Electronize Speed Controller Type FR15HX & FR15HVR
Wiring
The system operates with a common negative ground connection between the receiver circuit and speed controller. The two black leads are connected internally and there should be no other connection between the batteries, if separate batteries are used. Having the common connection point at the speed control will minimise interference between the two circuits. Any other wire between the two batteries will inject motor noise (electrical noise) into the signal path and may cause interference problems. The controller is designed to produce a minimum of interference but unfortunately motors are not.
Fig. 1 shows a typical arrangement. The red wire in the receiver/servo lead either feeds 5 volts out to the receiver, when a type FR15HVR with BEC is fitted, or supplies 5 volts to the speed controller if a type FR15HX and separate receiver battery are used. In most cases a suitable connector can be fitted to the three thin leads and plugged straight into a servo connection on the receiver. A small connector moulding, which will fit most receivers, is supplied and connector inserts are already fitted to the receiver/servo lead. These inserts should be pushed into the moulding in the positions which match your receiver.
The inserts should be fitted so that the step on the insert will latch against the finger in the moulding and lock it in place. If they are inserted the wrong way round they may slide back and not make contact with the pins. You must get each insert in the correct position first time!
You must check which pin is which connection on your particular receiver. The important thing is not to reverse the supply between receiver and speed controller as this may cause damage to one or the other.
IMPORTANT The connector supplied is not polarised and can therefore be reversed when plugged into the receiver. Always take care to plug in the right way round otherwise damage may be caused.
The wiring to the motor is straight forward but any connectors should be suited to the high current that the motor may draw.
A fuse should be included to protect the controller and wiring. This has the disadvantage of introducing an additional volt drop but may prevent damage to the controller or wiring. If the fuse is not fitted and the motor battery is accidentally reversed the controller will be seriously damaged.
When the receiver battery (or BEC in the case of a FR15HVR) is switched off the speed controller will draw only a very small current from the motor battery. Because of the 15 amp. rating you may prefer to omit a motor battery switch. However, the motor battery should be disconnected when not in use. Several motors can be operated from the same speed controller provided the total load does not exceed the 15 amp. rating of the controller. Motors can be connected in series or parallel, whichever suits the battery voltage and current rating. For example with a 6 volt battery, motors will invariably need to be connected in parallel so that each motor receives the full 6 volts and not 3 volts. With a 12 volt battery it is often convenient to use the more common 6 volt motors connected in series, each receiving half the battery voltage. When motors are connected in series there is a "differential" effect which allows the motors to run at completely different speeds, or even for one motor to stall, if the loads are not balanced. This is because the motors pass the same current and therefore produce the same torque irrespective of speed. This reduces the risk of overheating one motor due to a fouled prop, although the other motor will operate at increased voltage. On the other hand, operating the motors in parallel will allow either motor to produce extra torque which may clear any fouling. The motors will also run at the same speed when connected in parallel even when the loads are slightly different.
Take care not to reverse the motor battery as this will damage the speed controller. The wiring should be kept short and tidy. The motor and battery wires should be taped together and not spread out to form open loops. The signal wires should also be kept apart from the motor circuit. This not only looks neat but will also reduce the risk of interference from the motor. The speed controller has built in suppressor capacitors but, in extreme cases, suppressor capacitors can be fitted to the motor in the normal way.
The metal back of the case dissipates the heat from the Power MOSFET. If the control is to operate with a continuous current of more than 10 amp. it should be mounted so that air can circulate round the back of the case. reduce the total current to 1/8 but only reduce the models speed by 1/2.
For full docuement click Here
