SDM-CVO4 4-Channel Current/Voltage Output Module
2
Enclosures designed to house electrical equipment usually meet the standard
requirements. The ENC12/14, ENC14/16, and ENC16/18 enclosures meet these
requirements if fitted with a padlock and with the correct labels on the door.
Ensure that metal parts on the outside of the enclosure that might come in
contact with active high voltage circuits are connected to a safety ground. The
ground lug on Campbell Scientific enclosures is not an issue because it
normally is the point of contact to a good ground point.
Ensure that the cables and their connectors are rated to a high enough voltage
and assembled in a safe fashion. Provide adequate strain relief at the point of
exit from the enclosure.
If using an external device that has a high voltage, include a breaker system
that disconnects the device from the voltage source if the system insulation
breaks down.
With a system made to these requirements, the maximum recommended
continuous operating voltage between the data logger and input is 240 VAC.
This value is derived from the voltage rating of the terminal blocks used and an
internal suppression capacitor.
The unit is designed to withstand a transient flash test of 1500 V RMS AC, for
two seconds. However, the following design aspects can influence the test
results.
•
To help suppress emissions of electromagnetic interference, the
isolation barrier is bridged by a 1nF, class ‘Y’ safety capacitor. This is
rated to withstand a 2700 V, 2 second flash test, but will fail if
exposed to voltages in excess of 240 V RMS for long periods.
•
A spark gap protects the capacitor and opto-isolation component that
bridges the barrier from transients and static. The spark gap has a
2500 VDC nominal breakdown voltage. If this device is at the low
end of its tolerance band (±10%), combined with the normal tolerance
of flash test devices, the spark gap could fire during a 1500 VAC flash
test, which may cause an indication of failure. Testing at a slightly
lower voltage will confirm whether there is a true fault or not.
For questions about the safety of your installation, first seek advice from your
local safety advisor and then Campbell Scientific if you require further
technical details.
To ensure safe and correct operation, the SDM-CVO4
must
be installed where there is no risk of water ingress or
condensation.
3. Initial Inspection
Upon receipt of the SDM-CVO4, inspect the packaging and contents for
damage. File any damage claims with the shipping company. Immediately
check package contents against the shipping documentation. Contact Campbell
Scientific about any discrepancies.
CAUTION
