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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...

Thanks Gents, I am really very grateful for your input. Yesterday, and in continuation with my troubleshooting activities, I carried out an offline load test on the unit using a resistive load bank. The unit passed with flying colours, with loads/phase getting as high as 171A without the unit...

Hi Rbulsara and my other good friends, I am really grateful for all the help you have rendered so far with regards to my malfunctioning UPS. However, I will have to crave your indulgence and ask for more assistance from you. Yesterday, I followed the advice given by Rbulsara and had the load...

Rbulsara, thanks again for your effort. Each UPS unit feeds four office buildings, and these loads are added together at the same time by closing the output circuit breaker.that's what i meant by 'when we connect load to the units'. what you suggested that a copier or printer should not affect a...

Thanks guys. there is this fear that there may be laser printers, photocopiers, etc connected as load to the UPS output. I plan on carrying out a load rationalization within the next few days. Also, the UPSes are not new, and have been in use for some years.First line maintenance has been...

Gents, i have two International Power Machines' BlancedPower Plus, BP+225, 225kVA UPS machines that are presently malfunctioning. We obseved that when the units are started, the start process is okay, showing 'UPS NORMAL' on the indicator. However, when we connect load to the units, they...