Dual power supply which converts the M signals of five popular receiver systems to S.Bus and PWM signals. The system offers the possibility to connect up to 36 servo motors.
With the S.Bus system, several servo motors can be connected to the DPSI 2018 with just one single S.Bus cable. Consequently, there is only one cable that needs to be run through the fuselage to the tail and two additional cables to connect the wings.
The servo motors can be connected to the S.Bus cable at the very spot where they are needed using special S.Bus terminal blocks. Each servo motor can be addressed via its own unique identifier.
The connected S.Bus servo motors can be programmed - e.g. using a laptop - directly via the receiver input of the DPSI 2018.
Channel set-up, pulse width, rotation direction and delay between pulses etc. can be conveniently adjusted using the computer software.
With S.Bus terminal blocks that have a special PWM adapter, even conventional servo motors can be connected to an S.Bus cable. In this case the terminal blocks are adressed and programmed via an own unique identifier not the S.Bus servos.
Multi Transmitter compatible
At the moment, the new dual power supply DPSI 2018 can be used with five popular receiver systems:
- Futaba S.Bus / S.Bus 2
- Spektrum DSM2 / DSMX
- Multiplex M-Link
- Graupner/SJ HOTT
- Jeti duplex PPM / EX Bus
The DPSI 2018 is compatible to the Jeti duplex 2,4EX telemetry. The connected receivers (RSat2) must be plugged to the DPSI 2018's COM ports with an adapter cable. So also telemetry transmission is redundant. All important parameters of the DPSI 2018 will be transmitted in real time to the Jeti transmitter (or to the JetiBox). In total 15 parameters giving information of the recent status of the receiver system will be transmitted. Among this are:
- Voltage of both connected receiver batteries
- Current per battery and total current of the dual power supply
- Recent output voltages of the three outputs "A", "B" and "C"
- Receiver quality of both receivers in percent
- Temperature of the DPSI 2018's heat sink
- Used capacity per battery and used capacity of both batteries in total
- Available remaining capacity from both receiver batteries
Additionally to the telemetry data also errors from the receiver systems will be transmitted (e. g. undervoltage, cable break, receiver errors, etc.). A morse code that can be outputted acoustically by the transmitter is assigned to each error type. The user also can set threshold values in the transmitter and assign individual speech output when these will be exceeded or deceeded.
To achieve receiver redundancy, two receivers or up to four Spektrum satellite receivers can be connected. The DPSI 2018 automatically identifies and chooses the receiver with the best signal strength.
PWM adapter for standard servo motors
With the aid of PWM adapters, even standard servo motors can be used in the DPSI 2018's S.Bus system. The PWM adapters are available as S.Bus terminal blocks or as an assembled S.Bus lead.
The DPSI 2018 can be used with any accessories that fit Robbe's PSS 2018. All S.Bus wing leads and adapter cables, S.Bus terminal blocks, PWM adapters etc. are fully compatible with the new dual power supply DPSI 2018.
Configuration and rating
The DPSI 2018 has four S.Bus outputs which are arranged in pairs. Each pair has its own voltage supply that can be set to 5.4V, 6.0V, 6.6V or 7.4V.
The dual power supply can handle 20 amps continuous current and - for a short period of time - up to 50 amps peak current.
Besides the S.Bus outputs, the DPSI 2018 also features ten additional ports for standard servo motors.
Flight data memory
The DPSI 2018 has a built-in SD card slot. The most important flight data - e.g. current, voltage and battery capacity - can be recalled via the attachable LCD box or saved to the SD card.
|Power source||5, 6, 7-cell NiCd / NiMH, 2-cell LiPo, LiFePO4, LiIon|
|Operating range||5.5V to 13.2V|
|Nominal input voltage||6.0V to 8.4V|
|Quiescent current (turned off)||Approx. 1µA per battery|
|Quiescent current (turned on)||Approx. 220mA (without receiver)|
|Maximum continuous current||20A|
|Maximum peak current||50A|
|Drop-Out loss @ 4A||Approx. 0.4V|
|Maximum dissipation loss (over time)||12W (with cooling fan 20W)|
|Receiver systems|| |
|# of servo motors||Up to 36 servo motors|
|CE marking||According to 2004/108/EC|
|Permitted temperature range||-10°C to +70°C (14°F to 158°F)|
|LCL filter (EMI)||For each servo motor output|
|Dimensions||122mm x 80mm x 33mm (4.8in x 3.15in x 1.3in)|
|Weight||Approx. 200g (220g with fan), approx. 7.05oz (7.76oz)|
- Using PWM adapters, standard servos and other electronically equipment can be connected, too.
