Carbolite 301 - Manual (Page 20)

Overtemperature Protection
20 MC16-GB-C – 1.04
9.5 Overtemperature Activation
When an overtemperature circuit is fitted and is operating, the overtemperature indicator is
green. When the temperature of the furnace or oven goes above the overtemperature limit,
the overtemperature circuit activates. The power supply to the heating elements is cut and
the overtemperature indicator changes to flashing red.
Pressing the Overtemperature key shows
Ott in the display to say that the
overtemperature has been triggered.
The reason for the overtemperature activation should then be investigated; an incorrect
setting in the overtemperature limit is often the cause. When you are satisfied with the
reason for the overtemperature activation it can be reset.
9.6 Resetting Overtemperature Activation
Starting at the Home display press and hold the Overtemperature key;
Ott is displayed.
Press the Page key;
Ot is displayed and the red indicator stops flashing.
Press the Up or Down arrow key to check the overtemperature limit value.
Press the Up or Down arrow key to alter the value if necessary.
Press the Page key to return to the overtemperature home display.
The overtemperature has now been reset
When the temperature falls below the overtemperature limit, the indicator changes back to
green.
When the PV falls below the temperature setpoint, the furnace/oven starts to heat again.
10 RS232 Communication
The 301 controller can be supplied with the capability to communicate with other devices via
an RS232 link. If this option has been ordered, the furnace or oven will be supplied with a 9
pin ‘D’ socket for connecting to an external device. Plugging this into a computer will allow
the controller to be accessed from that computer. The computer must have appropriate
co
mmunication software installed such as Eurotherm’s ‘i-Tools’
10.1 RS232 Communication Addressing:
Modbus Address (Main) = 2
Modbus Address (O/Temp)= 3
Baud Rate = 9600
Byte Format = 8
Hold
Ot