Gotec ET Series User manual

GOTEC SA Rue des Casernes 59 CH-1950 Sion Suisse
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Pumps type ET_ - EK_ - EM_
Release 98.09.18
Instruction manual
1. Description
1.1. General
ET_ - EK_ - EM_’s type are compact solenoid driven oscillating piston
pumps.
The pump and the driving mechanism are integrated without any
shaftseal in a totally waterproof system.
The pump is self priming to a height’s difference from 1 to 3 meters
according to the type of pump, which limits itself automatically its
maximal pressure.
1.2. function mode
The piston (5) is moved by the
electromagnetic field generated by
the single wave diode rectified
current flowing through the coil (4).
Each current pulse moves the
piston against the pressure spring
(3). This movement, by reducing
the volume in the suction chamber,
opens the valve (6) set in the piston
to let the liquid run to the pressure
side.
When the current pulse dies the
pressure spring pushes back the
piston toward the pressure side.
The increase of pressure closes the
piston valve (6) and the liquid flows
through the valve (7) set in the
pressure connection (8) and into
the pressure pipe.
pressure connection
valve
valve
piston
coil
pressure spring
valve
suction connection

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This movement creates a low pressure in suction chamber which opens the
valve (2) set in the suction connection (1). The liquid is sucked into the pump
and the cycle starts again , 60 times per second (60 or 50 Hz, depending the
mains’ frequency).
The piston size and the length of its displacement define the flow rate.
The pressure limits itself automatically, and if the liquid flow is stopped, the
pump will continue to run without damage .
The pumps works not only tied to the standard tension and frequency but can
be piloted by a frequency regulation or a pulse control unit.
The ground elements, piston and bushing, guarantee a minimum wear and a
high life’s duration.
By the use of different materials the pump can be employed with a wide range
of mediums at different temperatures.
1.3. Markings
1.3.1. Individual label of pumps type ET - EK
7
8
9
1
2
3
4
5
6
ETS 17-P/B : Manufacturer type classification
ETS : Model of end fittings - (plastic barbed tube)
17 : Type of pump - (tied to the pressure : 1,7 bars)
P : Materiel of sealing - (Perbunan

)(NBR)
B : Other descriptions - (piston’s bushing in bronze )
NR. : 104744 : Manufacturer fabrication classification
V 230 50Hz : Voltage and frequency supply
40W : Power of the pump (Watt)

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FA-NR: 804088781 : Individual pump number (follow up)
8 : Year of fabrication - (1998)
04 : Month of fabrication - (04 = April)
088781 : Individual number - (88781th pump tested on
the automatic control bank)
GOTEC SA : Logo +manufacturer name and address
CH- 1950 Sion
: Flow direction
: Label of conformity (CE= European norms)
:Swiss distinguishing security sign
1.3.2. Individual pump’s label type EM
1 6
2 8
3 7
4
5
1: EMS 10-E/O : Manufacturer type classification
EMS : Model of end fittings - ( for soft tubing)
10 : Type of pump - (tied to the pressure : 1,7 bars)
E : Seals & valves material - (EPDM)
O : Other descriptions - (without piston’s coating)
2: NR. : 106098 : Manufacturer fabrication classification
3: 230 V / 50Hz / 18W : Voltage and frequency supply / Power consumption.
4: FA-NR: 980488835 : Individual pump number (follow up)
98 : Year of manufacture - (1998)
04 : Month of manufacture - (04 = April)
88835 : Individual number - (88835th pump tested on
the automatic control bank)
5: GOTEC : Logo + name +address of manufacturer
1950 Sion (SWITZERLAND)
6:: Flow direction
7:: Label of conformity (CE= European norms)
8:: Swiss distinguishing security sign
1.3.3. Molded label

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The following two types of inscriptions are molded on the coil body G15, G17
and G21:
- G15 or G17 or G21 : type of coil
- 24V~or 100V~or 110V~ou 230V~ : voltage and alternative current
mark.
- 60 or without mark : frequency (60 or 50 Hz)
The following two types of inscriptions are molded on the coil body G08 :
- 230V/50-60Hz : Voltage and frequency (as well as 110V/60Hz,
24V/50-60Hz and 12V/50-60Hz)
- 100% ED : Using factor
1.4 Performances
See the general prospectus or the technical data sheets.
2. Use
2.1. Mounting
To avoid any kind of twisting, forcing and exaggerated pulling on
the electrical wiring, it is recommended to fit the hydraulic tubing
first.
To avoid a possible clamping of the piston by solid particles
present in the fluid, the mounting of a filter before the pump is
needed.
2.1.1. Hydraulic
It might be easier to connect the tubing before fastening the pump in its place.
The ETS and ETX models with barbed end fitting request to force a soft plastic
pipe (PVC, ...) with an inner diameter of ~8 (mm) around the barbed plastic
(ETS) or stainless steel (ETX) end fitting set in the pump. The plastic pipe
should be slid until its covers completely the teeth or the swelling of the fitting.
This mounting will be assured by the use of a metallic clamp which avoid the
loosing of the pipe.
The connection parts with inner- or outer-threads request a complete
screwing of the adapter on the end fitting. M10X1 (ETK & ETU) or G1/8 (ET &
ETG). The waterproof between the pipe’s adapter and the end fitting of the
pump should be made by an O-ring or by a Teflon tape.

