Ridder Contactor Boxes

The RMC400 has an inverter as standard for switching the main current. It has an inverting delay of 3 seconds to prevent continued running in the same direction of rotation and to prevent unnecessarily overloading the drive. For a 3-phase mains, the RMC400 continuously checks the phase order of the supply voltage. If a change of phase is detected, the RMC400 internally corrects the phase order so that the drive’s original and expected direction of rotation remains unchanged. The RMC400 also detects a phase failure. During a phase failure, activation is interrupted to prevent the electric motor from overheating.

The RMC400 is connected to the motor gearbox’s limit-switch system. Activation is stopped when an end position is reached. If a safety switch is unintentionally operated when an end position is switched, both automatic and manual activation in the opposite direction of rotation is possible under the correct conditions

External activation of the RMC400 is possible with a 24 V AC/DC control signal or (optional) external manual controls. The RMC400 monitors the control input. The motor gearbox is not activated if there is simultaneous activation in two directions of rotation.

The RMC400 has signal LEDs for displaying the operating status and any faults. Normal operation, activation of the safety switch, thermal overloading and phase failure are displayed via an LED signal. In the event of a fault, the LED signal remains active, even after the fault has been rectified. The signal can be reset using the manual controls. The RMC400 also includes a fault contact (NC) for external notification of a fault situation.