PWI320 Manual

10
Maintenance
Dry Contact Relay (option)
The Power Supply requires no maintenance other than the occasional wipe down to remove
dust that could reduce its ability to dissipate heat, and carefully blow air through the cooling
vent to remove any dust buildup on it or inside the unit.
The Power Supply can be tted with a 1 amp dry contact relay that can be used to indicate
Power Supply status to a monitoring system. It has both a normally open and normally closed
contact which changes state depending on the presence or absence of charging voltage on
the output of the Power Supply and is independent of the microprocessor. If the Power Supply
is producing voltage on the output, the normally closed contact will be closed and there will
be an electrical connection between NC and COM. If the voltage on the output of the Power
Supply goes to zero, the contact will change state. The Normally Open contact operates
exactly in the reverse of the Normally Closed contact.