DE-18 USER MANUAL SECTION 5
56
MASTER/SLAVE COMMUNICATIONS
AND CONTROLS
SEQUENCING SET-UP PROCEDURE
(It is important to follow steps in specific order)
1. Determine the desired pressure setting (135/
150 mode) and which unit will be the Master
and determine the number of slave units.
Note: The Master should always be at one
end of the line of units and the slaves should
be numbered sequentially starting with #1
from the Master. (Example: ~master, Slave
1, Slave 2, etc.)
2. Starting with the master, change the ~setup
lockout (S-7) to "YES".
3. Set slave # (S-8) on the master 10 number of
slaves that will be controlled (example: 5
units local so there will be 4 slaves (SLV4)
and one master.)
4. Set master communications enable (5-9) to
"YES"
5. Verify that the pressure mode is correctly set
(P-64) (135/150).
6. Set the desired discharge pressure using the
"increase/decrease" buttons on the front
door.
7. Leave unit powered, but "DO NOT" disable
the setup lockout feature (S-7).
8. SLAVE UNIT SETUP
9. Go to slave #1 and change the "setup lock-
out (S-7) to ~Yes.
10. Set slave # (S-8) to SLVl (SLVl is the first
slave, SLV2 is the second slave, etc.)
11. Verify that the master communications
enable (S-9) is set to ~NO"
12. Verify that the pressure mode is set the
same as the master (P-64) (135/150).
13. Tune the desired discharge pressure using
the "increase/decrease" buttons on the front
door to read the same as the master.
14. Leave unit powered, but "DO NOT" disable
the setup lockout feature (S-7).
15. CAUTION: When the unit is set as a slave
and the discharge pressure is below the P2
override pressure (5-15 adjustable setpoint),
the unit will start if the setup lockout is dis-
abled.
16. REPEAT STEPS 8 through 14 for all slaves
in the series.
17. Return to the master and connect a commu-
nications cable between each unit. Caution:
Do not connect a complete loop, a cable
should go from the master to slave 1,2, 3,
etc., but there should not be a cable from the
last slave back to the master.
18. Once all the cables are installed, push in the
Emergency Stop on "ALL" units. Finally,
beginning at the last slave, power the units
by turning the Emergency Stop. CAUTION:
Once the Emergency Stop is pulled out and
the unit powers up, the controller will have a
short delay showing the program number
and pressure mode. When the screen
changes to Standby the unit may start imme-
diately.
19. Continue powering all remaining units, pow-
ering the master unit last.
20. Check each unit's P2 pressure reading and
tune the setpoint pressure accordingly if P2
is less than the P2 override setpoint (S-15
adjustable setpoint). (Note: The way in which
the piping and hoses are connected, and
whether a unit is running or not will affect the
P2 pressure reading from unit to unit. Ideally
with a unit running, the setpoints should be
adjusted so that the units are tuned to main-
tain the same pressure.)
WARNING
Never work on this equipment unless the
Emergency Stop button is pushed in. These
units are subject to automatic starts that
may be life threatening.
CAUTION
Read this entire section before attempting
to setup any units for sequencing. The
operator must have a thorough understand-
ing of these units, especially this section,
prior to setting up any units to sequence.
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