I'd like to have IQAN control be paralleled with switch control. This specific application will be a drop axle. I want the IQAN to drop the axle in certain situations, and have a switch that will drop it at any time, even if the control system is powered down,

I believe I have to protect the module from back-feeding, correct? Will just diode protection be enough or do I need to have the Dout controlling a relay that would toggle the input between the switch and a +bat source?

Would any problems arise from supplying Parker Pulsar valves with a digital out signal instead of a PWM signal if proportionality is not desired? We're using an XA2.

Would a clamping diode be necessary in this configuration?

Why must a PWM output be wired as shown below in the XA2 manual?

When I've worked with mobile style PLC's in the past: It's just 1 pin for an output that delivers a PWM signal to a solenoid, then the other pole of the solenoid is wired to a common ground.

Why must there be three pins involved for this? Why shouldn't you wire one pole of the solenoids to a common ground (same potential as battery negative)?

Thanks in advance.

I have encountered a problem with DOUT on XA2 modules. We operate several Parker D1VW (NG6) valve, with multiple XA2 modules. Some DOUT (from different XA2) does not activate the magnet coil, although it looks completely correct when I'm connected to IQAN Design . DOUT = Tru.

We use valve contacts with zener diodes, it works on most DOUT otherwise. I had to change the output to PWM instead and then it works without a problem. Is there any problem with the XA2 modules, or are the Zener diodes that do not work against XA2?

Due to a voltage drop in the system, because of an electric fan switching on, all the voltage inputs give a low error.

The strange thing is that the voltage drop is not so big. it drops from 27 to 22 for only a sec due to the high start current of the fan.

Is this normal, I thought the modules could be used in 12 VDC system also. So the voltage drop should not be a problem.

regards,

Ed

I have D-in G, pin #38 hooked up to the brake lights of a truck to detect when the brakes are on.

I recieved a report on one truck that the brake lights don't work when the IQAN system is powered off.

Does the impedance change radically when the system is powered down?

the book states 62 kohm pull-down in parallel with 470 pF. I can't imagine that would draw enough power to keep the brake lights from illuminating.

Is this a faulty module? or is this normal and I need to add a large in-line resistor on all trucks in the field wired this way? Are XS2 modules the same way if this is normal?

eta: when I use a multi-meter on another XA2, I get 62K ohms between pin #15 and pin #38, so I am leaning twoards this being a bad module.

As you can see the Vref and +Bat are a bit off on MOD4.

any ideas?

Was wondering what  the temperature threshold is on XA2 units before the internal temp will trigger a warning in the system?