Model Railway Point Control Switch with Indicator and Frog Switching - Code: RK-PSWI
This is a direct control switch (momentary action - centre off) for twin coil point motors
such as Peco, Hornby, Seep or similar. In addition to simply switching power to the point
motor coils, the unit provides an indication of the last switch operation, and a set of
contacts which can be used for frog power switching, Built in diodes absorb switching surges.
Two or more units may control one set of points (e.g. for control from different locations)
in which case each will indicate the last switching action.
Advantages of this system
Disadvantages of the system.
- Full power to coils ensures best reliability of operation.
- LEDs indicate the last operation of the control switch.
- Relay contact outputs to switch frog power.
- Multiple PSWI units in different physical locations, will each
indicate the last operation.
- Built in diodes absorb switch off surges from motor coils.
- Can be panel mounted to represent the layout schematic, and be made up with
different coloured LEDs.
- High operating current for the motor coils needs relatively heavy
wires between supply, switch and motor.
- Needs a heavier power supply (typically 3 amp or better,) or a capacitor
discharge supply. (See below.)
Current draw per unit
Indicating mode - 12V input                 Less than 80mA.
During operation - 12V Coil input         Depends on coil resistance
Capacitor Discharge Supply. Code: RK-CDS
Operating twin coil point motors directly requires a power supply
of around 3 amps or so (or more if several pointmotors are to
be operated at the same time.) A capacitor discharge supply can
provide power to operate these point motors when a basic power
supply of only an amp or so is available. In addition, a capacitor
discharge supply drastically reduces the possibility of burning
out point motors by energising coils for too long.
This unit provides plenty of power (from a massive 30000uF capacitor
bank) for use with Peco, Hornby, Seep or similar twin coil point
motors. LEDs indicators are red for a valid 12 volt DC supply,
and green to show when the unit is ready (recharged to
approximately 10.5 volts.)
One of these units can supply any number of point motors, provided
the unit is allowed to recharge between each operation of a point
motor. It makes the ideal companion for multiple PSWI units (see above,
and the diagram at right.)
The amount of current drawn by the unit when charging is jumper
selectable. Maximum current provides the shortest recharge time,
but current should be selected to match what is available from
the powr supply. On the 380mA setting, 98% charge is recovered
in 3.7 seconds while on the 680mA setting, charge recovery is
2.1 seconds. Once the unit is charged, current draw drops
to approximately 30mA.
Kit price for           RK-PSWI: $19-50           RK-CDS: $24-50
All kits available from :
Aztronics Pty Ltd       Phone 8212 6212
170 Sturt St,                     Fax 8212 4212
Adelaide, SA, 5000.
Information:         David Crosby         email@example.com
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