What is SPS-SCD

Mechanical drive technology

The SCD safety controller is overload protection that increases the product safety of the entire drive train.

The SCD safety control receives the impulses from the sensor and converts them into a voltage proportional to the pulse sequence. This voltage is compared with an adjustable reference value (SET POINT) and is used to monitor the speed of the shaft.

If the preset comparison value is exceeded or not reached, a relay is triggered and a signal is also generated for the operator if the speed is lower.

Working principle

As the transmitted torque increases, this leads to increased slippage of the fluid coupling. The resulting reduction in speed on the output side can be detected with the SCD safety controller and an overload can be detected. The safety control SCD is equipped on the output side with a relay with changeover contact, which can trigger an alarm signal or switch off the motor. A delay circuit (maximum 120 s) prevents the relay from being triggered incorrectly when the motor is started when the operating voltage is switched on. False alarms due to short torque fluctuations are suppressed by a dead time of the control of up to 30 seconds.

Power supply: Standard 24 V AC (on request 115 V AC, 230 V AC or 24 V DC)