User manual FUTUBA FSU2

[. . . ] When the power supply voltage drops, a battery fail safe (B-F/S) function turns on and moves the throttle servo to the preset position (brake or engine slow). Compact and lightweight design does not affect servo performance. Responds quickly to erroneous operation by interference, etc. [. . . ] Do not connect the FSU2 to reverse polarity. * Repair may be impossible. NOMENCLATURE AND SETTING Monitor Lamp (LED) Monitor lamp will light at F/S condition and repeat turning on and off at B-F/S condition. At normal condition, monitor lamp will blink once or twice depending on the preset activation voltage of B-F/S function. It is adequate that the monitor lamp blinks once for a four-cell NiCd battery and twice for a five-cell NiCd battery. Setting Switch (Set) This is the switch to set the activation voltage of B-F/S function and to set the servo position for F/S function. Do not use the FSU2 where it will be directly exposed to water, oil, etc. *The FSU2 does not have waterproof construction. When using the FSU2 where it may be exposed to water, exhaust gas, etc. , waterproof it by placing the unit in a leakproof plastic bag and securing the open end of the bag with a rubber band. Do not connect more than one servo to the output side of the FSU2. Never use a cable splitter to connect multiple servos. Install the FSU2 where it will not directly touch other parts, even if the model crashes. Servo Connector To Receiver DESCRIPTION OF OPERATION NORMAL OPERATION The FSU2 relays the signal from wheel, triger, or stick to its corresponding servo without any delay under the normal operation. REPAIR SERVICE Before requesting repair, please refer to this instruction manual again and verify your settings. If you are still experiencing trouble, please request service as follows: Address Your nearest Futaba dealer. Repair information Describe the trouble in as much detail as possible. Symptom: Including the state of the set when the trouble occurred. Digital proportional set used: Transmitter, receiver, and servo model numbers. Your name, address, and telephone number. SPECIFICATIONS Usable receiver power supply Nicd 4 cells (4. 8V): Cells with a capacity of 270mAh or more Nicd 5 cells (6. 0V): Cells with a capacity of 500mAh or more 6V supplied by BEC internal control amp or regulator Operating voltage 3-7V B-F/S detection voltage 4. 8V mode: 4. 0 ± 0. 3V 6. 0V mode: 5. 0 ± 0. 3V Current drain Approx. 10mA Input/output pulse width 900-2140µsec Input/output frame width 7. 8-22. 8msec Size / Weight 15. 8x21. 8x7. 7mm (excluding projecting parts) / 6g F/S FUNCTION OPERATION Operation by interference When the interference is weak, the servo horn will intermittently try to move to the F/S set position. If the set position is correctly set at the brake or throttle slow side, it will be difficult for the throttle to fly up and the FSU2 will return the servo to the throttle slow side. When interference is strong, the F/S function will hold the throttle servo in the preset position. When the interference disappears, the FSU2 will immediately return to the normal operation. When there is strong interference on the same band nearby and the F/S function is turned on instantly, the other transmitter will control the model. In this case, just because the FSU2 is installed does not mean that loss of control can be prevented. [. . . ] A dry cell battery cannot endure a large current draw. If installed in the model, the voltage will frequently drop even through the battery is new. Mark Meaning Procedures which may lead to a dangerous condition and cause death or serious injury to the user if not carried out properly. Procedures which may lead to a dangerous condition or cause death or serious injury to the user if not carried out properly, or procedures where the probability of superficial injury or physical damage is high. [. . . ]