Class1 107490 - UNI-Governor 107396 107269 software v 6 00 - Manual (Page 4)

3 C:\manuals\Uni-Gov-V6-107490
Preset Mode
Pressing the PRESET switch in either mode will control the engine to attain the preset RPM or pump
pressure programmed in governor memory. If there is more than 10 PSI pressure on the pump, the
RPM Preset is disabled and the Message Center will display DISABLED.
High Idle Mode
An input is available to bring the engine speed to a PRESET RPM (High Idle) from a remotely mounted
switch. While operating in this mode, the display will show HIGHIDLE. This function is inoperative
when the pump engaged input is active, there is more than 10 PSI on the pressure transducer or if the
MODE switch on the governor has been pressed. Pressing the IDLE switch causes the high idle to
drop out and the high idle input must be toggled off and then on again to reinstate high idle. The INC and
DEC switches are active in high idle mode and the engine speed can be adjusted, changing engine
speed in this manner will not change the preset RPM that is set in memory.
Idle Mode Pressing the IDLE switch at any time returns the engine to idle speed.
NOTE
: A
FIRM
,
POSITIVE SWITCH DEPRESSION IS NECESSARY TO ACTIVATE THIS FEATURE AND A QUICK PRESS MIGHT BE IGNORED
.
SENSOR
Whenever the transducer signal is below 0.3 VDC or above 4.8 VDC, a sensor fault will
be logged and SENSOR will be displayed in the message center. ( SENSOR will flash
if the failure occurs while operating in PSI Mode) Once a failure is detected, the gover
nor can no longer maintain a pressure setting. It will hold the current engine RPM and
only operate as a throttle.
Once the SENSOR message is displayed, it will not clear until power to the governor is reset.
It is extremely important that the cause for this message is investigated.
The governor cannot control discharge pressure properly unless the sensor signal is reliable and cor-
rect.
Switch Session Pressure Increase
If the INC switch is held the governor will not allow a change greater than 80 PSI without releasing the
INC switch and pressing it again. This is only applicable when the discharge pressure is above 90 PSI.
This function prevents high pressures from being introduced by a distracted operator.
Pressure / Water Loss
If the discharge pressure drops below 30 PSI for any reason, engine speed will not be increased. The
governor output voltage will reduce to the last known value (engine RPM) where the pressure setpoint
was obtained. The display will flash -INTAKE- during this low pressure condition. If the pressure in-
creases above 30 PSI, OPERATOR will flash and the governor will not increase output unless the
operator presses the INC or PRESET switches. If pressure above 30 PSI is not regained within 5
seconds, the governor will return the engine to idle and display LoSupply. The operator must make
certain that the water supply is adequate and then reinstate governing using the MODE, INC and/or
PRESET switches.
Pressure Recovery / Cavitation (TRIM)
The governor has a trim adjustment, this can be set between 5% and 20% of maximum throttle. This
parameter limits the governor’s maximum increase in a pressure recovery attempt. The message
center will flash OPERATOR when this limit is reached and the RPM will not increase further. The
operator must take positive action to restore discharge pressure. If pressure is not restored within 4
seconds, the governor will reduce output to the last known output where pressure was maintained. The
operator must input a new setpoint with the INC/DEC or PRESET switches. If the pressure rises above
the original setpoint and the governor controls a decrease in engine speed, the governor will return to
normal operation and PSI MODE is displayed.
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Overview
CAUTION