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[How do I?] Lenze Vfd And Control Box

AxeMaker

Active Member
Active Member
#1
Hello,

I am wondering if I can get some help wiring my VFD to the control box?
The .pdf manual for my particular VFD is attached and I have notated and highlighted my model's info in red.

The cable that I am using between the motor and the VFD is 18/7 outdoor flexible cable.

VFD Label.png

VFD Internals.png

Control Box Front and Rear.png

Thank you !
 

fixit

Active User
H-M Supporter-Premium
#3
18 ga wire is too small for the motor. You do not want to run motor & control wires in a cable like that. Motor voltage is 240 & control is 10 volts not good in a bundle or same conduit.

fixit
 

JimDawson

Global Moderator
Staff member
Director
#5
18 ga wire is too small for the motor. You do not want to run motor & control wires in a cable like that. Motor voltage is 240 & control is 10 volts not good in a bundle or same conduit.

fixit
Good catch @fixit :encourage:

I missed that one:(

At least 14 ga to the motor from the VFD

Supply the VFD with 12 ga
 

JimDawson

Global Moderator
Staff member
Director
#11
Next to the lid screws are there are screw holes that will take #10 screws I think. When I removed my speed control hardware, I had that big flat surface to mount to. Your mileage may vary;) An angle bracket mounted in a convenient location would work well. I like my switch on the left side of the head, near the location of the original switch, but center of the head works OK.

upload_2016-10-14_16-45-45.png

upload_2016-10-14_16-46-4.png
 

AxeMaker

Active Member
Active Member
#12
Believe it or not I just discovered there isn't a plug on the mill. :face slap:

So I took some pics of the existing electrical wiring in the hopes that I can find out if there is anything out of the ordinary and some help converting it for the VFD. The first pic is the mill switch cover and the second is where I labeled the wires. The previous owner disconnected the mill at the switch box.


Switch Cover.png
Motor Wiring Closeup3.png
 

JimDawson

Global Moderator
Staff member
Director
#13
It looks like the the motor is wired for high voltage (460), you need to reconnect for 230V

Connect the VFD directly to the motor.
T1 (U) - 1, 7
T2 (V) - 2, 8
T3 (W) - 3, 9
4, 5, 6 connected together.
Ground to motor frame, there may be a green grounding screw in the connection box.
 

JimDawson

Global Moderator
Staff member
Director
#19
That's not good. :eek: Time to check your motor and wiring. Something is going to ground.

Connect the VFD directly to the motor.
T1 (U) - 1, 7
T2 (V) - 2, 8
T3 (W) - 3, 9
4, 5, 6 connected together.
Ground to motor frame, there may be a green grounding screw in the connection box.
Did you ground the 4,5,6 connection by chance? It should not be grounded. My wiring statement above may be a bit ambiguous. The ground wire should go to the motor frame.
 

AxeMaker

Active Member
Active Member
#20
I found the problem... I had the 4,5,6 connected to ground. I fixed that and I am getting the correct display reading. I was also able to power up for a just a second from the VFD panel. The remote control box was not working so I am assuming there is some programming I need to do.

Oh when it was running it was running in reverse.

edit:... The motor was making a slight scraping sound. You can hear it as the motor begins to spin up.
 
Last edited:

JimDawson

Global Moderator
Staff member
Director
#23
I would get the motor running from the keypad first. Once all of the parameters are set correctly, then make the program changes to operate from your new panel.

To change the motor rotation, you may be able to just exchange the T1 and T2 connection. This works with most VFDs, but not all.