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descr ip t ion
EPM starter
An EPM unit comprises :- the electrolytic resistance contained
with-in a tank complete with electrodes of asize rated for the
specific kW rating.- the MV enclosure housing the
Shortingcontactor.- an LV enclosure which contains the con-trol
system.
Tank...................................................The tank
is manufactured with heavy dutysheet steel 30/ 10 to 50/ 10 mm
gauge,and is normally supplied complete withlifting eye bolts
Tank capacity and dimensions are deter-mined by the motor
rating. (See character-istics).
The tank is filled through a filling flap andemptied through
valves situated at thebase of the unit, which are normallylocked in
the closed position.Protection: IP54.
Agitator..............................................The
agitator is thermostatically controlledto ensure maximum thermal
capacity.
Electrolyte...........................................Various
concentrations of sodium carbon-ate are normally
employed.Electrolyte level is monitored by a floatswitch and the
temperature is controlledby thermostats.
Electrode assemblies............................A set consists
of three fixed and movingelectrodes; polypropylene containersshroud
the fixed electrodes to provide ad-equate isolation between
phases.The cast alloy electrodes consist of con-centric cylinders
which merge with eachother in the minimum resistance position.
The fixed electrodes, located inside theinsulating containers,
are fed from an in-sulated copper bar.Since this bar does not pass
through thetank wall, there is no danger of electrolyteleakage.
The moving electrodes travel verticallyinside the insulating
container, guided by
a nylon rod. The assembly is supported bytwo brass rods fixed to
a transversal carri-er which is common to all three electrodesand
constitutes the neutral point.Current density is extremely low
(typically1 amp/ cm2 ) resulting in extremely longelectrode
life.
Electrode control system...................... Displacement of
the electrodes is effect-ed by a motor driven worm screw assem-bly.
This is normally controlled by either ageared motor or a servomotor
dependingon the application.An inverter may also be used for
certainapplications.A hand wheel is also provided for emer-gency
operation.Starting times are adjustable from 10 to
150 seconds.
Control and interlockingLimit switches are incorporated to
controlthe geared motor, and to energise theShorting contactor
which shorts out theresidual resistance at the end of the runup
time. The geared motor is fitted withan overload relay, which is
used to pro-vide protection in case of the drive mecha-nism
jamming.An electrical interlock prevents a restartbefore the
electrodes return to the initialmaximum resistance position.If a
power failure occurs during starting,the electrodes return
automatically to the
start position when the supply is restored,so that a new start
is possible.
Control panels.....................................The control
gear is housed in two sepa-rate enclosures. The shorting
contactorcomplete with the rotor terminations arehoused in the MV
enclosure.A separate housing is provided for the LVcontrols.
The MV enclosure is normally includedwith the starter, but for
higher ratings, itmay be supplied in a separate controlpanel.
EPM DUO start er
For starting machines of large powers, orto reduce mechanical
stress, it may some-times be preferable to use two motorstotalling
the rated power rather than a sin-gle one.A dual EPM starter is
then used, to ensureidentical acceleration of both motors.The EPM
DUO comprises two resistanceswhose ohmic values are equalised
be-tween the two tanks. The electrode driveassemblies are
mechanically coupled, soas to ensure complete synchronisation ofthe
movement of the two electrode assem-blies, which are driven by a
commongeared motor.
The two resistances are finally shorted outby a single four or
six pole shorting con-
tactor, at the end of the run-up period.
Heat exchanger starter
The starter is normally equipped with aheat exchanger for these
applications.
This can either be of the water cooledtype, (adequate supplies
of cooling wa-ter must be available on site), or an airblast cooler
can be used.
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Specifications above are subject to modifications without
priornotice.
ordering instructions
The following information is necessary sothat we may provide an
EPM starter cus-tomised to your application.
General operating conditions................ambient
temperaturemaximum and minimum temperaturesrelative humidityheight
above sea levellocation
For the motor(s).................................. power speed
(rpm) stator voltage rotor voltage
rotor current starting torque
For the drivenmachine......................... type coupling
method speed (rpm) moment of inertia number of consecutive starts
setting up and installation requirements
For the starter control gear.................. protection IP 54
or 55 supply voltage for geared motor etc. control voltage
For starter withheat exchanger........... temperature of cooling
water percentage slip for permanent slip
speed variation and duty cycle
Options............................................... speed
control for electrode drive special paint cable entries antifreeze
control anticondensation heaters
EPM 1 to 4 with exchanger
Dimensions in mm
Model Amm
Bmm
Cmax.mm
Dmm
Emm
Fmm
Weight withoutelectrolyte(kg)
Tank capacity(litres)
EPM1 EEPM2 EEPM3 EEPM4 E
2 0 0 02 4 1 02 8 4 03 2 7 0
2 0 0 02 0 0 02 2 9 02 5 0 0
1 6 4 01 7 3 52 0 2 52 2 4 5
8 5 69 5 0
1 1 9 01 4 1 0
6 0 06 0 06 0 08 0 0
1 9 2 02 3 5 02 7 7 03 1 8 0
8 7 01 0 0 01 4 8 01 8 0 0
1 0 0 01 5 0 03 0 0 05 0 0 0
AOIP maintenanceThe EPM starter is robust and easy to operate
and is designed to provide a long and trou-ble free life, even in
the most arduous of environments.AOIP provides a complete dossier
for each project, which includes complete data for identi-fying the
electrolyte, the geared motor, the control gear, the shorting
contactor and all otherancillary equipment which will allow you to
easily identify a component.
AOIP will respond quickly to meet your requirementsIn practice,
each starter is fitted with a rating plate which is unique to each
EPM starter. It isonly necessary to provide us with the serial
number for your EPM starter and AOIP canquickly respond to all your
queries. All our documentation is archived for 40 years and
ourtechnicians are always available to provide worldwide
assistance.
B.P. 182 - F 91006 EVRY CedexTel. 33 1 69 36 50 60
Fax 33 1 60 77 82 97Email: [email protected]
