BLUE M
Model ESP400 Industrial Oven
Page 27
An Eagle Signal Model B856 Digital Process Timer may be provided to time your process cycle and to stop
conditioning when the cycle is complete. The Model B856 is a programmable 1/16 DIN type timer that
features five selectable standard timing operations, with five selectable time ranges. The unit is preset to
operate with an Off-Delay sequence. Preset times ranging from .01 seconds to 9999 hours can be set by the
operator. The four digit preset time display is set up with a 1 thru 4 button-per-digit keypad. A dual line LCD
display shows the preset time, and the elapsed or remaining cycle time. Display indicators provide
information such as the time range and the status of the input and outputs.
Process Cycle Operation:
The Process Timer will begin timing when the Start pushbutton on the main
control panel is pressed. Normally closed timer contacts are wired in series with the Heater Contactor, which
provides power to the circulation blower and enables the heater. Power to the heater is controlled by the
main temperature controller. When the programmed time has elapsed, timer contacts will open to shut down
both the blower and the heater. An audible alarm will sound and the Time Out light on the main control panel
will illuminate. You must press the Reset pushbutton on the main control panel to reset the timer and begin a
new process cycle. The audible alarm will then turn off.
Time Setup:
This procedure explains how to set the process time using the factory set Hours / Minutes configuration.
Since the timer is preset with an Off-Delay sequence, you do not need to make any changes with the Edit (E)
or Program (P) keys.
The top display is the actual process or timed value. The bottom display is the set time that you enter in. The
four keys labeled 1 thru 4 below the display are used to enter in the set time value. Each key can only
change the corresponding Set Time digit 1 thru 4 from
right to left
(increment only), e.g.,
Key 1 changes the first place digit
Key 2 changes the second place digit
Key 3 changes the third place digit
Key 4 changes the fourth place digit
The process / timed value in the top display is normally
factory set (example only) for a ‘Count - Up’ value. From the
photo at the right, the preset time in the lower display is set
for 3 Hrs. 0 Min. When the preset process temperature is
reached upon heat-up, the timer will start counting up from 0 to 3
Hours in the top display.
11.0 PROCESS TIMER – EAGLE SIGNAL B856 (Optional)
Process or Timed Value
Set Time Entered by
Keys 1 thru 4
Edit Key
Program Key
Example Only
Controller
Configuration:
The pre-programmed
controller configuration
for your chamber is
documented in the Test
Report, which is
located in the
Supplemental
Instructions Section.
Refer to the controller’s
user manual for more
information.
