![background image](http://html1.mh-extra.com/html/bailey/infi-90-imhss02/infi-90-imhss02_instruction_3482467042.webp)
OPERATING PROCEDURES
MANUAL OPERATION
I-E96-315B
5 - 3
contacts. The raise contact opens the valve while the lower
contact closes the valve.
NOTE: The HSS enters the emergency manual mode when it loses
communications with the MFP. When the MFP re-establishes com-
munication with the HSS, a bumpless transfer of operation occurs
and causes the HSS to exit the emergency manual mode. The MFP
resumes automatic operation from the valve position held during
manual operation.
Emergency Trip
Emergency trip provides failsafe operation of equipment and
safety to personnel by providing a way to drive the throttle
valve closed in an emergency. The trip bias circuit overrides
position control from the HSS microcontroller and drives the
valve closed. To drive the valve closed, close the trip bias switch
(or pushbutton) to apply +24 VDC to the trip bias digital input.