High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
(OP)
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 KW parameter
From manufacturing the following is the
Estimate Power at rated 300 RPM 20 Hz is 3.6 GPM 50 bar is 2 Hp.
However running in my setup of new motor 15 KW connecting in Delta 415 V.
10 Hz, 25 Bar is already close to locked rotor current of 36 Amp wbich shown thr motor slowed down and stopped.
I pressumed the VFD setting ia not configured to Constant torque load where V/ Hz ratio is low.at 10 Hz voltage is aeound 40+ Volt. This reduced the torque which increased the current.
[QUOTE]
the V/Hz ratio is too low, then the motor torque availability may not meet what is required and
the motor may experience a pull out condition. When pullout occurs, the motor will operate at high slip and potentially operate in the breakdown torque region, where the VFD will see high current and then
[end]
This video of the test
https://1drv.ms/f/s!AshU1On9Vy6fiv1QZx3Nu2MOmMpe8Q
Hope anyone with great knowledge of VFD can enlighten me in the setting and caused of overload.
fault on overload
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 KW parameter
From manufacturing the following is the
Estimate Power at rated 300 RPM 20 Hz is 3.6 GPM 50 bar is 2 Hp.
However running in my setup of new motor 15 KW connecting in Delta 415 V.
10 Hz, 25 Bar is already close to locked rotor current of 36 Amp wbich shown thr motor slowed down and stopped.
I pressumed the VFD setting ia not configured to Constant torque load where V/ Hz ratio is low.at 10 Hz voltage is aeound 40+ Volt. This reduced the torque which increased the current.
[QUOTE]
the V/Hz ratio is too low, then the motor torque availability may not meet what is required and
the motor may experience a pull out condition. When pullout occurs, the motor will operate at high slip and potentially operate in the breakdown torque region, where the VFD will see high current and then
[end]
This video of the test
https://1drv.ms/f/s!AshU1On9Vy6fiv1QZx3Nu2MOmMpe8Q
Hope anyone with great knowledge of VFD can enlighten me in the setting and caused of overload.
fault on overload
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
There's more data there.
The base cause for me is that you are trying to use a PD pump for the wrong application. If you want to limit pressure with variable flow, use a centrifugal pump and throttle it. running a motor design to run at 50 htz at 10 htz is going to cause you all sorts of pain, not least that the motor cooling fan works much less and hence motor will overheat or trip on high amps.
But I would be interested to hear what the issue is from the motor / VFD end as well.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
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 different VFD, The current is slightly larger by 0.2 ampere from rated motor which trip the system.
I believe at aite the VFD is set configured based on constant torque where my VFD is not at workshop.
So from all perspective, i try to isolate each problem at the time. I found no issue on pump after overhauled it.
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
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 be connected in delta.
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
Noted, but you're using a pump at 20% of its rated flow, but 100% of its rated pressure.
Pumps and motors don't like this.
You really need to avoid using motors and pumps at this low a percent of their rated duty.
Can you post a diagram of what the pump and valve you have is set up?
What may work instead is to operate the pump at higher speed, but control pressure and flow using a proper control valve on the the return / relief line back to the tank.
I assume your downstream equipment essentially controls flow based on pressure?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
CENTRIFUGAL:
(Pressure 2 = (Pressure 1) * ((Speed 2)/(Speed 1))^2
(Power 2) = (Power 1) * ((Speed 2)/(Speed 1))^3
(Flow 2) = (Flow 1) * (Speed 2)/(Speed 1)
POS DISPLACEMENT:
(Pressure 2) = (Pressure 1) * ((Speed 2)/(Speed 1))^(Factor) ... where 1.5 < Factor < 2.5
(Power 2) = (Power 1) * (Speed 2)/(Speed 1)
(Flow 2) = (Flow 1) * (Speed 2)/(Speed 1)
Under constant torque rating, the motor would be capable of delivering
(Power 2) = (Power 1) * (Speed 2)/(Speed 1).
This means that the nominal 15 kW rating would only have 3 kW (20%) of rated power available at 20% speed.
Under constant volt/hz (i.e., variable torque) the motor would be capable of delivering
(Power 2) = (Power 1) * ((Speed 2)/(Speed 1))^2
This means that the nominal 15 kW rating would only have 0.6 kW (4%) of rated power available at 20% speed.
Note that under constant torque application, the motor requires separate powered forced ventilation to operate below about 75% speed for extended periods (longer than a few seconds every 10 minutes or so). For variable torque application, the separate power requirement is not usually necessary.
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RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
You need to understand that after doing the above, the power the motor is capable of producing varies linearly with the percentage of speed you try to run it at.
I really can't understand what you are doing exactly, but this is likely a problem.
I don't really agree with this,
If you want to say that's a safe number that will always work, sure. But, it's not the limit the motor is capable of.
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
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 for last 4 years without any issue until recently has been run with undersized power.
The odd things why before pump maintanance of spares changed the exiating 11 KW motor has no issue running at 11 Hz at 50 Bar ?
I would need to investigate in my workshop with this 15 KW run at 5 different load test conditions. It proves that the VFD could provide torque boost except for 11 KW motor full load has exceeded its FLA.
However,The torque sensor shows much greater torque value vs motor rated torque despite the amperes is within 15 KW full load current.
Maybe you all can enlighten me why despite such high torque demand, the motor can still drive it .
I observed that using Quad which is variable torque has much lower current at maximum load of the pump of 50 Bar at 11 Hz using 15 KW workshop test.
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
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
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
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 ? .
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
RE: High Amp of Inverter Duty Motor 15 KW with inverter ATV 610D for CONSTANT TORQUE Plunger Pump
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 srill within its rated.