ABB SC520M 3BSE016237R1 controller

ABB SC520M 3BSE016237R1 controller

Technical data of product parameters

The CLS200 controller may fail full-on (100% output power) or full-off (0% output power), or may
remain full-on if an undetected sensor failure occurs. For more information about failed sensor SC520M 3BSE016237R1
alarms, see Failed Sensor Alarms on page 59.
Design your system to be safe even if the controller sends a 0% or 100% output power signal at any
time. Install independent, external safety devices that will shut down the system if a failure occurs.
Typically, a shutdown device consists of an agency approved high/low process limit controller
that operates a shutdown device such as a mechanical contactor. The limit controller monitors
for a hazardous condition such as an undertemperature or over-temperature fault. If a hazardous SC520M 3BSE016237R1
condition is detected, the limit controller sends a signal to open the contactor.
The safety shutdown device (limit controller and contactor) must be independent from the process
control equipment.In the occurrence of a sudden loss of power, this controller can be programmed to reset the control
outputs to off (this is the default). Typically, when power is re-started, the controller restarts to data
stored in memory. If you have programmed the controller to restart with control outputs on, the SC520M 3BSE016237R1
memory-based restart might create an unsafe process condition for some installations. Therefore,
you should only set the restart with outputs on if you are certain your system will safely restart. (See
Process Power Digital Input on page 71.)
When using a computer or host device, you can program the software to automatically reload
desired operating constants or process values on power-up. Keep in mind that these convenience
features do not eliminate the need for independent safety devices.
Contact Watlow if you have any questions about system safety or system operation.

Product picture display

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