@LionelHutz,
I changed the VFD setting U/F setting of VFD to 100%, i am able to drive the pump at 50 Bar.
Before the setting of U/F wass at 30%, Motor stalled when i loaded the pump to 25Bar.
But from torque sensor, it showed high Torque, but the motor current of 15 KW in my workshop was...
@Littleinch,
You mentioned earlier the total power at 50 Bar is only 2HP.
what is your insight wheb we run in VFD the power BKW is getting quadraticly high ? .
@LionelHutz.
Setting : only set for 25 KW parameter
My apologize this was typo, setting motor parameter as PER 15 kW motor 4 pole.
Sorry for the confusions
Hi All,
By changing the U/F setting of VFD to 100%, i am able to drive the pump at 50 Bar. Before the setting of UF eas at 30%.
Motor stalled when i loaded the pump to 25Bar.
My objective of this workshop test using 15 KW motor to prove that the old motor of 11 KW at 11 Hz which has been run...
Hi Jasada,
Sorey for the late reply.
Please refer to attached
https://1drv.ms/u/s!AshU1On9Vy6fiv1Uqq8m0Ck6cLSL9g
from the pump photo the motor is frame B35, however it was not bolted.
1. How many KW the motor power and RPM .
2. This normally no alignment is done since it is flanged...
Hi Jraef,
The recomennedation for 15 KW from manufacturer is Delta connection.
I also tried star,It has low current when i increases the mechanical load for rated application such as pump pressure, result motor stalled unable to drivs the pump at low pressure.
From this 3 KW above shall...
Hi Littleinch,
It has forced cooling fan so throttling it as this is membrane application where need to boost the pressure. The pump is designed for the pressure up to what i throttled.
I just trying to troubleshoot of higher current of smaller motor of 11 KW at site with the same pressure but...
Hi,
I wonder if my setting of Variable speed drive need to be fined tune for Constant torque application.
Application: 10 HZ of 15 KW 4 Pole 50 Hz
Pump: Plunger triplex at 20 LPM
Pressure: 50 Bar achieved by regulating the throttle valve with gate valve
VFD; ATV 610D
Setting : only set for 25...
Hi Littleinch,
Issue is my system pressure is throttled not gdnerated by systsm at 51 bar and the motor is overload whixh is not supposed to be.
Littleinch, i managed bring down the pump to my setup system however i am using a different 15 KW motor to test this pump actual power consumption...
Hi Littleinch,
It is Phased to Phased
UV
UW
VW
However, wondering why the current is exceeding rated current of the motor ? .
Is it normal at VFD 20%, generating flow 18 LPM 51 Bar, the power usage is greater than 11 KW ?
Using the manufacturer formula...
Hi Littleinch,
If i use fluke voltmeter.
Measured it is 38.4 Volt at 10 Hz using ac multimeter.
Below pump spec
https://www.northridgepumps.com/upload/pdfs/CAT-1540E-1540EC-1541-1541C-Technical-Specification-English.pdf
Littleinch,
Yes would do, i measured from incoming, when run on VFD, i did not measure the voltage at outgoing.
Ok would do check on this terminal phased as well.
Hi Jasada,
I encountered a similar failure of magnetic drive but it is with external gear magnetic drive.
Can you check the following
1. NPSH margin during the operation
2. Suction Pressure
3. Vibration
4. shaft Alignment
5. Keyway tolerance
In my encountered of containment can and drive...
Hi,
We have triplex pump running for sometime with VFD of 20% of 50 HZ
Cat Pump
11 KW 4 Pole motor 400 V
Maximum current 415 V is 20.2 Ampere.
We see the running current at Discharge Pressure of 51 Bar is 20.6 Ampere and at 0 Bar is 11 Ampere.
At 0 Bar to 45 Bar, the motor was running okay...
Littleinch,
It is real apllication, most of tbe diesel storage is in underground and located a disfance away from pump room.
operating low pressure, are you referring to low npshr of rotary pump ? .
Assuming the npshr is low, however the suction lift is already 7 to 8 m with ample npsh margin...
With reference to this similar thread, therr was discussion that a pump, pressumed a self priming is able to lift up to 12 m height.
https://www.eng-tips.com/viewthread.cfm?qid=307610
Iam wonderin if how it be possible considering
a pump is having NPSHr, let say 0.3 to 1 meter depending on...
Hi,
Appreciate for such a great suggestion,
@FacEngrPE
It is temporary setup testing, in actual site, the frame would be filled with epoxy grouting on 4" C channel after alignment and actual pipe is hooked up.
I noted on suggestion of Tugboat that I should place the shim inner on the holding...
Tugboardeng,
Sorry I did not get your point that I shoupd put the ahim on side at # 5. The 5 is where the shim would support the whole wright of geaebox.
The bolt hole as i said is not symetrical.
I also not getting you 2nd mounting pad is designed in the wrong direction. Which one ?
Hi Thanks for the inputs, I attached the alignment photo of the equipment's for better discussion.
https://1drv.ms/u/s!AshU1On9Vy6fipV5fodEJqpQr6bXpA?e=YJh05m
Here what is the finding:
1. The Gearbox bolt is not symmetrical in design, shims can only be placed at the back of the gearbox...
