The MC41/42/43 looks like a great series of products, but I am reluctant to go with a 3 or 4 master system. When can we expect a series of expansion modules along the lines of the MC41/42/43? or am I stuck with the XA2 indefinately for current outputs?
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?:
We are designing our last machines with XC42 instead the phase-out XC10 and we are experiencing some issues.
One of them is related with the activation of some Inverter (Euradrives) and Soft Starters (ABB) digital inputs.
When the DOUT HS is directly connected to those high impedance inputs and the output is OFF, surely due to the leakage current, the Inverter and the Soft Starter interpret it as ON state, so they run untimely!
It is possible to reproduce this just wiring a DOUT HS to a DIN PD, the input will be ON all the time, even when the DOUT is OFF:
Also, when the inpedance is very high (not with XC42 DIN PD in this case), the DOUT HS is ON, the Open load error appears due to low consumption of the high impedance inputs, and this checking cannot be disabled in the IQAN...
We thought to add and extra resistor in parallel to the high impedance input to avoid this error, but we don't like this "solution", it can be really dangerous because if the resistor is broken or loosen, the devices will be running untimely!!
Our only solution was to add 24Vdc relays in the HS outputs and wire the contact of the relay to the high impedance inputs.
We think that the best solution would be the possibility of disabbling this leakage current for Open load ckeching in the DOUT HS. Is there any possibility of implanting it in future releases?
Thanks for your help and best regards,
We are going to be mounting an XC43 externally. The module and connector are rated for it, IP6K9K.
Has anyone else done this?
How does one go about neatly mounting external diodes for the digital outputs?
I need diodes that go between HS DOUTs to ground and between the pins of HS+LS DOUTS.
I am using a DOUT LS on XC23 to drive a 12V incandescent bulb on an instrument panel. In steady state, the lamp draws 85 mA. I am getting an overload on this output when I try to activate the lamp. I was able to temporarely solve the problem by using a 22 ohms in series with the load. So I believe the problem is the inrush current of the lamp. The instruction book of the XC23 clearly states that the LS DOUT "are designed to drive small loads, e.g. lamps and buzzers". The example even shows a lamp being driven by a LS DOUT.
Can you explain if I'm doing something wrong. If not, is there any fix available to solve this issue ?
This is a two part question regarding the criticality of VREFs for IQAN Modules. We use an MD4 and XA2 in our system. On the XA2, we use VREF to support a three axis joystick and one pressure transducer (4 VINs).
We received a report from the field that a short circuit between VREF and ground caused the XA2 module to fail completely resulting in "I/O No Contact" IQAN Error Message on the MD4.
Is this a typical or expected failure mode for an XA2 with a damaged 5V reference voltage regulator? Or is it more likely there was a mis-diagnosis from the field? I can't think of a way to validate this without destroying an otherwise healthy XA2.
Would this also be the case in an MC42?
I'm having an issue where the PWM outputs jump in voltage to battery voltage seemingly randomly and with no change in the displayed output on IQAN run. Anyone know what is going on?
We had a XC42 where we use a hall effect analog device that was mapped to pin 8 and configured as an analog input. The device was connected to Vref A so uses a supply voltage of +5v and provides 0.5-4.5v thru 180 deg of rotation. We first started to see it only indicating from 2.5-4.5v and then eventually we got fixed values that fluctuated based on if the hall effect magnet was present or not. After some trouble shooting we removed the wire from pin at a connector and were getting a fixed voltage of around 4v at pin 8. With this removed the magnet rotated gave us 0.5-4.5v at the output of the sensor.
A data sheet of the sensor is attached. Model # is RTP180LVNAA
We ended up remapping the input to pin 52 and it all worked fine again.
It almost seems like the pull up resistor in the channel was "turned on"???Honeywell RTP Sensor
I've noticed that the following XC43 pins appear inaccessible via IQANdesign:
Is this by design or am I missing something? They're listed as PWMOUTs or High Side DOUTs in the manual.
I have not checked the other XC4x modules.
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