Hi Tom,

I was hoping you could help me with using the Kanalog JP8 terminal for my application. My need is to supply low current 5V to a servo drive in order to use step and direction pulses for control purposes. I have it setup as open collector using the 5V which also powers KFlop and Kanalog. These pulses are being fed from the JP5 terminal of KFlop.

When the system powers up, the servo motor spins until I run the init file which defines the specs for the axis. I guess the default circuit in JP5 allows the 5V to flow in the pulse circuit (JP5 pin 5). My thinking was to use a relay to only allow the 5V after running init, solving the problem of the servo turning on startup.

How do the 5V pins work in the Kanalog JP8 terminal. Can I turn them on/off using a bit, or am I better off using one of the JP8 relays?

Thanks,
David.

Hi David,

I'm sorry I don't really understand what you are trying to do.

I don't understand why a Step/Dir drive would get step pulses before KFLOP is configured.  The Step/Dir signals should be floating like an open circuit.  They wouldn't be pulsing unless the wires are picking up noise?

The 5V pins on JP8 are just hard wired connected to the KFLOP/Kanalog 5V supply.  They can't be switched on and off.

The JP8 Relay drivers switch to GND.  They can't be used to switch +5V on and off unless you add an external Relay to do the switching of the +5V.

Regards
TK

 

Hi Tom,

I was hoping you could help me with using the Kanalog JP8 terminal for my application. My need is to supply low current 5V to a servo drive in order to use step and direction pulses for control purposes. I have it setup as open collector using the 5V which also powers KFlop and Kanalog. These pulses are being fed from the JP5 terminal of KFlop.

When the system powers up, the servo motor spins until I run the init file which defines the specs for the axis. I guess the default circuit in JP5 allows the 5V to flow in the pulse circuit (JP5 pin 5). My thinking was to use a relay to only allow the 5V after running init, solving the problem of the servo turning on startup.

How do the 5V pins work in the Kanalog JP8 terminal. Can I turn them on/off using a bit, or am I better off using one of the JP8 relays?

Thanks,
David.

Hi Tom,

Thanks for your reply.

For some reason the servo motor spins about 200 rpm when the system is powered up. If I start up with JP5 disconnected, there is no spinning. I would be surprised if there was noise, except perhaps within the drive itself. I don't have a warm fuzzy feeling about it. The drive software lets one choose between different input signal modes and the one I need allows the motor to spin. The other modes don't cause the spinning issue, so I guess I will try and make something else work... or add a relay if necessary.

When I first put a meter on one of the 5V JP8 pins I didn't see any power. I just checked again (after tightening the screw) and there it was.

Thanks again,
David.

 

Hi David,

I'm sorry I don't really understand what you are trying to do.

I don't understand why a Step/Dir drive would get step pulses before KFLOP is configured.  The Step/Dir signals should be floating like an open circuit.  They wouldn't be pulsing unless the wires are picking up noise?

The 5V pins on JP8 are just hard wired connected to the KFLOP/Kanalog 5V supply.  They can't be switched on and off.

The JP8 Relay drivers switch to GND.  They can't be used to switch +5V on and off unless you add an external Relay to do the switching of the +5V.

Regards
TK

On 12/28/2015 2:04 PM, david.m.stevenson@... [DynoMotion] wrote:

 

Hi Tom,

I was hoping you could help me with using the Kanalog JP8 terminal for my application. My need is to supply low current 5V to a servo drive in order to use step and direction pulses for control purposes. I have it setup as open collector using the 5V which also powers KFlop and Kanalog. These pulses are being fed from the JP5 terminal of KFlop.

When the system powers up, the servo motor spins until I run the init file which defines the specs for the axis. I guess the default circuit in JP5 allows the 5V to flow in the pulse circuit (JP5 pin 5). My thinking was to use a relay to only allow the 5V after running init, solving the problem of the servo turning on startup.

How do the 5V pins work in the Kanalog JP8 terminal. Can I turn them on/off using a bit, or am I better off using one of the JP8 relays?

Thanks,
David.

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