21
WARNING: Equipment Damage Hazard
Do not attempt to bypass this safety, as pump
damage will occur.
Failure to follow these instructions could result in
property damage and/or moderate personal injury.
Low Level Fault
This safety is used in Vertical Turbine pump
applications to signal when the wet well level
is too low to permit safe operation of the
pumps. Used in conjunction with a relay, three
(3) level probes are placed in the wet well.
From bottom to top, these are the "reference"
(ground) probe, the "low" probe, and the
"reset" probe. If the wet well level drops below
the "low" probe, the relay sends a signal to the
PLC telling it to shut down pump operation.
The fault cannot be cleared until the reset
probe is under water.
After a five (5) second time delay, all pumps
shut down. Once the low level 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 Level
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.
Phase Failure
This safety utilizes a phase monitor to analyze
incoming voltage and determines whether all
voltage parameters are acceptable and the
phase sequence is correct.
The LED on the phase monitor is lit if there is
no fault. If there is a problem, the LED is off.
After approximately one (1) second, all pumps
are shut down. Once the phase failure
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
"Phase Failure 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.
WARNING: Electrical Shock Hazard
As this is an electrical problem, adhere to all
safety procedures during troubleshooting. To clear
the fault, press the reset button.
Failure to follow these instructions could result in
property damage and/or moderate personal injury.
INDIVIDUAL PUMP FAULTS
There are three faults that are considered
Individual Pump Faults. These are overload
protection, high pump temperature (optional), and
individual pump phase fault (optional).
Overload Protection
Overload Protection is standard on all pump
stations. The overload is a safety device that
shuts the motor down when amperage
exceeds the setpoint of the device.
If the motor amperage exceeds the overload
setpoint that pump shuts. In some instances,
an individual pump can trip without shutting
down the entire system if another pump is
available to operate. If so, the PLC will
automatically bring the available pump on line.
The green light above the pump switch flashes
for the pump that was shut down. Go to
"Alarms," and the display should show that an
"Individual Pump fault" has occurred. The PLC
does not differentiate between the different
individual pump faults.
WARNING: Overload Hazard
The overloads are located inside the control
panel. All safety procedures must be adhered to
during the any adjustment or resetting process.
Failure to follow these instructions could result in
property damage and/or moderate personal injury.
