Dear All,
I have worked on s-7 400. I have worked on Maintenance of PLC in our winder machine used to wind the reels of paper machine.The problem is that I locate the fault without PG from the Hard copies of the logic but I cannot locate the flag inputs or the soft I/Os generated by...
Dear All,
We have another option and that is to place 100 m away from guest house a transformer of 250 KVA already purchased and we have this transformer in our inventory. Then LV cable of 400 V from the MCC to be laid down upto the primary of Trafo and then on the secondary side we can get 230...
Dear Edison,
Thanx for your response.You mean that on 1 phase there should be 33A load.Also the budget for overhead line will be far more we have in our mill already 11 KV cable trench which is going from our Grid Station to the Main Distribution HT Room. The distance between Grid Station and...
Dear Zaza,
Yes Our Senior Person helped us and we found that CTs were not Ok. So we used the CT of another HT motor. While its CTs were placed on order.Vacuum Pump is now running while the other HT motor is stopped due to process people does'nt need that motor in their process and they will run...
Dear skogsgurra,
How Encoder supervision can active? Also this problem should be related with master/drive link. In my opinion if master is ok then follower should follow the speed reference and there should not be any replacement of Encoder.
Best Regards,
Dear Scotty,
The load of the guest house is approximately 100 A. The voltage used there is single phase 230Vac.The disturbance or the voltage variation is about 35Vac. It means the voltage normally in the guest house is 195Vac.Normally the lights and AC trip on this voltage level because they...
Thanx skogsgurra. We are using ABB Sectional Drives and Individual drives. Our drives are ACS 800. Firmware version is 7.1. These sectional drives have the fibre optic link with the central server room. While we are using 3 controllers AC800M for their communication with DCS.Encoders are already...
Dear 1000V,
Now the situation is under control. We have changed the Earth settings also the new CTs have been ordered. They will reach our mill in 1 months time. I am working in Bulleh Shah Paper Mill Kasur Pakistan. They have their one mill at Lahore Pakistan named Packages Limited Lahore.
Dear All,
We have a guest house in our Paper Mill where a lot of variation of Voltages occur. So now we decided to place a transformer there which will have its input feeder from our existing Transformer room about 1.5 KM away from the Guest House. The cable will be armoured XLPE 11 KV. Kindly...
Dear All,
We have 8 AC Drives on 3 Rolls in our Press Section of Paper Machine which are arranged in Master/Follower fashion. These are divided in 2 groups comprising of 4 per group.
Yesterday we faced a surprising situation that 1 of the drive in first group was showing its RPM 10 meters/min...
Dear All,
We have connected our whole MCC panel with profibus including constant speed and variable speed motors. Today I have found that about 20 motors were giving communication problem. When these were reset they became ok. But this kind of problem frequently occurs with 2 or 3 motors giving...
Dear All
I am working in Pulp and Paper Mill where we have vacuum system comprising 3.3 KV vacuum pump- motor combination. These are tripping frequently with IE>> fault(Earth Fault). Kindly help if there is any CT fault.
Dear All,
I am working in Pulp and Paper Mill. We have Honeywell QCS that is showing a lot of variation in grammage and moisture and also its link normally goes down without giving any alarm. Also MD control does'nt work at Automode. Process people normally use manual mode for controlling the...
