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Operating instructions
Version 08/09
Brushless Boat Control
Item No. 20 50 79
Item No. 20 50 81
Intended use
The cruise control is only intended for private model building. It is connected to a free channel in a remote
control receiver for model boats and can then be used for continuous adjustment of the rotational speed
of a brushless electric motor.
This product complies with the legal, national and European regulations. All names of companies and
products are trademarks of the respective owner. All rights reserved.
Safety instructions
The warranty will be void in the event of damage caused by failure to observe these
safety instructions! We do not assume liability for consequential damage!
We do not accept any liability for personal injury or damage to property caused by
incorrect handling or non-observance of the safety instructions! The warranty will be
void in such cases.
• The unauthorised conversion and/or modification of the product are inadmissible for safety and approval
reasons (CE). Never dismantle the product. It does not contain any parts that require adjustment or
maintenance by you. The warranty will be void if you do so!
• The product is not a toy and should be kept out of the reach of children!
• Do not leave packing materials unattended. They may become dangerous playthings for children.
• Always observe the correct polarity of the connection cable when connecting the cruise control to the
rechargeable battery. Use polarity proof plug connectors as the cruise control will be destroyed when
connected with the wrong polarity.
• Only operate the cruise control within the admissible voltage and current limit values (see section
"Technical data").
• Always disconnect the rechargeable battery from the cruise control when the cruise control is not in use.
• Always switch on the transmitter first before connecting the cruise control with the rechargeable battery!
• The cruise control must be disconnected from the rechargeable battery before switching off the
transmitter.
• The cruise control can get very hot during operation. There is a risk of burns! During operation, ensure
sufficient ventilation of the cruise control and a faultless function of the water cooling system.
• When handling rechargeable batteries, cruise controls and electric motors with ship propellers, make
sure that no body parts or items are close to the slewing range.
• The power input of the connected motor must not exceed the maximally admissible current specifications
of the cruise control.
• Only operate the cruise control with a rechargeable battery package, never with a mains adapter.
• Only connect one electric motor to the cruise control.
• The cruise control is not intended for use with common electric motors with 2 connections, but only for
operation with a brushless electric motor with 3 connections.
• During installation, maintain the maximum distance between receiver and cruise control to avoid
reciprocal interference.
• Do not lay the antenna line of the receiver parallel to conducting cables.
• Sufficient cooling of cruise control and motor must be ensured when operating the model. The water
cooling system must be connected to the cruise control in accordance with the operating instructions for
the boat model. For correct flow direction of water (inlet/outlet of the cruise control), please observe the
indications on the cruise control.
• Check the cruise control and the cables with plug connections regularly for damage. If you detect
damage, do not use the cruise control any longer.
• The rechargeable battery must be disconnected from the cruise control before recharging it.
• Handle the product with care. It can be damaged by impacts, blow and falls even from a low height.
Connecting the cruise control
1 Connection cables of the rechargeable battery (red = positive/+, black = negative/-)
2 Connection cable of the receiver
3 Connection cables of the motor
4 Inlet/outlet of water (for flow direction of water, see indications on the cruise control)
2
1
The connection cables of the rechargeable battery (1) of the cruise control have "open" cable ends.
Depending on the plug system used for the battery, the appropriate and polarity proof plug connections
must be soldered on.
If 3.5mm sockets are already mounted to the three motor connections (3) of the cruise control, mount
appropriate connection plugs to the motor.
Connect the cruise control with the motor and connect the 3-pole receiver connection cable (2) to the
receiver output, which is responsible for the motor control. Always also observe the documents enclosed
with the receiver for correct connection of servos and cruise controls.
Observe the correct arrangement of the plugs at the receiver connection (black/brown cable =
negative/-, red cable = positive/+, white/orange cable = pulse signal).
Connect the water inlet/outlet (4) with the respective inlet and outlet lines of the boat model using
appropriate hoses. Always observe the operating instructions of your boat model. Indications for water
inlet and outlet can be found on the cruise control to ensure the correct flow direction.
Start-up of the cruise control
• Switch on the transmitter.
• Move the control stick for motor control into the neutral position (central position).
• Connect the battery with the cruise control.
• The cruise control emits several beeps ("do-re-mi-di"), after which the cruise control is ready for use.
• The motor starts when you move the control stick for the motor function slowly from the neutral position
to full throttle (forwards or backwards).
Motor cut-off
The cruise control measures the actual battery voltage when the battery is connected.
The motor is switched off to protect it from total discharge, if the battery voltage drops below 70% of the
initially measured voltage.
Disposal
Technical data
Item No.
Number of cells NiMH/NiCd
Number of cells LiPo
Max. current, 5 minutes
Max. current, 10 minutes
Max. current, 1 second
Power output
Motor type 7.2-7.4 V
Motor type at 11.1-12.0 V
Pulse frequency
BEC
Dimensions (without cable)
Weight
Voltage monitoring
Overtemperature protection
4
3
These operating instructions are a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1,
D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in
technology and equipment reserved.
© Copyright 2009 by Conrad Electronic SE.
When installing the plugs, always observe the correct polarity as the cruise control will be
damaged otherwise. The polarity of the battery connections is colour-coded. Red = positive (+)
and black = negative (-).
Important!
As the cruise control has a built-in BEC, no other power source must be connected to the
receiver.
Ensure that nothing can come loose or move in the electric motor and the entire model even
at full power output. Make sure that the ship propeller and the connected motor shaft can rotate
freely. Clear away loose items such as paper, foil, cloths, clothes and other light material so
that they cannot be sucked in. Never reach into the slewing range of the propeller! Risk of
injury!
If the direction of rotation is incorrect, swap two of the three motor connections (3). Never swap
the connections of the rechargeable battery!
Check the forwards/backwards function of the cruise control; the reverse function of the
transmitter may have to be activated or you swap two of the three motor connections (3) as
described above.
Caution, important!
Only connect a fully charged battery to the cruise control! Otherwise, there is a risk of total
discharge.
Please dispose of the device when it is no longer of use, according to the current statutory
requirements.
205079
6 - 10
2 - 3
25 A (at 7.2 V)
35 A (at 7.2 V)
50 A (at 7.2 V)
max. 180W
2000kV
1,500kV
31 kHz
5 V/2 A
ca. 58 x 26.5 x 13 mm
ca. 44 g
yes (cut-off at 70%)
yes, ca. 95°C
205081
6 - 10
2 - 3
35 A (at 7.2 V)
45 A (at 7.2 V)
80 A (at 7.2 V)
max. 250W
2,500kV
2,000kV
31 kHz
5 V/2 A
ca. 60 x 26 x 14 mm
ca. 47 g
yes (cut-off at 70%)
yes, ca. 95°C
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