Liberty Pumps XLSG200 Serie Manual De Instalación página 5

Seal Leak Detection:
All X-Series Grinder pumps are equipped with two mechanical face seals with an intermediate oil chamber between
them. This ensures lubrication for the seals, shaft flame path, and as a barrier to the motor chamber in the event the
lower seal should become compromised. A seal fail or moisture sensing device is located in the mid oil chamber and
continuously monitors for leakage. In the event of a seal failure, moisture mixes with the oil tripping the seal leak circuit.
In a failure condition, a fault light will illuminate and the pump will continue to run; service should be scheduled as soon
as possible.
The ISS and ISD panels by Liberty Pumps have a seal leak test button that tests the integrity of the seal leak circuit
continuity. When pressed, the light should illuminate. If it does not, either the light is burned out or the circuitry is open.
The seal leak module is located inside the panel and requires adjustment upon installation. The seal leak relay
adjustment dial should be set to 75; for best results turn the dial until the light turns on around 125 then turn it back to
75.
Thermal Protection:
The X-Series Grinder pumps are protected from overheating by means of thermal switches located in the motors. For
single phase (1ph) models, a hermetically sealed thermal overload device is mounted on the motor windings and wired
directly in series with the motor's winding, interrupting power in a high heat condition. Three phase (3ph) models utilize
two thermostats mounted in series directly on the motor windings. The thermostat circuit must be connected to a control
panel which will stop power to the pump in a high temperature condition. Both single and three phase (1ph & 3ph)
pumps are constructed with class F materials, with a maximum operation temperature of 311°F or 155°C. Failure to use
the proper circuitry and connection of the thermostat will drop temperature class from T4 to T3 on three phase units.
Note: when connecting a X-Series Grinder pump to an existing control panel, make certain the panel is correctly sized
for the pump. Many panels have a manual reset button for the thermostats on three phase units; this button must be
pressed to reset the system after the pump has cooled. Single phase units automatically reset after the pump has
cooled.
Control Panels:
All X-Series grinders shall be installed with controls equipped with correctly sized and adjusted overload protection
devices. The control panel must be installed outside the hazardous area and appropriately isolated and sealed to
prevent any potential ignition or explosion. Only approved controls that have intrinsically safe float switch connections
may be used for X-Series Grinder pumps. The control and power cables cannot be spliced; a junction box may be used
providing it is rated for hazardous locations and has approved cord connectors.
Pump Installation:
When connecting an explosion-proof pump in hazardous locations using a rail system, it must be of a non-sparking type
design. Contact Liberty Pumps for available models such as GR20NS.
The water level in the sump is determined by the placement of the control floats and should be positioned such that the
pump is completely submerged; if submersion isn't possible, the minimum water depth shall be no less than the depth
defined from the bottom of the pump legs. The upper water level should be positioned to minimize pump starts. The
alarm float shall be above the turn on float switch but below any inlets. No control should be set above the inlet to the
sump.
After the pump(s) have been mounted and the cover sealed, install the remaining discharge line. Piping above the cover
should include a union to facilitate pump removal. A check valve is recommended after the union to prevent the backflow
of liquid after each pumping cycle. A gate valve should follow the check valve to allow periodic cleaning of the check
valve or removal of the pump. The remainder of the discharge line should be as short as possible with a minimum
number of turns, to minimize friction head loss. Do not restrict the discharge to anything smaller than the discharge
connection of the pump. Larger pipe sizes may be required to eliminate friction head loss over long runs. Contact Liberty
Pumps or other qualified person if there are questions regarding proper pipe size and flow rates.
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