Sullair LS-25S-257KW, Operator'S Manual And Parts List, Page: 31 / 83

Section 5
OPERATION
26
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 pres-
sure (P2) is less than the LOAD parameter. It will
stop if the compressor runs unloaded for the num-
ber of minutes indicated by the UNLD TIM parame-
ter . To put the compressor in automatic mode
press “ ”. If P2 is already less than LOAD the com-
pressor will start immediately, otherwise the sys-
tem 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
automatic. Pressing “ ” while already running in
automatic mode will cause the Supervisor to turn
off the common fault relay, if engaged, and clear
any maintenance 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
power 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 & Protocol Manual (P/N 02250057---696) .
S
DISABLED --- Responds to status and
parameter 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 outputs are
enabled (start/stop, load/unload, master/
local).
S
SLAVE --- Will respond to all messages,
but will not start or load unless comman-
ded to do so by a message. This mode is
used to control the machine from a master
computer.
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 un-
loads machines based on machine Com
ID#.
5.5 SUPERVISOR OUTPUT RELAYS
RELAY OPERATION
RUN RELAY (K1) Contact closure energizes the compressor starter.
*---DELTA (K2) A timed contact used to provide wye---delta transition
time.
UNLOAD/LOAD (K3) Controls ON LOAD/OFF LOAD operator of the load
control solenoid valve.
COMMON FAULT (K4) May be used to provide remote indication of any pre---
alarm, maintenance or fault shutdown condition.
DRAIN VALVE (K5) Controls a solenoid valve to provide automatic con-
densate removal.
FULL LOAD/MODULATE (K6) Used with sequencing feature.
NOTE: All output relays will handle 8 amperes at 120/240 VAC.