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I have ERIC Drive EI-7001 Series AC inverter (VFD) displays the fault of GF ?

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dineshdeshmuk

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I have ERIC Drive EI-7001 Series AC inverter (VFD) displays the fault of GF (Grounding Fault) after 2 to 3 seconds as i try to increase the speed of the motor ?

The manual tells to check motor winding, motor connections & connection between motor & inverter, i have checked all of them infact i have changed the cable & connectors but the fault persists.

what might be the problem then ? Cause manual doesn't tell any other remedy other than these two, so what to do ?

How to resolve the problem ?

thanks
 

The manual clarifies, that GF is only triggered by a massive fault current of 50% inverter rated current. This suggests
- defective motor
- wrong motor connection, e.g. star point wired erratically to P.E.
- defective inverter
 
Like FvM wrote
The manual clarifies, that GF is only triggered by a massive fault current of 50% inverter rated current. This suggests
- defective motor
- wrong motor connection, e.g. star point wired erratically to P.E.
- defective inverter
Click to expand...
1.
the motor wiring is exact as shown in picture
just a straight cable from VFD to motor
Ground wire is connected only to the motor frame
network, earth is supplied to the VFD

2.
Take the wires out from VFD
and test motor side U,V,W against GND
with insulation tester ( 500V...750V)
Do not connect tester to VDF side.

3. Consult dealer.

EI-7001-GF_Fail_01.jpg
 
kak111 said:
Like FvM wrote

1.
the motor wiring is exact as shown in picture
just a straight cable from VFD to motor
Ground wire is connected only to the motor frame
network, earth is supplied to the VFD

2.
Take the wires out from VFD
and test motor side U,V,W against GND
with insulation tester ( 500V...750V)
Do not connect tester to VDF side.

3. Consult dealer.

View attachment 62302
Click to expand...

Test motor side against ground when the VFD is generating the output or when it completely off ???

What does it mean by insulation tester ? And, where to connect insulation tester if not to VFD ???

thanks
 

Have you checked that ground wire is connected only to the motor frame
not in motor star-point.
------------------------------------------------------------------------------------------------------------------

Insulation tester
ie megaohm measuring device with measuring voltage supply 500Vdc
for ex.
Yokogawa - Products - 2404 Series Insulation Testers
Testing Voltage (DC)/MΩ Range 500 V/100 MΩ

Normal universal ohm-meter use 1.5V...6V when measuring circuit resistance, if motor has breakdown in higher
voltages you can not find it with 6V.

Because thiskind of measuring device supply measuring voltage of 500Vdc
dont connect it to VFD .

Take motor wires out from VFD and measure only motor side of system.

EI-7001-GF_FailMeas_01.jpg
 
Last edited:
kak111 said:
Have you checked that ground wire is connected only to the motor frame
not in motor star-point.
------------------------------------------------------------------------------------------------------------------

Insulation tester
ie megaohm measuring device with measuring voltage supply 500Vdc
for ex.
Yokogawa - Products - 2404 Series Insulation Testers
Testing Voltage (DC)/MΩ Range 500 V/100 MΩ

Normal universal ohm-meter use 1.5V...6V when measuring circuit resistance, if motor has breakdown in higher
voltages you can not find it with 6V.

Because thiskind of measuring device supply measuring voltage of 500Vdc
dont connect it to VFD .

Take motor wires out from VFD and measure only motor side of system.

View attachment 62333
Click to expand...


ya sure its connected properly to the motor fame only not in star or neither in delta point .....

i have checked the output voltages at U, V & W without the load (without the motor) varying from 0 volts to 410 V AC ......... when switching from 0 Hz Frequency to 57 Hz frequency .........
 

And there is no breakdown in cable or motor , when voltage is about 500V

then
Is motor - VFD cable long ( over 100ft)

Application Report
Long Drive/Motor Leads

Read page 3.
Related Issues
Generated EMI/RFI. The amount of electrical

**broken link removed**

Can you give VDF model code , motor data and cabel data...........
 

kak111 said:
And there is no breakdown in cable or motor , when voltage is about 500V

then
Is motor - VFD cable long ( over 100ft)

Application Report
Long Drive/Motor Leads

Read page 3.
Related Issues
Generated EMI/RFI. The amount of electrical

**broken link removed**

Can you give VDF model code , motor data and cabel data...........
Click to expand...

VDF Model Code is : EI-7001-005H , AC 440 V, 8A, Rated 5 HP (3.7 KW)
the input 3-phase supply cable & the output supply cables are both of same size 3 core cable of 2.5 mm*2 .

Motor is 3 Phase AC induction motor

thanks a lot sir
 

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