Models and Electronics
SW30 R/C Relay Switch
SW30 RELAY SWITCH UNIT
Thank you for buying an AsTec Product. With a little care it will give you hours of good service and enjoyment. To ensure its reliability we have used nothing but the best parts available. We have done everything in our power to ensure that the unit that your unit will function correctly, but in the unlikely event that you have a problem please do not hesitate to contact us.Specification:
| *Current | 30 Amps Maximum switched current |
| *run time at rated output | no limit |
| *Instantaneous Current (not repeated) | 64 Amps |
| *Input Voltage | 1-12 cells (BEC requires 5+ cells) |
| *BEC/Brake | Optional |
Setting up.
The BEC if fitted may be de-selected by cutting the small gauge red wire loop by the battery +ve lead. An on/off switch may be fitted in this lead but keep wires as short as possible. The unit has a FUTABA type plug. Before plugging the unit in check that the wires are in the correct positions for your receiver. If they are not remove them by lifting the small plastic tab or pressing the small metal tab (depending on the type of connector) and pulling the lead free. Re-insert the lead in the required position and check that the retaining tab is fully seated. The plug can be trimmed to fit the majority of receivers. Battery and Motor connectors are left to your preference, use the best you can afford! Keep the power leads as short as possible and suppress the motor properly to ensure that no noise is transmitted to the receiver.Connections are:
Red Battery +ve
Black Battery -ve
Red Motor +ve
Yellow Motor -ve
Thin Red - BEC select (optional).
Thin Black - brake select (optional)
Red power leads are optional and are only on BEC and/or Brake versions of the switcher.
With the unit disconnected from the motor battery connect the unit to the receiver (with receiver battery connected) and turn the transmitter and receiver on. With the throttle stick in the centre position adjust the adjuster (top right) until the relay just clicks. Moving the stick between full down and full up should switch the relay.
Servo reversers may be used to change the direction in which the relay picks. You can use a small motor and small battery pack to check the operation of the unit.
When you are satisfied connect the unit to the motor you will normally run and the battery pack (If your unit has BEC remove the receiver battery) and test it out under no load conditions, in particular check the rotation direction of the motor!. When satisfied install it in your model and off you go.. The brake circuit if fitted will operate when the relay drops (transmitter stick in the off position).This may be de-selected by cutting the small black wire loop from the unit. Its effects may be moderated by inserting a low value resistor in the black wire loop. Something like 10 ohms at 1 watt will give a good starting point but the best value depends on the motor used and the application so a little experimenting may be required.
NB. The BEC MUST BE DISABLED IF YOU ARE USING A RECIEVER BATTERY PACK. DAMAGE MAY RESULT TO EITHER THE SWITCHER OR RECIEVER BATTER OR BOTH.
IMPORTANT
You must recheck the set up if you change radio's. The switcher unit needs 5 volts to pick the relay, When the battery voltage drops the relay will eventually release. When this point is reached there may not be sufficient voltage left to re-pick the relay immediately. If you wait for a short time the battery voltage will rise enough to pick the relay and get power back on your model for a short time.ELECTRONICS AND WATER DO NOT MIX. GETTING THE UNIT WET COULD CAUSE MALFUNCTION AND LOSS OF CONTROL.
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