Motor safety relay checks its own wellbeing
A
Castell Safety International product story
Edited by the Engineeringtalk editorial team
Jan 23, 2003
A novel motor safety relay is capable of monitoring practically all electrical motor applications.
Castell has developed a novel motor safety relay capable of monitoring practically all electrical motor applications.
The DIN-rail-mountable CMM200 monitors the back EMF generated by a motor to detect whether it is safely at rest or in motion.
It is the only back-EMF device to be controlled by dual microprocessors which continually check both the state of the motor and the condition of the relay itself.
The unit comprises two independent channels to which are connected separate windings of the motor being monitored for zero speed.
Only when both channels have detected zero speed will the normally open, forcibly guided safety output terminals become closed.
The CMM200 features local indication of status, zero speed, channel one zero speed and channel two zero speed.
The microprocessors communicate with each other via an optically isolated link and will revert to a failsafe condition should any faults occur.
The microprocessors also monitor the condition of the sensing cables connected to the motor.
If one becomes disconnected, the CMM200 will again revert to a failsafe condition and provide local indication of any fault detected.
Each monitoring channel is galvanically isolated for protection against voltage transients of as much as 4kV.
A high-resistance network allows the CMM200 to monitor motors of up to 690V (AC or DC).
The relay can be used with 24V DC, 115V AC and 230V AC power supplies.
Future models will incorporate an RS485 bidirectional communication port to make them compatible with fieldbus systems, and a local operator interface in the form of an LCD display to provide information on run-down times and fault reports.
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