Recent content by vmac100

The batteries are four years old.

Thanks Gunnar. However, we are using contactors of the same specifications on a pump with the same specifications and it has not gotten burnt or welded. Any take on that?

Good day all. I have a bank of batteries (165pcs) serving my 150kVA HITEC rotary UPS. This machine has been down for a while, but the batteries were being charged through the rectifier. Yesterday, one of the batteries exploded. What I have done right now is to remove the rectifier from service...

Dear all, I have a 3phase, 400V, 75kW FLYGT pump used in wtare storm water evacuation in our office area. The pump starts on star and runs on delta.We have been having issues with the contactor controlling the pump. The contactor is manufactured by TELEMECHANIQUE and has the following name plate...

yes I have and I understand that some security problems (real and artificial as well) are preventing them from coming and still won't even send me the cost for the parts.

Happy new year guys. Gr8 work going on here. Please I need information on service engineering firms and parts for PILLER'S UNIBLOCK 300kVA static UPS. All information will be useful

Thanks Stardelta I am particularly interested in getting the DC motor carbon brushes with part No. EG389-P and special frequency meter. Any hope? Thanks

Dear All, in my company, we have three units of 150kVA rotary UPS with the following name plate parameters: UNINTERUPTIBLE POWER SUPPLY TYPE NR : ANB 150kVA SERIAL NR : 128358-01, 128358-02 & 128358-03 YEAR : 1988 MANUFACTURER : HOLEC HOLEC NR : 160095 POWER : 150kVA POWER FACTOR : 0.8...

Good day Gents, please I need some information here. There is a differential protection system for our 33kV/11kV 12MVA transformer.However, due to the difference in the ratings of the CTs on the primary and secondary sides, an INTERPOSING CT is used used to tie in the secondary side CT to the...

Sorry, I had to take some time off. DPC, the machine started this behaviour recently

Gents, please I need some reliable specs and manufacturers for the following: 1. 1000-500kVA, 3-PHASE, 415V, 50HZ Voltage stabilizers. 2. 1000-500kVA, 3-PHASE, 415V, 50HZ Frequency regulators. I require the output voltage to be 415V +/- 1% and the output frequency 50Hz +/- 0.2%. I have some...

DPC, thanks for the reply. It didn't just started this behaviour. The machine has been down though functional as it was not possible to synchronize it unto the vital load busbar with the other machines. And when it was eventually done, it dropped the load. However, as at yesterday, it stopped...

Gents, I have a 150kVA HITEC rotary UPS that when synchronised to the busbar with another machine of the same make and rating does the following: 1. Takes up a large proportion of the connected load. 2. Pulls all the load to itself. 3. Drops the load and starts running on high frequency. Do you...

Hi guys, does any one have a soft copy of the maintenance routines for caterpillar diesel gensets (500kVA and above)? please let me have it. Regards

Good day guys, i do hope we are all hail and hearty here. i am not and you know why: an IPM, Balanced power plus 225kVA 3-phase static UPS machine that has refused to stop making an annoying and rising humming sound when switched on and loaded, forcing me to shut it down for fear of damage to it...