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Controller tests, Supply voltage tests, Temperature tests – Rockwell Automation 1753-L28BBB-M_P GuardPLC 1600 Controllers User Manual

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Rockwell Automation Publication 1753-IN001C-EN-P - June 2010

Controller Tests

In addition to the tests for safety, the controller tests the supply voltage and controller
temperature.

Supply Voltage Tests

The supply voltage (24V DC) is monitored and the alarm and system shutdown are controlled
according to the voltage levels listed below.

Temperature Tests

The temperature of the controller is automatically and continuously monitored. The alarm is
triggered by the temperature conditions described in this table.

Voltage Level

System Condition

19.3…28.8V Normal

< 19.3V

Alarm state 1 (internal variables are written)

< 15.4V

Alarm state 2 (prepares for shutdown)

< 13.0V

Switched off

Operating Temperature

Alarm

< 60 °C (140 °F)

None (normal)

60…70 °C (140…158 °F)

Warning on

> 70 °C (158 °F)

Main alarm on

Return to 64…54 °C (147.2…129.2 °F)

Main alarm off, warning on

Return to < 54 °C (129.2 °F)

None (return to normal)