SPS SafetyPowerSwitch

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Product description

A72011 10.jpg

The SPS SafetyPowerSwitch is a electronic safety switch for electric drives. An anti-flash-circuitry prevents the sparks during connecting the battery. The SPS SafetyPowerSwitch separates the motor from the battery. The electric motor drive remains inactive and therefore non hazardous until activation.

Key features

Switching on and off of electrical motors

The SPS SafetyPowerSwitch serves for switching on and off of electic drives. When using the SPS SafetyPowerSwitch it is ensured that electic drives do not start accidentally and cause insuries e. g. during preparation of the model. The drive is supplied with voltage only when switch is operated consciously.

Anti flash protection

Furthermore the SPS SafetyPowerSwitch prevents the flash occuring when connecting the battery.

Hint: The flash protection function of the SPS SafetyPowerSwitch is not in context with pre-charging the motor controller's capacitor. Some manufacturers require the pre-charging of this capacitor. In that case see section #Using a power resistor for pre-charging capacitors.

Recent versions

The versions of the SPS SafetyPowerSwitch in the standard design differ from the maximum input voltage (34V or 70V) and from the permissible permanent and peak current.

  • SPS SafetyPowerSwitch 34V 60/120A
  • SPS SafetyPowerSwitch for Multicopter systems 34V 100/200A
  • SPS SafetyPowerSwitch 70V 60/120A
  • SPS SafetyPowerSwitch 70V 100/200A
  • SPS SafetyPowerSwitch 70V 140/280A

Furthermore there is a SPS SafetyPowerSwitch in a larger design.

  • SPS XL SafetyPowerSwitch 180/360A

New white label

In the year 2016 the native housing labels of the SPS SafetyPowerSwitches will be replaced with the new white labels.

Native silver label

The SPS SafetyPowerSwitches with the native white labels will be sold out gradually. In future only the new white labels will be available.

SPS SafetyPowerSwitch XL

Former versions

Here listed not longer available 60 volt versions of the SPS SafetyPowerSwitch were replaced by the 70 volt versions listed above.

  • SPS SafetyPowerSwitch 60V 60/120A
  • SPS SafetyPowerSwitch 60V 120/240A

Delivery contents

SPS SafetyPowerSwitch, desired switch actuator, screws, operating instruction

Mounting

The SPS SafetyPowerSwitch is looped in between the drive battery and the motor controller. Therefor e. g. 4mm gold plated plugs or sockets must be applied on the input side. The red cable of the SPS is the positive pole, the black one the negative pole. Obeying polarity is mandatory. The output of the SPS SafetyPowerSwitch must be connected to the motor controller according to polarity. The total cable length between motor controller and battery (incl. SPS SafetyPowerSwitch) should be as short as possible. The SPS SafetyPowerSwitch's PCB can be fixed with Velcro tape to an appropriate surface. Alternatively the fixing with a small screw is possible. For using this method there is a small drilling hole at the end of the PCB. Please observe not to shorten the small solderpads beside the hole with the used srew.

Switching on and off

The SPS SafetyPowerSwitch can be switched on and off by using the connected switch actuator. After switching on the SPS SafetyPowerSwitch the status LED of the switch actuator starts shining.

The SPS SafetyPowerSwitch can only be switched on and off by an external switch actuator. Switching on and off of the SPS SafetyPowerSwitch at the housing itself is not possible. One of three available SPS switch actuators is contained within delivery contents.

Hint: When switching on and off the SPS SafetyPowerSwitch the negative pole is switched.

SPS switch actuators

For the SPS SafetyPowerSwitch three SPS switch actuators are available:

  • SPS Gas cap switch actuator
  • SPS Pin switch actuator
  • SPS Remote switch acutator

All SPS switch actuators must be connected on the SPS switch actuator connector at the "IN" side of the SPS SafetyPowerSwitch.

SPS Gas cap switch actuator

SPS gas cap switch actuator

Switching on and off with the SPS Gas cap switch actuator happens with an external magnet which is plugged inside the SPS Gas cap switch actuator's funnel-shaped opening in idle-mode (SPS SafetyPowerSwitch switched off). When magnet pulled out of the opening the SPS SafetyPowerSwitch is switched on. A green LED inside the SPS Gas cap switch actuator's opening indicates the activated system. For deactivating the SPS SafetyPowerSwitch and the complete system the external magnet must be plugged into the opening of the SPS Gas cap switch actuator again.

SPS Pin switch actuator

SPS Pin switch actuator

Switching on and off with the SPS Pin switch actuator happens with an external pin which is plugged inside the SPS Pin switch actuator's opening in idle-mode (SPS SafetyPowerSwitch switched off). When pin is pulled out of the opening the SPS SafetyPowerSwitch is switched on. A green LED inside the SPS Pin switch actuator's opening indicates the activated system. For deactivating the SPS SafetyPowerSwitch and the complete system the external pin must be plugged into the opening of the SPS Pin switch actuator again.

SPS Remote switch actuator

SPS Remote switch actuator

Main article: SPS Remote switch actuator

Switching on and off with the SPS Remote switch actuator happens with an defined receiver channel. Therefor the desired switching points on the transmitter must be programmed. Optionally the SPS Remote switch actuator can be operated additionally with the SPS Pin switch actuator or the SPS Gas cap switch actuator. See details of programming and important hints inside Main article.

