18
Sü-2 - Set point 2.
tN2r - Ramp time 2.
tN2S - Dwell time 2.
Sü-3 - Set point 3.
tN3R - Ramp time 3.
tN3S - Dwell time 3.
Sü-4 - Set point 4.
tN4r - Ramp time 4.
tN4S - Dwell time 4.
P-on - Power-on start. Push the “Up” or “Down” Buttons to
set to “Yes” or “No.” When set to “Yes,” your furnace will
immediately begin running the set program when you power
on your furnace. For most applications, set to “No.”
The next three parameters - Proportional band, Integral and
Derivative - are the three control parameters of a P.I.D. con-
trol system. The values for these parameters are set during
the tuning process. You should not change them; doing so
may cause your controller to operate incorrectly.
P - Proportional band
i - Integral
d - Derivative
AL1T - Alarm type. This parameter determines how the
controller responds to any alarm input. It should display
“0031.” If it does not, set it to “0031.”
AL11 - Furnace overtemperature alarm. This parameter
determines the absolute upper limit on the
furnace
chamber temperature. We recommend a setting of
“1000°C” since 1000°C is the
maximum temperature
your furnace can obtain without damage to furnace compo-
nents. You may wish to set the parameter lower if you need
to ensure a crucial process is protected from high
temperature.
AL12 - High deviation alarm. This parameter determines
NOTE
Overtemperature protection
The controller is fitted with a mechanical relay
which is de-energized in the alarm mode. This
relay, when de-energized, removes power from
the heating elements. If the primary control cir-
cuit fails, the OTP will control the furnace tem-
perature at the value you have entered for AL11.
It does not shut off the furnace, but will maintain
the chamber temperature at that value.
O
PERATION
OF
4 R
AMP
& 4 D
WELL
P
ROGRAMMABLE
M
ODELS
