Omega BB703, User Manual, Page: 11 / 20

3-3
In the STANDBY mode, the unit is powered down except for the fan and fan
thermostat. If the unit has been operated at high temperature and is then put
into standby mode, the fan will still run until the target plate has cooled down to
room temperature.
If the unit is operated at high temperatures in elevated ambient temperatures,
an overheat condition may occur. In an overheat situation a mechanical reset
switch on the right side panel will pop and open the heater circuit. The controller
will still have power. While the
controller will be demanding
heat from the heater, the
process temperature will fall
continuously until it equalizes
with the room temperature. If an
overheat condition occurs, let the
unit cool off for one hour (leave
the unit on), then press the reset
button, firmly.
The layout of the front panel
is shown in Figure 3. The BB703 incorporates a PID digital setpoint controller.
In the default mode the digital display indicates the blackbody target plate
temperature known as (PV) Process Variable. Holding down the modify key
causes the display to show the programmed setpoint known as (SV) Setpoint
Variable. Making changes to the setpoint, units of measure and communication
settings are made by pressing the MODIFY key in conjunction with the
INCREASE or DECREASE key. Holding the MODIFY key and INCREASE/
DECREASE key for an extended period will cause the setpoint temperature to
advance more quickly to a desired value. Three scanning speeds are provided:
slow, medium and fast. The minimum and maximum setpoints are locked at 0
and 400°C (32 and 752°F), respectively. While these max. and min. settings are
changeable (see “Changing the Internal Parameters,” Section 3.5), it is strongly
advised not to adjust these parameters.
The BB703 operates at its optimum performance when left with the factory
parameter settings. The only internal parameter that the operator may need to
change is the
BB703 Operation
Menu 1 Menu 2 Menu 3
TUNE OFF SP1.P 0 SP1.d SSd1
BAND A 58 hAnd OFF SP2.d SSd2
int.t A 1.2 PL.1 100 burn uP.SC
der.t A 8 PL.2 100 rEU.d 1r.2d
daC A 2.0 sp2.A none rEU.L 1n.2n
CyC.t A 5 sp2.b none SPAn * 10
oFSt 0.0 diSp 0.1º Zero * -2.5
SP.LK OFF hi.SC 752 ChEK OFF
SP.rr 0 Lo.SC 32 rEAd Uarº
SPrn OFF ipPt rtd tECh Ct A
SOAK - - unit ºF Uer 392
SEt.2 0.0 rSEt nonE
bnd.2 3.6
CyC.2 on.oF
NOTE: An “A” or a “*” next
to parameter means that
this parameter is custom
calibrated for each unit at the
factory. The values for these
parameters in the figure are
arbitrarily chosen.
OVERHEAT
RESET SWITCH
HANDLE
(IN RETRACT POSITION)
FRONT
BACK
FAN
Figure 6. Menu Hierarchy
Showing Factory Default Settings
Figure 5. Overheat Reset Switch
3