S
Accept the new proportional band setting
9.10
Cutout
As a protection against software or hardware fault, shorted heater triac, or user
error, the bath is equipped with an adjustable heater cutout device that shuts off
power to the heater if the bath temperature exceeds a set value. This protects
the heater and bath materials from excessive temperatures and, most impor-
tantly, protects the bath fluids from being heated beyond the safe operating
temperature preventing hazardous vaporization, breakdown, or ignition of the
liquid. The cutout temperature is programmable by the operator from the front
panel of the controller. It must always be set below the upper temperature limit
of the fluid and no more than 10 degrees above the upper temperature limit of
the bath.
If the cutout is activated because of excessive bath temperature then power to
the heater is shut off allowing the bath to cool. The display will flash
“
Cut-out
” and the message will be sent over the communications ports. The
bath cools until it reaches a few degrees below the cutout set-point temperature.
At this point the action of the cutout is determined by the setting of the cutout
mode parameter. The cutout has two modes—automatic reset or manual reset.
If the mode is set to automatic, then the cutout automatically resets itself when
the bath temperature falls below the reset temperature. If the mode is set to
manual, then the heater remains disabled until the user manually resets the
cutout.
The cutout set-point may be accessed within the secondary menu. Press “SET”
and “EXIT” to enter the secondary menu and show the heater power. Then
press “SET” twice to access the cutout set-point.
S+E
Access heater power in secondary menu
12 Pct
Heater power in percent
S
Access proportional band
Pb=0.101C
Proportional band setting
Access cutout set-point
CO= 210C
Cutout set-point
To change the cutout set-point press “UP” or “DOWN”.
49
9 Controller Operation
Cutout
