[mactec54]

You may also need to program an input to accept the reverse direction signal. (Depends on the VFD model).
In some VFDs you can select that input screw terminal in the VFD with programming a parameter.
Also verify (measure) the voltage on the VFD for/rev terminal to make sure that your controller produces that signal.
Program M3 measure voltage and then M4 and measure voltage. It should be high and low or vica versa.

If the VFD goes into overcurrent then try to increase the spin-up (acceleration) time, that should be also a parameter in the VFD.

The voltage 0-10v has nothing to do with how the VFD Drive turns on in his case he will be using a Relay to turn the spindle On / Off FWD / REV

[OlfCNC]

The voltage 0-10v has nothing to do with how the VFD Drive turns on in his case he will be using a Relay to turn the spindle On / Off FWD / REV

I have never said that the 0-10V has anything to do with the drive turns. So I have no idea what you talking about. :stickpoke

[mactec54]

I have never said that the 0-10V has anything to do with the drive turns. So I have no idea what you talking about. :stickpoke

Then what are you talking about in your post (wedge)


Did you not Post this ( Program M3 measure voltage and then M4 and measure voltage.)

[OlfCNC]

Did you not Post this ( Program M3 measure voltage and then M4 and measure voltage.)

Measure voltage on the dir signal directly on the VFDinput terminal to make sure it gets the signal. To make sure that the signal is not missing, because if it does then whatever you will do it will not change direction.

[dub_cnc]

OlfCNC I had measured the output voltage at the BOB to the VFD's input signals. Everything was good there. I took Mach3 and the BOB out of the equation and went back into manual control from the VFD before I posted here. When I run the VFD in forward mode everything is fine. When I stop the spindle and press the REV button and then press RUN the spindle struggles to turn and then I get the error message.

[Eldon_Joh]

OlfCNC I had measured the output voltage at the BOB to the VFD's input signals. Everything was good there. I took Mach3 and the BOB out of the equation and went back into manual control from the VFD before I posted here. When I run the VFD in forward mode everything is fine. When I stop the spindle and press the REV button and then press RUN the spindle struggles to turn and then I get the error message.

try disconnecting the motor and connect 3, 120v lightbulbs connected in wye and see if you get medium brightness at start up and full brightness at 400hz (220volts will push 140volts across each bulb which is ok for short time)

if you get substantially brighter bulbs when starting up in reverse then the vfd is defective and/or has some hidden parameter by which it could change the volts/hz or the boost volts for each direction independently.. which i've never seen a vfd that can do that.


a resistor and a capacitor (maybe 1K ohm, and .1uf) can be used as an rc filter to measure the voltage with a 1Mohm digital volt meter.

[mactec54]

try disconnecting the motor and connect 3, 120v lightbulbs connected in wye and see if you get medium brightness at start up and full brightness at 400hz (220volts will push 140volts across each bulb which is ok for short time)

if you get substantially brighter bulbs when starting up in reverse then the vfd is defective and/or has some hidden parameter by which it could change the volts/hz or the boost volts for each direction independently.. which i've never seen a vfd that can do that.

Another one of your ridiculous postings (nuts)

a resistor and a capacitor (maybe 1K ohm, and .1uf) can be used as an rc filter to measure the voltage with a 1Mohm digital volt meter.

This is posable but you have to get it right You need a low Pass Filter to protect the meter and for it to measure the voltage correctly here is a article about low pass filters and Rc filters

https://www.electronics-tutorials.ws.../filter_2.html

[mactec54]

Measure voltage on the dir signal directly on the VFDinput terminal to make sure it gets the signal. To make sure that the signal is not missing, because if it does then whatever you will do it will not change direction.

Not correct on this VFD Drive when you switch a Relay on there is no voltage at the output of the relay to switch the VFD Drive On/ Off or to change the Direction there is no voltage in the switching if there is he has a problem

I think you are confused with the PWM signal with is what changes the speed of the spindle this has nothing to do with how the spindle motor will start M3 M4 and M5

So if he has a Voltage at the VFD Drive Terminals for FWD / REV then he has a problem if so this will damage the VFD Drive that he has

[OlfCNC]

Not correct on this VFD Drive when you switch a Relay on there is no voltage at the output of the relay to switch the VFD Drive On/ Off or to change the Direction there is no voltage in the switching if there is he has a problem

I think you are confused with the PWM signal with is what changes the speed of the spindle this has nothing to do with how the spindle motor will start M3 M4 and M5

So if he has a Voltage at the VFD Drive Terminals for FWD / REV then he has a problem if so this will damage the VFD Drive that he has

Usually the inputs are active low and pulled up to the internal 10V, 12V or 24V inside the VFD, so he can measure voltage between the Digital Ground and the input when the relay is open (off) or when it is not even connected.
When he switches the relay then he should measure 0Volts as he should switch the 0Volts to it.

[mactec54]

Usually the inputs are active low and pulled up to the internal 10V, 12V or 24V inside the VFD, so he can measure voltage between the Digital Ground and the input when the relay is open (off) or when it is not even connected.
When he switches the relay then he should measure 0Volts as he should switch the 0Volts to it.

You are completely confused,