Thanks. It is controlled by a plc output. It seems to be controlling well. With the internal leakage of the proportional valve it is causing more cycling of the pump and motor. I am not sure what is causing the internal leakage. Can the proportional valve be calibrated to zero? the manual says...
I have a 0 to plus or minus 10 volt proportional valve that is controlling a cylinder. It is a parker D31fh type. The hydraulic pressure ranges from 1600 to 1850. The pump will start at 1600 and shut off at 1850. My problem is with the new proportional valve it cycles the pump every 4 minutes...
I have a lathe and a drill press I need to wire up. They are mounted to a concrete floor. In order to get the conduit to the equipment I will need to either cut a path in the concrete or use a flexible cord, plug, and receptacle. I cannot find where the cord option is legal according to code. I...
I am not sure about the delta wye configuration. So my current fuse ratio is roughly 3 to 1 (secondary to primary) while my turns ratio is close to 8 to 1 (primary to secondary). It could be that is what the load requires for protection. So I guess the reason it blew the primary fuse instead of...
Inrush is definitely a possibility. The fuses and fuse holders are fairly new and inside the plant. They were in good shape. I would like to understand better the relationship between the primary and secondary current draw under a load. Thanks.
Hi,
At work I noticed a phase loss from one of our transformers. After making some checks I noticed one of the three transformer primary fuses was blown. I am trying to figure out if it was due to a secondary overload, how much current it would take to blow the primary fuse, and why didn't...
Using the field voltage as a brake gradually lowers the stator voltage as the rotor rpms comes down on our horizontal units. For the past 20 years we have used a GE exciter without V/HZ protection. Recently we switched to an updated exciter with V/hz protection turned on and that tends to trip...
Hello,
I work at a hydroelectric plant that uses the field of the rotor for a brake once the unit is taken offline. As you can imagine if there is a little wicket gate leakage, it can take a long time to stop. We have had issues with the exciter tripping due to raising the voltage too...
Does anyone know of a good book or manual on static exciters and voltage regulators in general? Something to use for foundational information or teaching for most exciter configurations. Thanks for any help.
I am programming a subroutine in Directsoft 5. The subroutine scrolls through indicator lights when activated. When coming out of the subroutine, sometimes one of my indicator lights sticks on. It depends on when I flip the switch to come out of the subroutine as to which one of the lights stick...
I work at a hydroelectric plant with 6 horizontal units. Recently 2 units were rewound. The voltage rating of the stator was changed from 4000 volts to 4800 volts. There are 44 field poles on each unit which were also rewound. After they were rewound,the generators were considerably louder than...
To measure vibration on the collector rings of my generators, I am using an insulated rod touching the top of my brush rigging. The vibration monitor is the CSI 2130. My question is how man mils is normal and at what point (mils) is there too much vibration? My generator is turning at 164 rpms...
