FRC InControl TGA300, Руководство пользователя

Страница: 15 / 52

TGA300 Rev180405
15
Pressure Mode Operation
In the pressure mode of operation the PRESSURE LED is on. The governor
maintains a constant discharge pressure within system capabilities. It adjusts the engine
RPM automatically to compensate for variations in pressure.
There is a maximum engine RPM programmed in the governor for pressure mode.
If the engine reaches the programmed maximum RPM the message display flashes MAX
RPM / OPERATOR and the engine RPM is not allowed to go higher. (The maximum
engine RPM is normally set at 2100 and is programmable.)
If the discharge pressure is below 15 PSI when the operator increases the pressure
setting, the display shows PRESS LOW .
Note:
When changing from RPM to pressure mode during operations, hold
the PRESSURE button for 3 seconds. The pressure setting is the pressure
that the pump was operating at in RPM mode.
1. Press PRESSURE button to select the pressure mode.
Result: PRESSURE LED goes on.
2. Press PRESET and/or INC/DEC or rotate the control knob to select pressure
setting.
Result: Message display shows pressure setting, engine RPM changes.
3. Press
IDLE button after operations to bring engine to idle RPM.
Result: Message display shows IDLE ENGINE , engine at idle RPM.
Opening/Closing Discharge Valves
In pressure mode the governor maintains the pressure setting regardless of the
number of discharge lines that are opened or closed providing there is sufficient water
supplied. As lines are opened the discharge pressure starts to drop, and the governor
raises the engine RPM to maintain the required pressure. As lines are closed and the
discharge pressure starts to rise, the governor lowers the engine RPM to maintain the
required pressure.
Operating From a Pressurized Supply
When operating from a pressurized water source (hydrant, in-relay, etc.), the intake
supply should be routed through a valve. If the pressurized source fails, the pump
operator can close the valve. This eliminates the chance of sharp pressure spikes at
the pump intake if the supply is resumed suddenly. The operator must open this valve
slowly when the supply is resumed to help prevent pressure spikes.
Note:
The following description Running Away From Water, Low Water,
or No Supply Water is for software with a revision number V500.03 and
newer. Prior revisions should be updated. (Refer to Programming Section
to view the software revision number.)