HOMA A Series - Manual (Page 4)

A Series
Installation, Operation & Maintenance Manual
Variable Frequency Drives:
Special considerations must be taken when
operating pumps with variable frequency
drives (inverters). The inverter circuit design,
horsepower required by pump, motor cooling
system, power cable length, operating voltage,
and anticipated turndown ratio must be fully
evaluated during the design stage of the
installation.
As a minimum, properly sized load reactors
and filters must be installed between the
inverter and the pump to protect the pump
motor from damaging voltage spikes.
Warranty coverage will not be provided on any
pump motor that is operated with a variable
frequency drive, unless the load side of the
inverter is properly isolated from the pump.
ADDITIONAL PUMP PROTECTIVE
DEVICES
Several optional pump protection devices are
available to protect submersible motors from
damage, and may be provided in your pump.
Temperature Sensing RTD*: PT100 sensors
are available in two critical locations on larger
machines, the lower bearings and motor
windings. N.C. Circuit - 108 ohm
Moisture Sensors: In addition to the standard
seal chamber probe, additional sensors may be
installed in the stator winding, motor cap, or
junction box. These sensors may be either one of
the following:
Moisture Detectors*: These are micro
float switches designed to detect small amounts
of liquid. These are available in the stator
housing of 50hp and larger size pumps.
N.C. Circuit - 268 ohm
Leakage Detectors*: These normally
open, single or 2 wire probes are used to detect
the presence of water in the pump. Single wire
probes use the pump ground to complete
circuit.
* HOMA Go Switch or approved equivalent relay
is required for sensor operation.
MECHANICAL INSTALLATION:
PUMPS WITH AUTOCOUPLING
SYSTEMS
The HOMA Auto-Coupling is a quick removal
system used to prevent personnel from needing
to enter the wet well.
The HOMA Auto-Coupling kit consists of a base,
guide claw flange, upper guide rail bracket,
profile seal and base anchor bolts. Refer to
“Auto-Coupling Parts ID” technical page on
website.
For all A Series pumps, attach the guide claw
flange to the pump discharge flange with the
fasteners and gaskets included with the auto-
coupling kit. Use tightening torques indicated in
the table on pg. 6. Do not over tighten!
Install the profile gasket (if not already installed
at the factory) into the guide claw with the large
diameter fitted into the groove inside the claw.
Refer to the attached instructional sheet for
proper profile gasket installation.
Install suitable lifting chain of an adequate size
and length to permit proper lowering and raising
of the pump.
Properly locate the base, and with suitably sized
anchor bolts, fasten it to the floor of the pump
station. Make sure when locating and securing
the anchor bolts that the base will align properly
with the access cover at the top elevation of the
station. Place the base in position, and level the
base.
If the base is not level, proper sealing of the
pump to base may not occur!
Pg. 4