salmson ALTI-VS Manuel D'installation Et Mise En Service page 15

ENGLISH
3 pumps
The 3-pump boosters with electronic control use the same automa-
tic control pressure switch as an electromechanical version (see
paragraph 6.5.1 for the adjustments).
Dry-running pressure switch (version "V") (see Fig. 5)
Principle:
On dry-running pressure drop, closing of pressure switch and stop-
ping of pumps. After return of water and timer (see timer paragra-
ph), restarting of the pumps. The pressure switch is preset in the
plant (0.5 bar). To change this value, proceed as follows:
Remove the cover
Turn the difference screw (item 1) fully clockwise but
do not tighten it.
Turn this screw (item 1) a quarter turn
anticlockwise.
Remove the locking pin (item 2) from the disc (item 3).
Turn the pressure disc (item 3) fully
anticlockwise.
Close the suction valve. Open the discharge valve until the desired
dry-running pressure is reached (read on pressure gauge).
Turn the disc (item 3) clockwise until a click can be heard. The dry-
running indicator on the box goes off
(flashes if electronic box and three-pump version).
Reinsert the locking pin (item 2).
Put the cover back on.
Float switch (version "B")
Adjust the float so that there is always at least approximately 40 cm
of water above the inlet ports to overcome the resistance of the
check valve-strainer.
Timers
Principle:
The timers optimize the operation of the booster. They are preset in
the plant. To change their values, proceed as follows:
Electromechanical control (see Fig. 2b), diagram inside box.
1 RME timer - relay associated with the dry-running pressure switch.
This timer inserts a safety delay before the restarting of the pumps.
Set the timer to 180 seconds.
2 Timer RCD 1, plus RCD 2 in 3-pump version - relay associated with
the pressure switch controlling the pumps at the low and high pres-
sures.
Adjustment according to installation
Example:
RCD1 at 3" and RCD2 at 6".
(" = second)
3 Timer RT - starting order switching relay.
This timer changes the starting order of the pumps under the control
of the clock.
1-2/2-1 for 2 pump modules.
1-2-3/2-3-1/3-1-2 for 3 pump modules.
Set in the plant to 1 second (do not change).
4 Timer RM - hold relay.
This timer extends the operating time of the last pump on the order
of relay RCD1.
Adjust the timer to 180 seconds. This adjustment limits the number of
times the pumps are started.
5 Timer RCA - hold relay for 2nd pump of a 3-pumps module.
Adjustment according to installation.
Example: RM minus 10"
Values of timers:
RME = 10 to 180"
RCD 1 = 0.1 to 40"
RCD 2 = 0.1 to 40"
RT = 0.1 to 40"
RM = 10 to 180"
RCA = 10 to 180"
Electronic control of 2 pumps (see Fig. 2c)
1 Dry-running timer
Marked "Level" on back of cover of box.
This timer introduces a safety delay before the pumps are restarted.
Set the timer to 3 minutes. During this time, the dry-running indicator
is off.
2 Pump control timers.
Marked "pump 1" and "pump 2" on back of cover of box.
These timers stop the pumps at the high pressure.
Their settings are staggered so that the pumps do not stop at the
same time.
Example:
Pump 2 - timer set to 20 seconds.
Pump 1 - timer set to 30 seconds.
Electronic control of 3 pumps
1 Dry-running timer
Marked "Level", on back of cover of box.
This timer introduces a safety delay before the pumps are restarted.
Set the timer to 3 minutes. During this time, the dry-running indicator
flashes.
2 Start II and Start III - starting timers of pumps 2 and 3.
Adjustment according to installation.
Example:
Start II = 10"
Start III = 20"
3 Stop I, Stop II, Stop III timers - stopping of pumps 1, 2, and 3.
Adjustment according to installation.
Example:
Stop I = up to 180" (in all cases more than 10").
Stop II = 30"
Stop III = 0"
Setting Stop I to 3' reduces the number of times the pumps are star-
ted.
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