Inverter reset oak output 5 (Resolved)

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Robs-shiz
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Inverter reset oak output 5 (Resolved)

Post by Robs-shiz »

Over the past few days I have finally been able to get my VFD wired up and configured. Everything seems to be functioning as it should except for the inverter reset. I can only get continuity between the OAK output 5 and common if I force the output but cannot get it to work using the virtual control panel reset. Is there a parameter I need to change for it to work?
Robs-shiz
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Re: Inverter reset oak output 5

Post by Robs-shiz »

Attached is my report
Attachments
report_0617200971_2020-11-05_15-35-45.zip
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cncsnw
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Re: Inverter reset oak output 5

Post by cncsnw »

Normal PLC logic only tries to reset VFD faults (only turns on OUT5) if the VFD is reporting a fault. If your VFD is not in a fault condition, then E-stop will not try to reset it.

Also: your PLC program currently appears to send a reset to the VFD only in response to the physical Emergency Stop button; not in response to the VCP reset button.
Robs-shiz
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Re: Inverter reset oak output 5

Post by Robs-shiz »

Thank you
mrichards
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Re: Inverter reset oak output 5 (Resolved)

Post by mrichards »

With my OAK and automation Direct GS20 drive, I had my e-stop relay open the STO (safe torque off) input to the drive.
I was unable to reset a drive fault as there was a vicious cycle where the fault signal from the VFD was triggering the drive fault input of OAK. This prevented the OAK "all OK" output from energizing (which drops my e-stop relay) preventing the VFD from resetting.

I solved this by modifying my PLC as follows:
In timer definitions:

Code: Select all

SpindleFaultDelay_T             IS T25
In InitialStage, :

Code: Select all

SpindleFaultDelay_T = 1500,
In MainStage I commented out this original code:

Code: Select all

;IF Initialize_T && !SpindleInverterOk_I
;  THEN FaultMsg_W = SPINDLE_FAULT_MSG_C, SET SpindleFault_M
;IF !EStopOk_I && !SpindleInverterOk_I THEN (InverterResetOut_O)
And added this modified code:

Code: Select all

;Start the timer when E-stop is released, reset timer when pressed
IF EStopOk_I THEN SET SpindleFaultDelay_T
IF !EStopOk_I THEN RST SpindleFaultDelay_T

;If SpindleInverterOk_I is open and both the Initialize_T and SpindleFaultDelay_T
;timers have elapsed, set SpindleFault_M
IF EStopOk_I && !SpindleInverterOk_I && Initialize_T && SpindleFaultDelay_T
 THEN FaultMsg_W = SPINDLE_FAULT_MSG_C, SET SpindleFault_M

;If e-stop is reset and delay timer is still active send reset to VFD 
 IF EStopOk_I && !SpindleFaultDelay_T THEN (InverterResetOut_O)
Every time the e-stop is cycled, the PLC ignores the spindle fault for 1500ms, while asserting the spindle reset output. This gives the VFD a chance to reset and clear it's fault output
------------
Mark
cncsnw
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Joined: Wed Mar 24, 2010 5:48 pm

Re: Inverter reset oak output 5 (Resolved)

Post by cncsnw »

With my OAK and automation Direct GS20 drive, I had my e-stop relay open the STO (safe torque off) input to the drive.
Assuming this is a GS4 drive, you simplify the solution by setting P6.71 = 1.

With P6.71 = 1, STO is still reported as a fault condition, but it is not latched, and therefore does not require a Reset after you re-close the circuit.

You would still need your timer to ignore the inverter fault condition for a short time after you release E-stop; but you wouldn't need the revised InverterResetOut_O logic.
mrichards
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Re: Inverter reset oak output 5 (Resolved)

Post by mrichards »

cncsnw wrote: Wed Nov 25, 2020 8:09 pm
With my OAK and automation Direct GS20 drive, I had my e-stop relay open the STO (safe torque off) input to the drive.
Assuming this is a GS4 drive, you simplify the solution by setting P6.71 = 1.

With P6.71 = 1, STO is still reported as a fault condition, but it is not latched, and therefore does not require a Reset after you re-close the circuit.

You would still need your timer to ignore the inverter fault condition for a short time after you release E-stop; but you wouldn't need the revised InverterResetOut_O logic.
Hi,
It's a GS20 Drive. It looks like the similar parameter is P06.44 = 1.
From the manual....
P06.44 STO Latch Selection ♦R/W 062C 41581
Range/Units (Format: 16-bit binary) Default
0: STO Latch
1: STO No Latch

Use P06.44 to select STO latch.
• P0644 = 0: STO Alarm Latch After you clear the cause of the STO Alarm, use a Reset command to
clear the STO Alarm
• P0644 = 1: STO Alarm no Latch After you clear the cause of the STO Alarm, the STO Alarm clears
automatically


Thanks, I had never noticed that parameter before on the G-series drives.
------------
Mark
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