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4.
"FAN TYPE"
is displayed next on the top line. Select
"AIR COOLED"
for units with package-mounted air
coolers only. This will delay fan startup until the oil has warmed up in the package. Select
"WATER COOLED"
for water cooled units or any unit with a remote cooler. This will run the fan whenever the compressor motor
runs.
5. In the top line,
"SYSTEM VOLUME"
is displayed. The bottom line may be selected as
"SMALL"
,
"MEDIUM"
, or
"LARGE"
. This tunes the response of the modulation control loops to optimize loop stability. It is factory set to
MEDIUM. Set as follows:
SMALL
if estimated volume is less than .25 gallon per CFM.
MEDIUM
if estimated volume is between .25 and 1.0 gallon per CFM.
LARGE
if estimated volume is greater than 1.0 gallon per CFM.
NOTICE
The setting of this parameter is not critical. When set to the most appropriate value, the
controller will maintain the discharge pressure with minimized modulation changes.
6. In the top line,
"AUTO RESTART"
is displayed. The bottom line will indicate either
"OFF"
or
"ON"
. The factory
setting is
"OFF"
, and the controller will display a power failure shutdown after power has been restored.
Set this feature to ON when it is necessary to have the compressor automatically restart after a power
interruption. There will be a brief delay, then the control resumes the mode it was in prior to the interruption.
This feature shall only be enabled when the owner determines that it is safe to do so. It is recommended that
compressor access be limited to only trained service personnel when this feature is used.
7. This step is only encountered if the AUTO RESTART function was set to ON in the previous step. In the top line
,
"RESTART TIME"
is displayed. The bottom line will indicate a time between 5 and 60 seconds. It is factory set
at 10 seconds. This is the amount of delay introduced before restarting after power has been restored. Set it as
desired to allow time for power to stabilize before starting compressors.
8. The display now reads
"JOG MOTOR?"
and indicates the amount of time to energize the starter. Adjust with
the [+] or [-] key to the smallest value needed to bump the motor and check rotation. 0.1 to 0.2 seconds is
normally adequate for factory-furnished full-voltage starters; wye-delta or remote starters may require a little
more time. Set back to zero to proceed to the next step.
9. In the top line,
"AUX SD MESSAGE"
is displayed. The bottom line will display the message which will appear if
power is removed from terminal 7. Select the most appropriate message for user-furnished shutdown devices,
and press [ENTER] to proceed.
10. This completes the unit setup adjustments. The controller will return to the main adjustments menu.
OTHER CONTROL FEATURES
Modulating - Load / Unload -
The controller offers two control modes, to suit the needs of different applications with
different storage capacity.
When set for
"MODULATING"
, the controller will start and load whenever the pressure drops below the reset
pressure. Continuous modulation by the turn-valve (if so equipped) and the inlet valve will maintain the discharge
pressure near the set pressure for any CFM demand from full capacity to very light demand. The inlet and
TurnValves are coordinated to always use the most efficient and appropriate control. At very light or zero demand,
the compressor will completely unload, blowdown, and stop as appropriate for the selected operating mode. This is
the normal control mode for the compressor, and is preferred for almost all applications.
When set for
"LOAD-UNLOAD"
, the controller will start and load whenever the pressure drops below the reset
pressure. When the pressure rises to the set pressure, it completely unloads. If the blowdown timer has not timed
out, the compressor will reload when the system pressure drops below the midpoint between set and reset pressure.
If the blowdown timer has timed out, the reservoir will blow down, and reload will not occur until the pressure drops
below the reset pressure. Use a large receiver volume or wide difference between set and reset pressure to prevent
rapid cycling.
Summary of Contents for AUTO SENTRY-ES+
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