20
down. Once the high pressure condition
clears, the station automatically resets, and
automatic operation resumes. The PLC allows
three (3) automatic restarts in a one-hour
period. At the fourth occurrence in a one-hour
period, the station shuts down (hard fault).
The red station fault light on the control panel
door comes on, and the display indicates an
"Alarm Shutdown Alert." Go to "Alarms," and
the display should show that a "High
Discharge Pressure fault" has occurred.
NOTE:
At this point, shut the station down,
and determine what the problem is. Consult
the Troubleshooting section of this manual for
assistance.
To clear the fault, press the Reset button.
Low Inlet Pressure
This optional safety is usually used on
flooded-suction booster pump applications.
Normally, a pressure switch monitors the inlet
pressure on the "suction" side of the pump.
This switch is located in a box on the lower left
side of the control cabinet. The switch is used
in conjunction with a relay to inform the PLC
that it is unsafe to run. Setting the low inlet
pressure
condition
is
accomplished
by
physically adjusting the pressure switch.
There is a 20 second time delay in the PLC.
Once the inlet pressure drops below the
switch pressure setting, all pumps shut down
after a 20 second delay. Once the low inlet
pressure
condition
clears,
the
station
automatically resets and automatic operation
resumes. The PLC allows three (3) automatic
restarts in a one-hour period. At the fourth
occurrence in a one-hour period, the station
shuts down (hard fault). The red station fault
light on the control panel door comes on, and
the display indicates an "Alarm Shutdown
Alert." Go to "Alarms," and the display should
show that a "Low Inlet Pressure fault" has
occurred.
WARNING: Low Inlet Pressure – Station
Shutdown Hazard
At this point, shut the station down, and determine
what the problem is. Consult the Troubleshooting
section of this manual for assistance.
Failure to follow these instructions could result in
serious personal injury, death, or property
damage.
There are two dials on the pressure switch.
The one on the top is the correct adjustment.
Turn clockwise to increase the pressure
setpoint, counter-clockwise to decrease.
CAUTION: Delta Pressure Setting Hazard
Do not adjust the bottom dial. This is a delta
pressure setting, and is not used. This dial must
be adjusted fully counter-clockwise (0 position). If
you are having trouble with your pressure switch,
always verify that this dial is in the 0 (fully counter-
clockwise position) before adjusting the top dial.
Failure to follow these instructions indicates a
potentially hazardous situation, which, if not
avoided, may result in property damage.
WARNING: Minimum Pressure Setting
Hazard
The pressure setting is based on the minimum
pressure that the pump can safely operate. Do not
lower the pressure switch setting without
consulting the factory
.
Failure to follow these instructions could result in
serious personal injury, death, or property
damage.
Loss of Prime
This optional safety is usually used on end-
suction centrifugal pump applications.
A level probe is placed in the suction piping at
a predetermined level. This probe works in
conjunction with a relay to inform the PLC that
it is unsafe to run. Fault usually signifies a
malfunctioning foot valve.
After a second or two, all pumps shut down. If
the loss of prime condition clears, the station
automatically resets, and automatic operation
resumes. The PLC allows three (3) automatic
restarts in a one-hour period. At the fourth
occurrence in a one-hour period, the station
shuts down (hard fault). The red station fault
light on the control panel door comes on, and
the display indicates an "Alarm Shutdown
Alert." Go to "Alarms" and the display should
show that a "Loss of Prime fault" has
occurred.
NOTE:
At this point, shut the station down,
and determine what the problem is. Consult
the Troubleshooting section of this manual for
assistance.
To clear the fault, press the Reset button.
