Is it possible to get the VMMs with different connector options?
No. VMM connector options are not offered because the connectors are integral
to the circuit board and mechanical enclosure design.
What is the maximum bus loading on the CAN network?
Requirements can vary by system; however, the industry standard is no more than
50% average bus loading.
Do I need to fuse VMM power?
Yes. Power connections to the VMM should be fused. Refer to Power on page 35
for more details.
Do I need to fuse VMM outputs?
VMM outputs are internally protected and no external fusing is required.
How much wetting current is provided by the VMM inputs?
Wetting currents can vary by module and by input type. Wetting current
specifications are found in the specifications tables for each input.
Do I need an external flyback diode on my inductive load?
No. The VMM has internal flyback diodes as part of its high-side driver circuitry,
and therefore an external flyback diode is not needed.
Is it a problem to have an external flyback diode on my inductive load? Will it affect
my current sense measurement?
No. Having an external flyback diode present on circuits with internal flyback
diodes will not cause problems and will not affect the current sense measurement.
Does the VMM offer analog outputs?
No; however, with the addition of external circuitry, an output can be PWM'd to
generate an analog voltage.
Can I vary the frequency of my PWM output?
The frequency of each output is determined through software. Consult the
appropriate software manual for details.
Can I connect VMM outputs in parallel?
You can connect on/off controlled outputs in parallel, but PWM’d outputs cannot
as they are not guaranteed to be synchronized.
My VMM is broken. Who do I call regarding warranty?
Broken VMMs should be returned to the service department of the OEM, and the
OEM will co-ordinate returns to the appropriate Parker Vansco service center.
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