10
11
Functions
SENSOR SAMPLING
A “J” or “K” (OPTIONAL) thermocouple is sampled using a 16-bit dual-slope
integrating A/D converter. Input voltages corresponding to temperatures from
32 to 999 °F (0 to 537 °C) are processed with a resolution of 1 °F (°C).
CLOSED-LOOP CONTROL
A PID control algorithm is used to adjust the amount of power delivered to
the load. The Proportional Band and Derivative (rate) parameters are individu-
ally and directly adjustable. The Integral (reset) parameter tracks the
Derivative parameter by a fixed ratio.
OPEN-LOOP CONTROL
In open-loop (MANUAL CONTROL MODE), the operator is able to set the
output percentage.
COMPUSTEP
®
(HEATER BAKE-OUT)
Graduated phase-angle activation of the triac is provided for drying heaters
on startup.
OUTPUT FAILURE OVERRIDE (OPTIONAL)
An optional relay on the RMB is used by the microcontroller to interrupt
current to the load in the event of triac shorting or error condition.
LOOP-BREAK PROTECTION
Software will monitor the response of the system to changes in the output
for the purpose of detecting a control loop break. When this error occurs the
display will read “LPbr”.
TEMPERATURE INDICATION
Actual process temperature is indicated on the Process Display (upper
display). Units (°F or °C) for this display are determined by a jumper (see
page 6) and displayed on the lower display after the setpoint temperature.
HEAT ON INDICATION
A single orange LED is lit whenever the output is on. For additional output
state information, the operator may select to monitor Heater Output
Percentage from the front panel’s lower display. See page 8.
CURRENT MONITORING
The RMB is capable of monitoring and displaying the average current being
delivered to the load. The display is in 0.1 ampere increments.
Modes of
Operation
Manual Mode
To switch to Manual Mode from Auto Mode, press the MODE key until the
“Manual” LED illuminates. This mode allows the operator to adjust the
Manual Output Percentage (0 to 100%) by pressing the UP/DOWN arrow
keys.
There are two different parameters that can be viewed on the lower display
while in MANUAL mode. Pressing the DISPLAY key will toggle between
them.
1) Manual Control Output Percent (modifiable by user) (display followed
by “P”)
2) Measured Heater Current (display followed by “A”)
Auto Mode
To switch to Auto Mode from Manual Mode, press the MODE key until the
“Manual” LED turns off. This mode allows the operator to adjust the setpoint
temperature value by pressing the UP/DOWN arrow keys.
There are three different parameters that can be viewed on the lower display
while in Auto Mode. Pressing the DISPLAY key will toggle between them.
1) Setpoint value (modifiable by user)
2) Output Percent (display followed by “P”)
3) Measured Heater Current (display followed by “A”)
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