11
STATION OPERATION
This section covers the sequence of operation for
your station including: Door Switch Operation,
Automatic Operation, and System Safeties.
DOOR SWITCH OPERATION
System Control Switch
Allows operator to select how the station
operates:
OFF
Regardless of individual switch
position, pumps do not operate.
AUTO
Places the system in
automatic mode.
MANUAL
Places the pumps in manual
mode. The operator must start and stop
the individual pumps using each pump’
s
switch.
Individual Pump Switches
Allows operator to select which pumps
operate:
NOTE:
Pumps have an OFF/ON switch or
a MANUAL/OFF/AUTO switch.
MANUAL
These switches start the
individual pumps. However, the system
MANUAL/OFF/AUTO switch must be
placed in the MANUAL position before the
individual pump is turned ON. Otherwise,
each switch must be cycled OFF, then ON
to “arm” the pump for operation.
OFF
Selected pump does not operate,
regardless of any other switch position.
AUTO
Selected
pump
operates
in
Automatic Mode provided there is not an
individual pump overload trip.
ON
Selected
pump
will
operate
immediately if the system switch is set to
MANUAL, and there are no faults. In
AUTO, the pump will come on if there is a
demand for it, and the PLC calls for it.
VFD / Bypass Switch
Enables or disables the VFD:
VFD
This switch position enables VFD
operation in either automatic or manual
mode depending on the position of the
system switch. VFD is the normal position
of the switch.
BYPASS
This switch position, places the
pump station in either "Automatic VFD
Bypass" or "Manual VFD Bypass" mode of
operation depending on the position of the
MANUAL/OFF/AUTO switch. In this mode,
the pumps will start "across the line."
This mode is intended for use only when
the VFD is not functional. Turn all pump
switches to OFF before placing the
system in BYPASS mode.
VFD Selector Switch (Optional On Some
Stations) – PUMP 1 / PUMP 2 / PUMP 3
This switch determines which pump runs on
the VFD when switch is in the MANUAL mode.
However, if this switch is not present, the first
pump with VFD capability runs as the VFD
pump.
When the switch is in AUTO, the pump
selected to run on the VFD has the lowest
accumulated run time. Only one pump at a
time can run on the VFD (also known as an
inverter). Once a pump is running on the
inverter, this switch is disabled. If another
pump is selected when the inverter is in use,
the newly selected pump does not run.
Low Discharge/Differential Pressure
Switch
This switch allows the operator to enable or
disable either the "Low Discharge Pressure"
shut-down circuit, or the filter differential
pressure circuit. Only one circuit can be
overridden at one time, therefore a three-way
switch is used.
LDP OVERRIDE
This position prevents a
low-discharge pressure fault from shutting
down the pump station. Use the LPD
OVERRIDE position during the initial pipe
filling and when restarting the system from
a de-pressurized condition in MANUAL or
AUTO mode.
ACTIVE PRESSURE OVERRIDE
This
activates
both
the
"low
discharge
pressure" and "filter differential pressure"
protection systems. Normally, the pump
station should be left in this position during
