Somfy RK3 relay box for 3 tubular motors, suitable for central and individual control, mounted in an impact-resistant grey plastic box, control current 230 Volt Read more.
- control box with isolating relay for parallel switching of 3x 230 V motors
- suitable for central and individual control
- mounted in an impact-proof grey plastic box
- control current 230 Volt
- each motor is separately fused
- rated load relay 10 Amps
- protection degree IP54
- dimensions 200x160x92 mm (wxhxd)
- including 10 grommets
A tubular motor must never be connected in parallel, because the motors never have exactly the same running time due to, for example, different types of motors or a difference in height of the roller shutter. The motor that reaches its limit switch first is energised by the still-running motor with an inductive and capacitive voltage on the counter winding. This voltage, which can be up to 1000 volts, sets the initially switched-off motor in motion in the opposite direction, until the motor receives the supply voltage again via the microswitch that has now been closed and the motor starts running in its original direction again. This so-called pendulum motion continues until the limit switches are damaged under the huge load.
