CLS200 Series User’s Guide
Chapter 1: System Overview
18
CLS200 Cabling
Watlow offers optional cables to support installing your CLS200. A 50-pin SCSI cable connects the
TB50 to the CLS200.
The optional cable used to connect the CLS200 to a computer using EIA/TIA-232 communications
has a DB9 connector for the computer and bare wires for connecting to the CLS200.
Safety
Watlow has made every effort to ensure the reliability and safety of this product. In addition, we have
provided recommendations that will allow you to safely install and maintain this controller.
External Safety Devices
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
alarms, see
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
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.
WARNING!
The controller may fail in a 0% or 100% power output state. To prevent
death, personal injury, equipment damage or property damage, install external safety
shutdown devices. If death or injury may occur, you must install approved safety
shutdown devices that operate independently from the process control equipment.
With proper approval and installation, thermal fuses may be used in some processes.
Power-Fail Protection
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
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.
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