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Intelligent MDU
Can units be stacked in a rack without vertical spacers?
Yes, provided that forced air cooling within the rack is allowed to reach all units. Note that
when units are stacked, the internal temperature of the stacked units can reach 60°C when
the current rating is reduced to 9.7A.
Why is a rack tray recommended?
The unit itself weighs approximately 3 kilograms plus the weight of cable attached to the tie-
bar at the rear of the unit.
Do both supplies in a dual input Cardinal iMDU need to be the same phase?
No, the input selector method employed allows non-phase inputs to be switched safely.
What safeguards are there to prevent unwanted alert chatter when configuration limits are
momentarily breached?
A tag and re-test system is used so that after an event is created following the breach of a
set parameter, an alert is only created after the re-test delay. This means that the breach
must be persistent for an alert message to be created.
If necessary, re-configure MDU settings with slightly higher maximum parameters to
prevent excessive alerts.
How can alerts be sent to inform a user of a power out?
The Cardinal PSU is designed to maintain internal power rails for 10 seconds after input
power loss. This provides time for alerts to be sent following total loss of input mains power.
This also explains why LEDs remain lit for a while after switching off the unit.
2014 dB Broadcast Ltd
Cardinal
Trouble Shooting
23
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