Gardner Denver INTEGRA EFB99A, Руководство по эксплуатации и обслуживанию

Страница: 28 / 53

13-8-619 Page 21
The first adjustment, the load pressure, controls the pressure at which the compressor will start, see
Figure 4-2). This is often referred to as the cut-in or reset pressure, and will be the minimum pressure
while in automatic operation. For the most economical operation, set this as low as tolerable for the
equipment operating from the compressed air.
The second adjustment, the unload pressure, controls the difference between the cut-in and cut-out
pressure, see Figure 4-2). Wide differentials run the compressor for fewer, longer cycles, but will raise
the maximum pressure in the plant. Narrow differentials reduce maximum pressure, but load and unload
the compressor more frequently. This should be set so that the cut-out pressure does not exceed that
maximum allowable pressure of equipment connected to the compressed air system. Do not set above
the rated pressure of the compressor package.
NOTICE
The unload setpoint cannot be set above the pressure listed in Figure 4-2.
Once the adjustments are completed, disconnect and lock out power, replace the switch cover, and
remove the test gauge.
NAMEPLATE FULL LOAD
OPERATING PRESSURE
CONTROL SYSTEM PRESSURE (PSI)
LOAD UNLOAD
100 85 100
125 110 125
150 135 150
175 160 175
Figure 4-2 – MAXIMUM SETPOINT FOR NEMA 4 PRESSURE SWITCH
WARNING
Electrical shock can cause injury or death. Open main disconnect and any
other circuits, lockout and tagout before working inside the control box.
The electronic controller has three selections which affect its behavior. Disconnect and lock out power to
the compressor, and open the control enclosure. Locate the three pairs of pins on the circuit board. To
change the operation, add or remove a jumper onto the pair of pins as indicated below. This can be done
with small jumper connectors commonly used on PC boards, and sold in electronics and computer stores.
Restore power and start the compressor.
Auto Time - This jumper is located on the pair of pins closest to the edge of the control board. It controls
the time that the motor will run unloaded before stopping. This is normally jumpered, and sets the
automatic time for 10 minutes. With the jumper removed, this time is set to 5 minutes.
Automatic Restart - The jumper located in the center controls automatic restart after power interruptions.
This is normally not jumpered, and the control will not start compressor operation when power is
resumed. Manually reset the compressor by switching to the OFF position, then place it in the ON
position to start operation.