MYERS SX50, Инструкция по установке и обслуживанию

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under normal operating conditions. An air space
above the oil level in both the seal and motor
chambers is provided to allow for the expansion of
the oil when at operating temperature. The power
and control lines are sealed and strain relieved on
the outside entrance with a standard cord grip, and
internally through the use of a dielectric potting resin
surrounding the electrical wires.
Internal connection wiring diagrams are shown in
Figure 8. All of the pump fasteners and shafts are
made from corrosion resistant stainless steel, while
the pump castings are made of ASTM A-48 Class
30 cast iron, and the multivane vortex impellers are
made from Class 20 cast iron.
General Installation: Various configurations and
methods of plumbing this series of sump pumps may
be used.
Note: If the SX50/SX50H hazardous location
pumps are used in conjunction with a rail lift-out
system, it must be a UL or CSA listed nonsparking
system for hazardous locations.
IMPORTANT: If the following guidelines are
not followed, the CSA hazardous location listing
is void.
These pumps are to be used for handling septic tank
effluent, sewage, and storm water only. Do not use
in other hazardous locations. These motors must
be repaired and serviced only at a Myers authorized
service center or at the Myers factory. Any
unauthorized field repair voids warranty and the
hazardous location rating.
CAUTION: After the pump is installed and
sewage has entered the basin there is Danger.
Sewage water gives off methane and hydrogen
sulfide gases, which are poisonous. Never
enter a wet well unless the cover is open for a
sufficient period of time to allow fresh air into
the basin. It is recommended that a man in
the basin have a harness on with a rope to the
surface, so that he can be pulled out in case of
asphyxiation. It is for this reason that Myers
recommends using the rail lift-out system so that
no service is required inside the basin.
Motor: Each motor is provided with heat sensor
thermostats attached directly to the motor windings.
The thermostats open if the motor windings see
excessive heat and, in turn, open the motor
contactor in the control panel, breaking the power
to the pump. When the motor is stopped due to an
overheat condition, it will not start until the motor has
cooled and the heat sensor reset button is manually
pushed on the front of the Myers control panel.
This circuitry is provided in the Myers control panel
designs.
The SX50/SX50H pumps are equipped with
internal thermostats. The SX50/SX50H models
are designed to meet Class B heat rise of 266°F
(130°C).
Note: Failure to use proper circuitry and to connect
the motor overheat protection in the control panel
would negate all warranties and CSA Listings.
Motor Seal Failure Warning: The seal chamber is
oil filled and provided with moisture sensing probes
to detect water leakage through the lower shaft seal.
The probes can also detect moisture present in the
upper motor housing.
The presence of water energizes a red seal leak
warning light at the control panel. This is a warning
light only, and does not stop the motor. It indicates
a leak has occurred and the pump must be repaired.
Normally, this indicates the outboard seal has
leaked. Allowing the unit to operate too long after
the warning could cause upper seal leakage along
with motor failure.
The resistance across the moisture sensing (seal
failure) probes should be checked after a seal
leak warning light has lit. This can be done by
disconnecting the red and orange control wires from
the control panel, and measuring the resistance with
an ohmmeter between the wires. The SX50/SX50H
reading should be above 30,000 ohms. If the
measured values are below those indicated above,
the pump may have a lower seal failure and
require service.
On the Myers control panels the seal leak test switch
tests the seal leak circuit continuity. When pushed
the seal leak test bulb should light. If the test bulb
does not light it means either the wiring circuitry to
the seal leak probes have been broken or the bulb
has burned out.
Note: Myers built control panels supply the correct
circuitry for moisture and heat sensor connections.
Failure to install the correct circuitry with proper
connection would negate warranty and CSA Listing.
See Figure 7.
Motor Power Cord, Control Cord and Cord
Cap Assembly: Each motor power cord has 4
conductors – white, black, red and green. For a
single phase motor the black is connected to the
common lead, the white is connected to the main
lead, while the red is connected to the start circuitry,
and the green is attached to a good ground. The
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