I'm thinking about controlling a motorized hydraulic pressure relief valve (the motor turns the pressure setting in and out) with two COUTs on an XA2 module. The motor was previously controlled with a couple of digital outputs and relays as an H-bridge. This is more of a XA2 hardware question; are the diodes necessary to protect the high side COUT as shown?:
Obviously only running either COUT A or COUT B at a time.
Or are diodes not needed?:
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.
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.
I have measured the voltage and current being drawn with the output off and its 1.3mA @ 5.8v. Is there any reason why we couldn't simply connect asuitable resistor in parallel with the siren to stop this sound being generated?
First of all, I'm very happy to see this online community, We have been needing an IQAN development/troubleshooting/idea-sharing place for a while, and I'm happy to be a part of it,
My question is:
What exactly does a "VREF Error" message mean when it is not associated with an input channel? We have a MD3 connected to 2 XA2 modules. Intermittently, a system message will display that reads: "XA2.0 VREF Error 2.2V"
The system runs on 24VDC.
What conditions could possibly cause the VREF on an XA2 module to dip so low? Again, the VREF error is not indicated as being associated with any particular input -- just an XA2 module. If the system/battery voltage drops low, does the reference voltage regulator have trouble maintaining 5 volts? Wouldn't the system just shut off before that happens?
Has anyone experienced this before?
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