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The plastic tube should not be bent too much sharply to avoid pinching,
mostly, on the suction side of the pump.
The tube’s quality is chosen in function of the using pressure’s pump.
2.1.2. Fastening
Type ET: The four holes inside the corner rivets holding the metal stacking
allow the mounting of M3 screws to fasten the pumps into any board. It is
recommended to add a damper (rubber feet) between the pump and the board
to absorb the 50 or 60 Hz line frequency.
Type EK: The nozzles allow a mounting with stirrups. It is recommended to
add a damper (rubber feet) between the fittings of the pump and the board to
absorb the 50 or 60Hz line frequency.
Type EM: Due to its light weight, the EM type could be simply hang from its
tubing. The nozzles allow a mounting with stirrups too, in this case, it is
recommended to add a damper (rubber feet) between the end fittings of the
pump and the board to absorb the 50 or 60 Hz line frequency.
It is important to leave a free space around the pump to let it move freely
so it will not rub or knock.
2.1.3. Electrical
The electrical wiring is done in accordance to the following diagram :
L1
N
Fuse
Diode
Pump
The electrical connection to the pump is made with receptacles flat female
plug connectors (DIN 46247) 6.3 mm wide. It is recommended to use plastic
housing or thermoretractile sheath for the connectors to avoid any accidental
contact with the metal.
220V and 110V need a diode n° 1N 4007 or with similar characteristic :
- Nominal current : 1 A
- Shock current : 30A (8ms)

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- URN : 1000 V
- Pick tension : 1200 V
- UFat IF: 1.2 V
Which is set on one of the incoming line.
If the tension is equal to 12V or 24V the nominal current of the diode has to be
more than 6A.
A fuse of maximum 0.5 A (for 230 V) is added along the circuit.
When the pump is switched off, a induced tension of several hundreds volts
may be generated. So it is recommended to put a varistor (VDR) (oxide
metallic varistance) to attenuate this tension. This condition is valid for all types
of pumps.
This electronic part must be mounted after the diode and the fuse, parallel to
the pump (see electronic diagram). This mounting is necessary when the pump
is stopped and started often by a commutator or a relay. The VDR will avoid
the sticking of the commutator’s contacts and protect the coil against a
possible breakdown.
Characteristics of the varistor :
-Ueff : 275 VAC
-Response time : ~<25ns
-Admissible permanent charge : >=1W
The ET_ series pump may be connected to ground by riveting or fastening with
a M3 screw, a connection cable terminal to one of the four holes, which are in
the corners of the steel laminated body.
The EK_ series pump may be connected to ground by drilling a hole in the
metallic frame of the pump and fastening a connector cable terminal.
CAUTION : Not damage the coil during the drilling of the hole.
The EM_ series pump already has a ground connector. The connection
diagram is draw on the label of each pump.
L1
N

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When the electrical connection is done, any contact with parts under
electric tension must be avoid. The electrical connections have to be
insulated with a plastic house or with a thermoretractible sleeve.
During the mounting of the pump, watch carefully that the pump’s
connections must not come in contact with any liquid coming from
defective tubing or fitting.
Pumps mounted in permanent installations have to could be disconnect
from the main by a switch effective on the three wire, with at least a
contact opening of 3 mm wide.
2.2. Using the pump
It is strongly recommended to never let the pump run without liquid for
more than a few minutes.
Applying the current makes the piston run immediately. A fairly high humming
sound is heard until the liquid reaches the pump.
After a variable time the warming up of the coil will slightly decrease the flow
rate performances of the pump. A part of the electrical energy is turned into
heat rather than mechanical strength, The pressure is almost not influence by
this.
When the pressure rises to its maximum the pump come close to a stop, the
piston keep on moving very slightly but the flow rate is roughly null. The liquid
flows back along the clearance let between the piston and the brass (stainless
steel) jacket. The pump warms up but handles this condition without damage.
The pump can be started with any level of back pressure as long as this
strength is at the most equal to the maximum pressure accepted by the pump.
2.3. Maintenance
The ET_ - EK_ - EM_ pumps are free of maintenance. They are not suppose
to be dismounted by the customer.
The warranty is tied to the strict observance of this rule.
3. Security

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

The respect of the mounting instructions (2.1.1. Hydraulic, 2.1.2.
Fastening, 2.1.3. Electrical) brings a total security to the customer.


The following dielectric tests are applied to:
coils during the manufacture : 5000 volts for 2 seconds
assembled pumps type ET_ - EK_ : 3500 volts for 1second
assembled pumps type EM_ : 2500 volts for 1second
3.1. general precaution


The ET_ - EK_ - EM_ are devices made to pump liquids. Any other
kind of uses are prohibited.


The pumps generates warmth (45-60°C), which can hurt lightly. It is
recommended to mount the pump in a way to avoid any accidental
contacts.
The pump should not be hit. The plastic end fitting are breakable, the brass
and stainless steel end fittings might be crushed if the pump is dropped.
The coil body, black plastic part inserted in the metallic block, reaches an
average temperature of 45 to 60 °C under normal use. This heat must be
evacuated, so foresee space around the pump.
The pump weights 450 to 600 grams and must be handle with attention to
avoid injuries.
The pump vibrate at 50 or 60 (Hz). Cares must be taken to keep clear of
contact with other fastened parts.
The two electrical connections (plus & minus) must be protected against a
common metallic contact which will turn into a short circuit. It is recommended
to use plastic housing for the connectors to avoid any accidental contact with
electrical conducting materials.
3.2. Dry running
A long dry running will conduct to :
The melding of internal parts.
The stop of the piston movement.
The overheating of the coil.

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The fusion of the copper wiring, what will stops the run of the current.
The blow up of the fuse by short circuit.
The pump might stop by seizure at any time through this process.
Gotec SA
Sion, September 18, 1998