- The special advantage of the S.Bus system is the 3-wire cable from the receiver into the dual current supply but still transmitting 18 channels.
- Therefore, the receiver can be easily positioned at a place where receiving is best (e.g. in the cockpit) while the dual current supply is placed further down in the fuselage.
- Dual safety by two receivers. Two (or up to four) receivers can be connected to the input. The battery switch contains automatic switching between receivers, dependant on signal strength. This is important for huge model aircrafts over 25 kilograms / 55 pounds where two receivers are mandatory.
- The DPSI 2018 is appropriate for four receiver systems: Futaba S.Bus / S.Bus 2, Spektrum DSM2 / DSMX, Multiplex M-Link, Graupner/SJ HOTT and Jeti duplex PPM / EX Bus.
- Bus-Concept. A slightly thicker 3-wire S.Bus cable (1mm² / AWG 17) leads from the dual current supply to the servos, for example one cable leads into the fuselage, one to the rear and additionally one or two into the wings. The servos connect to the S.Bus at desired positions using special S.Bus connectors. Hereby, complexity for cabling is reduced enormously. Because the many conventional cables are heavy, this system is saving weight. Furthermore, two or more servos can be placed at an arbitrary position if the power of one servo is not sufficient. Using the S.Bus connector, a servo is quickly connected. Just assign a corresponding channel number to the servo and you are done connecting a servo.
- Three voltage regulators. In summary, four S.Bus outputs are available which are paired (output 1: A1+A2, output 2: B1+B2). Each of both outputs has its own voltage supply which is selectable between 5.4V, 6.0V, 6.6V or 7.4V. Maximum power load is 10A continuously (> 15min / 7.4V) and 50 amps temporarily (per double output) when connecting 2S LiPo batteries.
- Using an optional temperature regulated fan, which is simply screwed onto the base device, the power of the battery switch can be increased to 16A continuously if needed.
- Besides the serial outputs also parallel outputs 1..8 (or 9..16) are available for connecting standard servos or auxiliary electronics with PWM control. These outputs (C) also contain their common voltage supply, which is selectable between 5.4V, 6.0V, 6.6V or 7.4V. Current load is here approx. 8A continuously and can be increased to 12 amps when using the fan.
- Current supply for the receiver(s) is also accomplished via the output (C), herewith the voltage is identical. This also allows for connecting servos directly to the receiver.
- High current capability. Battery connection takes place intentionally via slightly thicker cables. Of course, both batteries are discharged completely symmetrically during operation. This divides the current per battery by two which helps for a longer battery life. With two LiPo chargers 2S 750 milli-amps (Part Nr. F1692) both LiPo batteries can be charged from the 115/230 volts system without disconnecting cabling. The integrated equalizer serves for balanced cell voltages.
- Acoustically alarm Maximized safety is guaranteed by the integrated buzzer. It outputs error information by buzzer codes. If the capacity of the battery decreases to an impending low voltage situation, this will be signaled unambiguously.
- Up to 36 Servos. The transmitter controls a maximum of 16 proportional and 2 switching channels (depending on transmitter). On the side of the battery switch, an unlimited number of servos can be operated in parallel if assigned an identical channel number. For these servos travel, direction, reaction times etc. are adjustable individually.
- Furthermore, parallel and serial channels can be used at the same time. The number of maximum usable servos is only limited by current load and can practically reach up to 36 servos depending on the servo type used.
- Due to the low number of connectors as well as highly effective fan technology for cooling, the battery switch is relatively small with 122 x 80 x 33mm 3 / 4.8" x 3.15" x 1.3" light-weight with its 200 grams / 0.440925 pounds (220 grams / 0.485017 pounds with fan).
- Simple Mounting. The PSS2018 is mounted in the model with four screw connections via vibration dampened rubber buffers. All electrical connections are plugged in order to easily move the battery switch from one model to another.
- SD Memory Card. Furthermore, the PSS2018 has a slot for a SD memory card. Herewith, the software can be updated via a boot loader function. The SD memory card is also used for recording data. The most important flight data (voltages, currents, capacities, errors and so on) can be easily transferred to and read, displayed and evaluated at a PC. Due to the huge memory capacity of the SD card a real model log book can be saved. The data can also be read and displayed in real time on the field using an optional LCD control box.