Specifications

SPS SafetyPowerSwitch 34V 60/120A 34V 60/120A (for Multicopters) 70V 60/120A 70V 100/200A 70V 140/280A 60V 60/120A 60V 120/240A XL 180/360A
Suitable batteries (LiPo) 2S ... 8S 2S ... 8S 6S ... 16S 6S ... 16S 6S ... 16S 6S ... 14S 6S ... 14S 3S ... 16S
Voltage range 6V ... 34V 6V ... 34V 18V ... 70V 18V ... 70V 18V ... 70V 18V ... 60V 18V ... 60V 12V ... 70V
Current consumption (switched off) max. 0.5mA, typ. 0.25mA Information coming soon max. 0.5mA, typ. 0.25mA max. 0.5mA, typ. 0.25mA max. 0.5mA, typ. 0.25mA --- --- ---
Permanent current* 60A 100A 60A 100A 140A 60A 120A 180A
Maximum peak current** 120A 200A 120A 200A 280A 120A 240A 360A
Power dissipation @ 50A approx. 5W Information coming soon approx. 2.25W approx. 7.3W approx. 9.6W --- --- ---
Dimensions 65 x 30 x 9.3mm 65 x 30 x 9.3mm 65 x 30 x 9.3mm 65 x 30 x 16mm 65 x 30 x 20mm 65 x 30 x 9.3mm 65 x 30 x 16mm 82.4 x 62.4 x 26.5mm
Weight 45g 45g 45g 71g 105g 45g 71g 195g
The listed 60 volt versions of the SPS SafetyPowerSwitch are not longer available.
Hint: The mentioned *permanent current is calculated for the duration of a common flight, approx. up to 15 minutes. The **peak current is only permissible for a short period of up to three seconds.

Optional extensions

Usage of SPS Support capacitor

SPS Support capacitor

During switching-on process motor controllers may need more current than during regular operation. In this case a short period high current flow could cause a voltage drop at the motor controller and lead to malfunctions. Such voltage drop can also be caused by high-resistance long cables between the drive battery and the motor controller. This voltage drops at the motor controller can be prevented by soldering a capacitor between SPS SafetyPowerSwitch and motor controller. The SPS Support capacitor provides the current peaks required by the motor controller and unloads the drive battery by decreasing the current flow from the drive battery. So the voltage drop at the motor controller is reduced. The total cable length which is recommended without a capacitor can be seen inside your motor controller's operating manual

Specifications SPS Support capacitor

Entity Value
Max. voltage 63V
Capacity 2200µF

SPS Support capacitor

Using a power resistor for pre-charging capacitors

Power resistor 470R

Motor controllers have capacitors which provide short current peaks required during the switchin-on process. This capacitors are being charged when the motor controller is switched on, so depending on the capacitor's input capacity a increased current flow may occur. If the total capacity of all capacitors increases 1500µF occuring currents may damage the SPS SafetyPowerSwitch. This can be prevented when capacitors are pre-charged with a lower current before the SPS SafetyPowerSwitch is switched on. Therefor the minus pole can be bypassed with an external power resistor. The power resistor can be soldered directly between minus pole input and minus pole output. If desired it can be switched with a pushbutton.

Power resistor without pushbutton

Drawing 1

The power resistor can be soldered directly between minus pole input and minus pole output. The motor controller's capacitors will be charged when the battery is plugged. When capacitors are fully charged the SPS SafetyPowerSwitch's LEDs as well as the LEDs of the connected SPS switch actuator are illuminated. This happens a few seconds after plugging the battery. The SPS SafetyPowerSwitch can now be safely switched on because the motor controller's capacitors are pre-charged, no high current flows can occur.

Hint: The SPS SafetyPowerSwitch's LEDs as well as the LEDs of the SPS switch actuator react in a different manner when the minus pole bridge is implemented. After a few seconds after battery is connected the LEDs of the SPS SafetyPowerSwitch and the LEDs of a connected SPS switch actuator (SPS Gas cap switch actuator or SPS Pin switch actuator) are illuminated although the SPS SafetyPowerSwitch is switched off. The drive is still not provided with current and safe! Only when SPS SafetyPowerSwitch is switched on with the switch actuator the voltage is interconnected and the drive has power.

Power resistor with pushbutton

Drawing 2

The power resistor can be soldered directly between minus pole input and minus pole output. A pushbutton can be implemented to make the bridge switchabel. The motor controller's capacitors will be charged when the battery is plugged and the pushbutten is pushed for a few seconds. When capacitors are fully charged the SPS SafetyPowerSwitch's LEDs as well as the LEDs of the connected SPS switch actuator are illuminated. The SPS SafetyPowerSwitch can now be safely switched on because the motor controller's capacitors are pre-charged, no high current flows can occur.

Hint: The SPS SafetyPowerSwitch's LEDs as well as the LEDs of the SPS switch actuator react in a different manner when the minus pole bridge is implemented. After pushing the pushbutton for a few seconds the LEDs of the SPS SafetyPowerSwitch and the LEDs of a connected SPS switch actuator (SPS Gas cap switch actuator or SPS Pin switch actuator) are illuminated although the SPS SafetyPowerSwitch is switched off. The drive is still not provided with current and safe! Only when SPS SafetyPowerSwitch is switched on with the switch actuator the voltage is interconnected and the drive has power.

Constraints

CAUTION: There must not be an electrical connection between the drive battery's minus pole and the receiver respectively the receiver current supply! When using some telemetry sensors this ground connection is made by the sensor respectively by its electronic. So the receiver can be damaged. When using such products the usage of the SPS SafetyPowerSwitch is not possible.

The SPS SafetyPowerSwitch cannot be used in combination with the following Graupner/SJ products:

  • Electric Air Module2-14S, Vario HoTT
  • General Engine-Module 2-6S Gr. HoTT
  • General Air-Module 2-6S, Vario Gr. HoTT
  • Voltage Module 2-4S, EH
  • Voltage Module 2-4S, XH

Proved motor controller

So far the following motor controllers were tested with the SPS SafetyPowerSwitch:

  • KONTRONIK JIVE