Section 5
COMPRESSOR OPERATION
21
MANUAL OPERATION MODE
In this mode the compressor will run indefinitely, as
long as temperatures and pressure remain within
the valid operating ranges, and the motor overload
or emergency stop contacts are not tripped. Press-
ing the “
I
” will turn on the compressor and put it in
manual mode. If the compressor is already running,
but in automatic mode, pressing “
I
” will switch op-
eration to manual. Pressing “
I
” while already running
in manual mode will cause the Supervisor to turn off
the common fault relay, if engaged, and clear any
maintenance indicators.
To stop the compressor, press “
O
” If the compres-
sor is already off when “
O
” is pressed, the common
fault relay will be turned off, if engaged, and it will try
to clear the alarm and maintenance indicators. Re-
gardless of what the compressor is doing, pressing
“
O
” puts the Supervisor in manual stop mode.
AUTOMATIC OPERATION MODE
In this mode the compressor will start if line pressure
(P2) is less than the
LOAD
parameter. It will stop if
the compressor runs unloaded for the number of
minutes indicated by the
UNLD TIM
parameter. To
put the compressor in automatic mode press “
”. If
P2 is already less than
LOAD
the compressor will
start immediately, otherwise the system status will
indicate
STANDBY
and the LED marked
AUTO
will
flash.
If the compressor is already running, but in continu-
ous mode, pressing “
” will switch operation to au-
tomatic. Pressing “
” while already running in auto-
matic mode will cause the Supervisor to turn off the
common fault relay, if engaged, and clear any main-
tenance indicators.
In automatic mode the compressor can be stopped
manually by pressing “
O
” Stopping the compressor
using “
O
” will put the Supervisor in manual stop
mode.
Regardless of whether in “automatic” or “manual”
mode, control of the load solenoid will be based on
the parameters
UNLD
and
LOAD.
This operation is
as follows:
P2 > UNLD ----> load solenoid turned off
P2 < LOAD ----> load solenoid turned on
POWER FAILURE RESTART
If the restart timer (RST TIME parameter) is dis-
abled the compressor will not try to start after a pow-
er up. If this time is set to a value the machine will go
into standby after power up. When the line pressure
drops below the load setpoint, the restart timer will
start timing. When the timer expires the machine will
start.
SEQUENCING MODES
The following is a brief description of sequencing
modes. For details see the Supervisor II Sequenc-
ing & P r ot oc ol M anual ( S ee Rec om m ended S par e
Part s List )
.
S
DISABLED
-- Responds to status and pa-
rameter change messages via the RS485
network but will not respond to start, stop,
load or unload messages.
S
REMOTE
-- Responds to status and pa-
rameter change messages but will not re-
spond to start, stop, load or unload mes-
sages. The remote inputs and are enabled
(start/stop, load/unload, master/local).
S
SLAVE
-- Will respond to all messages, but
will not start or load unless commanded to
do so by a message. This mode is used to
control the machine from a master comput-
er.
S
HOURS
-- Sends status message about
once a second; starts, loads and unloads
machines based on sequencing hours.
S
COM ID #
-- Sends status message about
once a second; starts, loads and unloads
machines based on machine Com ID#.
5.9 PURPOSE O F CONT RO LS -- SUPERVISOR II
CONTROL OR INDICATOR PURPOSE
EMERGENCY STOP SWITCH Pushing in this switch, found adjacent to the Supervi-
sor , cuts all AC outputs from the latter and de--ener-
gizes the starter. A fault message (E STOP) is dis-
played by the Supervisor until the button is pulled out
and the “
O
” pad is depressed.
DISCHARGE TEMPERATURE PROBE--T1 Shuts the compressor down when the compressor dis-
charge temperature exceeds 240
_
F(116
_
C). Continu-
ally monitors air/fluid mixture discharged from the
compressor unit.
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