Current limit switches
Current limiters are ment to limit the current through a DC-motor. The limiter can switch off at a pre-determinated current. See below the details of the different types.
| Type | Construction | Nominal/peak current | Voltage |
|---|---|---|---|
| EAG30 (1805kB) | built-on | 1A (fixed/value on request) |
|
| SA12 (181kB) | housing | Max. 30A (adjustable) 12V / 24V | 12V / 24V |
| SA14 (177kB) | housing | Max. 14A (adjustable) 24V | 24V |
| ROBOtronic (1638kB) | housing | 12A | 24V |
| ROBO Tronic type 1 (110kB) | housing | 12A | 24V |
| ROBO Tronic type 2 (147kB) | housing | 12A | 24V |
| ROBO Tronic type 3 (151kB) | housing | 12A | 24V |
| ROBO Tronic type 4 (104kB) | housing | 12A | 24V |
| ROBO Power (121kB) | housing | 12A | 24V |
Current limit switch - SA12/14
12/24V for connection to battery or transformer with bridge circuit (full ripple).The END STOP switch will stop the motor or the actuator automatically when it encounters a stop or load exceeding the value preset on the potentiometer.
SA12 is suitable for operation with powersupplies 12 and 24VDC and batteries up to 12V.
SA14 is suitable for operation with powersupplies and batteries up to 24VDC.
Datasheet SA12 (181kB)
Datasheet SA14 (177kB)
Options
- Can reverse the motor poles
- Adjustable current-stop
- No power consumption in position of rest
- Plugs can be delivered
Function
When the contact FORWARD or RETURN is closed, the motor will run and when the contact is released, the motor will stop.If the motor is blocked or encounters a stop, the current in the motor will increase and the END STOP switch disconnects the motor. The current-stop is adjusted on the trim potentiometer.
Application
The END STOP switch SA12 + SA14 is used for control of DC-actuators and DC-motors in f.i. lifting devices, agricultural machinery and hospital beds.
Current limit switch - ROBO Tronic
The ROBO Tronic is the link between the source of the current supply and the permanent magnetic motor. The ROBO Tronic gets its current from a mains power source or battery.
There are two types ROBO Tronic current limit switches, 1 and 2. The main difference between these types is:
- Type 1: switch off current value van only be roughly set in both directions with potentiometer. Max. current = 10A.
- Type 2: switch off current value can be set individually in borh directions. Max. current = 12A.
Read more about the ROBO Tronic on the overviewpage on
the Bosch website.
- Datasheet ROBO Tronic, type 1 (110kB)
-
Datasheet ROBO Tronic, type 2 (147kB)
- ROBO Tronic brochure (1638kB)
Options
| Type 1 | Type 2 |
|---|---|
| Can reverse the motor poles + on/off function | Can reverse the motor poles + on/off function |
| Electric brake function | Electric brake function |
| No power consumption in position of rest | No power consumption in position of rest |
| Automatic detection 12 / 24 V | Individually adjustable overload limits |
|
|
Output for overload indication |
Function
Type 1
When the contact forward or return is closed, the motor will run and when the contact is released, the motor will brake and stop. If the motor is blocked or encounters a stop, the current in the motor will increase and the end stop switch disconnects the motor. After releasing the run signal and re-applying it, the motor will run again. The current-stop is roughly adjusted on the trim potentiometer for both directions.
Type 2
When the contact forward or return is closed, the motor will run and when the contact is released, the motor will brake and stop. If the motor is blocked or encounters a stop, the current in the motor will increase and the end stop switch disconnects the motor. After releasing the run signal and re-applying it, the motor will run again. The current-stop is adjusted on a multi turn trim potentiometer, separately for each direction.
Application for type 1 and 2
The end stop ROBO Tronic type 1 is used for control of DC-actuators and DC-motors in f.i. lifting devices, agricultural machinery and hospital beds. It allows you to:
- protect your motor
- protect your mechanics
- let it function as an end stop switch
- change motor direction + turn on/off
