Heraeus Baureihe 6000 Betriebsanleitung Seite 51

Temperature limit
controller
for excess
temperature
Thermal safety class 3.1
Protection of the heating oven, its enviroment and
the load against inadmissible excess temperature.
Admissible only for non-dangerous loads.
Function:
The temperature limit controller is operationally and
electrically independent of the temperature control system.
In case of failure, it takes over the control function.
Temperature limit controller
When the control knob is set to the limit stop, the
temperature limit controller functions as oven protection. If
the temperature limit controller is set to a value somewhat
higher than that selected on the controller, it functions as
load protection. Once the temperature limit controller
begins to function and the red warning light comes on,
proceed as follows:
1 .Disconnect the oven from the line.
2.Investigate and eliminate the cause of the failure.
3.Tum the oven on again as described.
Setting:
To ascertain the temperature at which the temperature limit
controller operates, and thus to be able to adjust it properly,
the oven must be put into operation. Set the control knob
to the limit stop (protection of the oven). After the selected
operating temperature has been reached, reset the
temperature limit controller to the switch point. If the
controller comes into operation, the red warning lamp lights
up.
The optimum setting of the temperature limit controller is
found by turning back the control knob by approximately
one graduation mark. The red warning lamp goes out.
Operational test:
The temperature limit controller should, at reasonable
intervals, be tested for proper operation. It is recommended
that this test be carried out routinely by the authorized
operating personnel, e.g. prior to the start of a longer work
process.
WPPAP1/ID368
50012336 - 1 7 -