual line with Mitsi, who say categorically the supply voltage is not enough, at 391v.
The pink plug in the corner (Bussed DC, IIRC) is only reading 304vdc and needs 310vdc min for the fault not to appear.
I have been tasked with changing the cable as my superiors say the volt drop through the cable is causing this. I Have done some calcs that tell me I will only have 0.8% volt drop over this cable, which to me does not constitute a solution and we will be in the same boat after time spent on this. Personally I think 4mm is perfectly capable...
Any thoughts on this?