Thread: Huanyang 2.2kw VFD - How to interface with the Open-collector outputs DRV and UPF

I haven't had anything to do with logic chips in ages, but way back when, an open collector output just needed a pull up resistor to the logic supply rail to make it work.

On a conventional output, there was a transistor (pull up) between the logic supply and output terminal, and another transistor (pull down) between output and logic ground. If both transistors are off, the output is high impedance (isolated), if pull up is on, output is high, if pull down is on output is low, and both being on is an invalid state as it provides a dead short between logic supply and logic ground (smoke released).

For open collector, they left out the pull up transistor. This has the advantage that you can combine a number of outputs in an OR configuration, with a single pull up resistor, saving the need for additional logic gates. Then any of the combined outputs can pull the entire chain low, it will only be high if all outputs are high. Very handy for data busses etc if my memory serves me, haven't played at chip level for 20+ years.

Not sure but the pull up resistor should probably be in the order of 1-5Kohm. Google would be your friend for the particular logic family you are dealing with. If you are dealing with odd bod voltages in the interface, you could use a resistor and the LED of an opto isolator as the pull up device, then use the corresponding transistor in the opto isolator to provide the input to the interfaced device. This will provide voltage isolation, and allow you to invert signals etc if need be.

Hope this helps

Thank you malb, that reinforces what I understood about open-collector outputs. My application is there are two OC outputs from my Huanyang VFD that can be tied to many of the VFD operational states. The OC specs from the manual are +24vdc/100ma. Next to the OC terminals is a +24vdc terminal. I want to drive two Solid State Relays that have an input of +5 to +24vdc. I'm just going to pull-up the two OC outputs with 10k resistors to the +24vdc terminal, and drive the SSR's from the OC+ and OC-.

Thanks for your input

Ozzie

Originally Posted by Ozzwinkle

Thank you malb, that reinforces what I understood about open-collector outputs. My application is there are two OC outputs from my Huanyang VFD that can be tied to many of the VFD operational states. The OC specs from the manual are +24vdc/100ma. Next to the OC terminals is a +24vdc terminal. I want to drive two Solid State Relays that have an input of +5 to +24vdc. I'm just going to pull-up the two OC outputs with 10k resistors to the +24vdc terminal, and drive the SSR's from the OC+ and OC-.

Thanks for your input

Ozzie

You don't really need a pull-up resistor in that application, simply connect the +ve of the SSR to the +24V supply and the -ve of the SSR to the open collector output.

Be sure to check what the manual says about maximum current capability of these open collector outputs.
A solid state switch probably won't exceed the maximum current but best to make sure.

As others have said, no pull up resistor required, just connect the +ve of the SSR to +24, and the negative to the OC output. The input side of the SSR consists of a limit resistor and the LED of an opto isolator, similar to what I explained for a voltage translator/isolator in my first post.

The 24V/100mA rating for the OC indicates that it can safely withstand 24V in the non conducting state, and can safely carry 100mA when conducting. Don't interpret that to mean that it can handle 2.4W (24V x 100mA), it carries zero current when non conducting, and has virtually no voltage drop when conducting. so the total power handling for the output stage will be in the tens of milliwatt range.

Thanks for all the information guys, have tried it both ways, no joy. Attachment shows what I have, what works, and what doesn't. Essentially, the physical relay output 3 works as it shoud. The optical isolated open collector outputs do not work. I am trying to get some information from the manufacturer, but I don't have much hope in that regard.

Originally Posted by Ozzwinkle

Thanks for all the information guys, have tried it both ways, no joy. Attachment shows what I have, what works, and what doesn't. Essentially, the physical relay output 3 works as it shoud. The optical isolated open collector outputs do not work. I am trying to get some information from the manufacturer, but I don't have much hope in that regard.

The CCT at the bottom of the page is correct.

The OC outputs switch to ground, so go from 24V to SSR+ and SSR- to DRV

Make up a test lead with just an led and resistor in series. Hook across the 24V and DRV. what do you get? If it doesn't light up when DRV is on, try hooking across 24V and DCM.. to make sure DCM is really ground return for the 24V supply.

