Bell & Gossett S12596B Technologic 350 Pump Controller - Manual (Page 14)

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5.2.8 Destaging occurs when:
1. HP or AMPs (selected method of staging) of the
last pump staged, plus the cumulative value of all
other running pumps, reaches the destage percent
value entered in the user menu, and a proof timer
and the minimum run timer time out.
2. GPM decreased to the value of the destage GPM
in the menu. The pump stops after a proof timer
and then a minimum run timer.
3. PSI setting of the destage PSI value in the menu is
reached. The destage PSI is higher than stage PSI
and a proof timer and the minimum run timer time
out.
4. Temperature setting of the destage temperature in
the menu is reached.
All of these methods of destaging are exclusive and
may not be mixed.
5.2.9 Pump Shut Down occurs when:
5.2.9.1 High 1PT Pressure analog signal triggers when “High
1PT Pressure” of the menu is reached and the “High
1PT proof timer” of the menu expires. All pumps stop.
Alarm message is set. Pumps start when “High 1PT
Reset” is reached.
5.2.9.2 Low 1PT analog signal reaches the level of “Low 1PT
Pressure” in the menu and “Low 1PT proof timer” in
menu times out. All pumps stop. Alarm message is
set. Audio visual alarm is set. Pumps restart when
“Low 1PT Reset” setting in the menu is reached.
Auto reset.
5.2.9.3 High 2PT Pressure analog signal triggers when “High
2PT Pressure: of the menu is reached and “High 2PT
proof timer” of menu setting expires. All pumps stop.
Alarm message is set. A-V alarm turns on. Manual
reset to start pumps.
5.2.9.4 Low 2PT Pressure analog reaches menu setting “Low
2PT Pressure” and after “Low 2PT proof timer” menu
setting times out the alarm message is set. Does not
stop pumps. Auto reset.
5.2.9.5 High T-2 analog reaches “High T-2 Cut Out” value of
the menu. The “High T-2 proof timer” times out.
Alarm message set. Pump/s stop. Auto reset occurs
when “High T-2 Reset” of the menu is reached.
NOTE: A value must be entered for temperature display.
5.2.9.6 O.L.X Failure from digital inputs from starters 1M, 2M
and 3M from pumps 1, 2 and 3, respectively trip and
shut down the associated pump. The next pump in
the sequence will start. “Alarm” message flashes.
Manual reset. Upon manually resetting the tripped
starter and pushing the reset key the previously
tripped starter starts its pump and the pumps run
together for 5 seconds and then return to normal
operation.
5.2.9.7 Pump X Failure from digital inputs from DP switches 1
through 3, respectively trip and shut down the associ-
ated pump 1, 2, or 3 respectively. The next pump in
sequence then starts. Pump fail message set. Manual
reset. Shut off pump now restarts with 2 seconds
delay.
5.2.9.8 (B) Alarms – are listed in Table 4.5.2. Most alarms are
discussed with the balance self-explanatory.
5.2.9.9 Normal Stop – with power on press start/stop key.
Enabled pumps have flashing green LEDs. All faults
are in memory and do not reset. Status of the 3 pump
keys is written to memory.
5.2.9.10 Stop – with power failure, alarms are reset but status
of start/stop key and 3 pump keys is held in memory.
5.3
MANUAL OPERATION (Watchdog LED Off)
5.3.1 Choose local or remote operation.
5.3.2 AUTO/HAND Key – select HAND.
5.3.3 Enable Pumps by pressing 1, 2 or 3 PUMP keys.
5.3.4 Start/Stop as 5.2.4 above.
5.3.5 Pump Start as 5.2.5 above.
5.3.6 Alternation – none.
5.3.7 Staging – none.
5.3.8 De-staging – none.
5.3.9 Pump Shut Down – none. However, all alarms of
Table 4 are active but do not shut the pumps down.
Some items are not in normal scroll. See foot note 3
of Table 3. Note that motors are still protected with
O.L. relays as part of the respective starter.
5.4
MANUAL OPERATION
(CPU Fails, Watchdog LED on)
The Technologic 350 has a redundant feature allowing
critical operation even though the microprocessor and
its support I.C.’s may have failed. Although this is a
rare occurrence, B&G has planned for this possibility.
When the Watchdog LED is “on” a separate section of
LOGIC is used to bypass the problem area. This
LOGIC has its own memory which is held with power
off by a small clock battery (B1). This memory must
be pre-set for operation as desired upon CPU failure.
To set this memory perform the following (assuming
unit is running in auto):
1. Press STOP Key – Red stop LED is on.
2. Press AUTO/HAND Key – Red HAND LED is on.
3. Press PUMP ENABLE keys in any order for pumps
to run upon a CPU failure. Associated green LED’s
will flash.
4. Press AUTO/HAND key – green AUTO LED is on.
5. ENABLE PUMPS as required and press
START/STOP key – green LED on.
The unit is now running in auto. If the CPU fails the
system reverts to the manual operation that was pre-
set in steps above. Pumps do not stop except for
overload trip. Press the PUMP ENABLE key to stop a
specific pump or press START/STOP key to stop all
pumps.
Press PUMP ENABLE key to re-start a pump. Only the
hand and pump LED’s are active. All other LED’s and
the display are off.