I have a project where we want to drive some hydrostatic pumps with current outputs on an MC4x controller, but the pump manufacturer's recommended control characteristics aren't available with the MC4x. This project had been working using an MD3 and several XT2 expansion modules, but these are both obsolete. 

The pump manufacturer recommends 35 Hz, but the MC4x only has 71 Hz and higher available. (the pump manufacturer also recommends the dither amplitude be set 125 mA, and that is no longer controllable at all)

So my question is:

1. Is there a way to make this work with 71 Hz? Is setting the frequency to just over double recommended going to work?

My CAN bus operates with approximately 2 V on CAN_L and 3 V on CAN_H during normal communication. I would like to ensure that the TVS diode remains inactive during normal operation and provides protection only during overvoltage or surge conditions.If this device is not suitable, please suggest an alternative TVS diode that is recommended for CAN bus protection and compatible with these operating voltage levels.Awaiting your feedback.

We have several machines with the MD3 + XA2 + XS2 architecture; the MD3 is no longer available to purchase, and we need to provide our customers with a compatible solution when their MD3s break down.

I have checked that in IqanDesign 7 I can create the following configuration: MD5-5 + XA2 + XS2. If we create an updated software, adapting the electrical connection, will this architecture be compatible with the systems currently in operation without changing the slave modules?

We have an MD5-10 display that transitions from the current display page to a black screen and then returns to the display page again. Seems to be about 2-3 seconds showing the display page and then about 0.5 seconds black. The issue does not appear to be program related because it has the problem even when you are in menu mode. We have noticed that turning the brightness down < 80% seems to make the issue go away.

Part number: 20085203

Serial number: 2444230031

Is there any known problem here?

Hello,

I am working on a hydraulic control system based on MD5 and MC43. The main control logic runs in MC43, while MD5 handles non-safety UI functions.

To ensure safe operation, I implemented a simple heartbeat between MD5 and MC43:

Setup:

• Heartbeat: digital signal toggling TRUE/FALSE every ~100 ms in MD5
• Transmitted via J1939 to MC43
• MC43 monitors time since last change
• System cycle time: 50 ms
• Safety action: if no change for >500 ms, MC43 disables outputs
• Logging is active on both MD5 and MC43

Problem:

The heartbeat signal is periodically lost or appears frozen for short periods (typically 100–3000 ms, sometimes longer), triggering safety shutdowns.

Test setup (minimal system):

• Only MD5 and MC43 connected
• 30 cm CAN cable
• Two 120Ω termination resistors at both ends
• No other CAN nodes
• Minimal application: only one J1939 message + heartbeat logic
• No HMI logic or additional communication

The issue still occurs in this simplified configuration.

Tests performed:

• Different CAN speeds (including 250k / 500k/1000)
• J1939 and generic CAN communication modes
• Same behavior observed across configurations
• No communication errors reported in internal Parker logs

Question:

Has anyone observed similar intermittent J1939 communication drops between MD5 and MC43 under otherwise stable conditions?

Hi, I have a MD4 display and it does not recognize the ID tag anymore. Already did a update to the last firmware but without results. Any suggestions?

Are there details yet for a North American phase-out plan for MD4?

This thread lays out MD4 phase-out for Europe, Middle East, and Africa: https://forum.iqan.se/communities/5/topics/4483-md4-phase-out-notice

I'm having an issue on a MD4 where I have turned the terminate CAN off on all 4 busses but they still turn on the internal resistors. I end up with 40 ohms as I have 2 physical termination resistors already. If I power cycle the MD4 the resistance will be 40 ohms for a min or two and then it drops to 60 as it should be. then I power cycle the Md4 and resistance goes to 40 again and then drops after a min or two. Its seems like the MD4 will not take the changes but it has been set this way for several months and it has been reprogrammed dozens of times

I received a notice from my supplier regarding the MD4-7 phase-out, and they’re asking me to estimate demand through 2029, which makes sense and is good to get ahead of.

The notice itself lays out the following milestones:

• April 15, 2026: Parker requests estimated demand forecasts. Priority given to customers who provide information.
• October 15, 2026: Customer final orders must be placed prior to this date.
• October 31, 2029: Last date for shipments from Parker.

However, my supplier is insisting that I must place a firm purchase order by April 15, 2026 to cover my forecasted needs, not just provide estimates.

This feels earlier and more binding than what the notice seems to require.

Is anyone else being told they need to place firm POs this far in advance, or does this sound like my supplier might be trying to lock in business ahead of the actual deadline?