Ray

I have concluded that the VFD is defective, or I do not know how to properly set it up to work correctly. This is a simple interface, and should be working as you have all described. The downside to using a Chinese product, is there is absolutely no Technical Support available. If this was anything but a hobby project, I would throw this VFD in the trash can, but it has become a personal challenge. Thanks for the help, but I'm giving up on these outputs.

Ozzie

Hi Ozzie,
I don't use the MFO's on my machine, but according to the manual I have lists PD050 to PD053 as the control parameters.
(This is not necessarily the right manual, but the factory defaults in my drive are the same as what's listed in the manual)

Maybe this will be a help -


PD050 Multi-Output 1（DRV function） Factory Setting：01**
﹡PD051 Multi-Output 2（UPF function） Factory Setting：05
﹡PD052 Multi-Output 3（FA, FB, FC function） Factory Setting：02
﹡PD053 Multi-Output 4（KA, KB function） Factory Setting：00
Set Range：00—32 Unit：1

00： Invalid: The terminal is set for no function to prevent false actions.
01： In Run: The contact will act when the inverter has output or receives the running command.
02： Fault Indication: The contact will act when the inverter detects abnormal conditions.
03： Zero Speed: The contact will act when the output frequency of the inverter is less than its starting frequency.
04： DC Braking indication: The contact will act when the inverter is in DC braking.
05： Set Frequency reach: The contact will act when the output frequency of the inverter reaches the set frequency.
06： Uniform Frequency 1 Reach: The contact will act when the output frequency of the inverter reaches the designated frequency (PD060).
07：。Uniform Frequency 2 reach: The contact will act when the output frequency of the inverter reaches the designated frequency (PD061).
08： In Accel: The contact will act when the inverter is in ramp-up.
09： In Decel: The contact will act when the inverter is in ramp-down.
10： Inverter Over-load Alarm: The contact will act when the inverter detects over-load.
11： Motor Overload Alarm: The contact will act when the inverter detects over-load of the motor.
12： In Over-torque Detect: The contact will act when the inverter detects over-torque.
13： Low Voltage Alarm: The contact will act when the inverter detects low voltage.
﹡14： Single Step End: The contact will act and generate one pulse when the inverter finishes a single step in implementation of program operation.
﹡15： Process End: The contact will act and generate one pulse when the inverter finishes all the steps (i.e. after one cycle) in implementation of program operation.
16：Set Counter Reach: The contact will act when the inverter implements the external counter and the counting value is equal to the set value (PD065).
17：Middle Counter Reach: The contact will act when the inverter implements the external counter and the counting value is greater than or equal to the set value (PD066).
18： External Control Timer 1 reach: The contact will act when the timer reaches the set value.
19：External Control Timer 2 reach:
20：4∽20mA disconnected: When AI input signal is opened the contact will act.
﹡25：Auxiliary Pump 1: This contact controls the starting and stopping of auxiliary pumps. For details refer to Operation of Multi-pumps.
﹡26：Auxiliary Pump 2
﹡27：Drawing reach: The contact will act when the drawing action is finished. The contact will automatically reset when the inverter stops.
﹡28： PID Lower Limit Alarm: This contact will act when the PID feedback is smaller than the lower limit (the set value of PD162).
﹡29：PID Upper Limit Alarm: This contact will act when the PID feedback is greater than the upper limit (the set value of PD161).
30：Fan act: When the temperature of the inverter is increased or it is in running, this contact will act.
31：Electromagnetic Relay Act: When the contact pulls in, the corresponding multi-function terminal will act.
32：Braking Resistor Act: When the inverter is in running and the DC voltage reaches the braking voltage the contact will act.
Note:
① The above functions with the mark of ﹡ are dedicated to the inverter of A series, which may be not available for P or J series.
② The functions of above 14, 15 and 27 are not available for P series, and the functions of above 25, 26, 28 and 29 are not available for J series.