Emerson SERIES 600T Manuel D’Utilisation

The speed detection system uses an infrared emitter and a sensor to detect the rotation of the shaft. A 

hole drilled through the shaft allows light to pass and is detected on the opposite side by an infrared 

detector. This signal is used to detect the rotor angle, the speed and any over speed condition. The 

pulsed signal passes into the 6711 DSP to be converted into a speed signal. This is then passed to the 

2812 DSP. The 2812 checks for over-speed and shuts down the power electronics if this occurs. If 

either of the processors lock-up, the rotor will slow down, this guarantees that on over-speed cannot 

occur.

The stator and rotor temperature detectors are thermocouples and are both conditioned in a similar 

way. The stator sensor is a Type J thermocouple potted into the stator windings. The rotor sensor is a 

non-contact type sensor that detects the temperature of the rotor surface and gives an output in a 

Type J thermocouple format.