Instruction Manual

Glossary
September 2013
Glossary-7
Watch Dog Timer
A timer that the microprocessor must rearm
periodically. If the microprocessor is unable to
rearm the timer, the instrument goes through
reset.
Zero Power Condition
The position of the valve when the power to the
positioner is turned off. It is used to reference 0%
travel. For Relay A and C, Port A will be at
atmosphere pressure, and if double-acting, Port B
will be at supply pressure. For Relay B, Port B
will be at supply pressure.
Glossary