Class1 107490 - UNI-Governor 107396 107269 software v 6 00 - Manual (Page 9)

8
NOTE
: While the governor is determining cavitation, the dis-
charge pressure drop will be treated normally. That is, the en-
gine will be commanded to increase speed to compensate for
the pressure reduction within the Trim Limit. This could result
in the engine running at a speed that can cause a pressure
“spike”.
P S I
- I N T A K E -
O P E R A T O R
- I N T A K E -
L O S U P P L Y
[ M O D E ]
If the pump discharge pressure drops below 30 PSI for more
than 5 seconds, the governor will return the engine to idle.
LOSUPPLY will be displayed in the message center. The gov-
ernor enters it’s initial power up state and a mode must be se-
lected to enable governing again.
Operation
When operating in pressure mode, once the pump pressure
exceeds 70 PSI, the governor will monitor the pump discharge
pressure and respond to changes in pressure by modulating
engine/pump speed.
If the discharge pressure drops and the governor is unable to
regain pressure within 4 seconds, the Message Center will
flash -INTAKE- to indicate an insufficient water supply the gov-
ernor will then reduce speed to the point that the pressure was
last achieved. At this time the Message Center will display OP-
ERATOR and will no longer attempt to automatically regulate a
decrease in pressure until the pump operator presses the
DEC,INC or PRESET switches. The governor will respond to
an increase in pressure if it occurs.