Athena OTC25, OTC25 N-L-P, OTC25 N User Manual
DIGITAL TEMPERATURE
CONTROLLERS
SERIES
OTC25 N/L/P
Instruction
Manual
Congratulations on your purchase of an Athena Series
OTC25 Digital Temperature Controller. It is designed for
ease of use and reliability wherever accurate temperature
control is required.
After following the instructions for installation, simply step
through and set each of the unit’s parameters using the OTC25’s
easy menu system.
If you still have questions or require any assistance in setting up
or operating your controller, please contact your Athena representative or call 1-800-782-6776.
Features
Safety
Warning
• Type J Input (OTC25 N, OTC25 L)
• Type J or K Input (OTC25 P)
• ±0.3% FS Accuracy
• Large, Easy-to-Read LED Display, Selectable for
Either Setpoint or Process Temperature
• Adjustable Output Hysteresis to Prevent Rapid
Cycling Around Setpoint Temperature (OTC25 N)
• Adjustable Deviation Alarm Flashes Display When Measured
Temperature Exceeds or Falls Below Setpoint Temperature
• NEMA 4X Front Bezel, Splash-Proof and Resistant to Dust
• Discrete Status Indicators Illuminate When Temperature
Display, Setpoint Display or Heat/Cool Output is Active
• Approvals: UR, cUR, CE
In addition to presenting a potential fire hazard, high voltage and
high temperature can damage equipment and cause severe injury
or death. When installing or using this instrument, follow all
instructions carefully and use approved safety controls. Electrical
connections and wiring should be performed only by suitably
trained personnel.
Do not locate this instrument where it is subject to excessive
shock, vibration, dirt, moisture, oil, or other liquids. The safe
operating temperature range for this unit is 32° F to 140° F (0° C
to 60° C).
© Copyright 2004, Athena Controls, Inc.
Introduction
Table of
Contents
Installation 1
Mounting 1
Wiring 2
Operation 2
OTC25 N On/Off Controller 4
OTC25 L Limit Controller 5
OTC25 P PID Controller 7
Calibration 10
Error Codes 11
IEC Requirements 11
Warranty/Repair Information 12
Technical Specifications 14
1
Installation
Pre-Installation Instructions
1. Inspect shipping carton for obvious signs of mishandling.
2. After removing the controller from the shipping carton,
inspect it carefully for damage. Never attempt to install and
use a damaged unit.
3. Verify that the ordering code number indicated on the side of
the controller matches what was ordered.
Figure 1. Case Dimensions
Prior to mounting the OTC25 in your panel, make sure
that the cutout opening is of the right size, 3.622" x 3.622"
(92 mm x 92 mm), and deburred to enable a smooth fit.
A minimum of 5.0" (127.0 mm) of depth behind the panel
is required.
0.25"
(6.35 mm)
3.5"
(88.9 mm)
3.780"
(96 mm)
3.780"
(96 mm)
°F
ACTUAL SETPOINT 02
01
Mounting
Figure 2. Mounting Diagram
Before installing OTC25, ensure gasket seats evenly
around edges of unit and that there are no breaks or tears
in the gasket.
Insert the OTC25 through the front panel cutout, slide
mounting “U” bracket around unit and secure it with the
screws provided.
Gasket should be evenly compressed around all sides to
provide liquid-tight mounting.
0.25"
(6.35 mm)
3.5"
(88.9 mm)
3.780"
(96 mm)
3.780"
(96 mm)
ACTUAL SETPOINT HEAT
MOUNTING
SCREWS
GASKET
PANEL
BRACKET
3.780”
(96mm)
3.780”
(96mm)
0.25”
(6.35mm)
3.5”
(88.9mm)
3.780”
(96mm)
3.780”
(96mm)
0.25”
(6.35mm)
3.5”
(88.9mm)
2
Operation
Athena Series OTC25 Digital
Temperature Controller
Just a few easy steps are required before your OTC25
can be placed into service. After completing the mounting
and wiring procedures as previously instructed, set each
controller parameter using the simple front-panel keys
as instructed.
Power On
When power is first applied to the OTC25, all segments
of the LED display, as well as the discrete indicators, will be
momentarily illuminated while the instrument goes through a
series of diagnostic checks to verify proper operation of the unit.
A software version will then be displayed, e.g., . The last
two digits of this code indicate the software revision supplied
with your controller. Please provide this revision number when
contacting us regarding your unit. This display is followed by a
mnemonic code representing the OTC25 model type.
Wiring
IMPORTANT: All electrical wiring connections should be made
only by trained personnel using Class 1 wiring, and in strict
accordance with the National Electrical Code and local regulations. Both of the incoming power lines should be fused with
2AG, 0.5 A maximum rated fuses.
The OTC25 controller has built-in circuitry to reduce the effects
of electrical noise (RFI) from various sources;
however, power and signal wires should always be kept
separate. We recommend separating wires into one bundle for
power (from line power and output) and one bundle for signal
(from thermocouple).
The OTC25 power supply accepts 100 through 250 Vac and 120
through 250 Vdc line power without any switch settings or
polarity considerations.
Figure 3. Wiring Connections
OUTPUT #2
OUTPUT #1
COM.
N.O.
N.O.
L1
L2
COM.
T/C
(-)
(+)
OTC25 N
Operation
Figure 5a. Series OTC25 N Parameters and Default Settings
Parameter Descriptions
Default Display
This parameter determines whether the OTC25 N’s display shows the
Setpoint or the actual temperature by default. Regardless of the selection
made here, the operator can observe the other value by momentarily
pressing the Parameter Key. This will cause the alternate value to be
displayed for five seconds.
Control Hysteresis
Control Hysteresis is adjustable between 2 and 252° F (1 to 140° C ). This
parameter is used by the control algorithm to prevent rapid cycling of the
output around Setpoint. The default value is 4° F (2° C). This means the
heat will turn OFF when the Actual Temperature exceeds the Setpoint by 2°
F (1° C). Conversely, the heater will not turn ON until the Actual
Temperature drops 2° F (1° C) below the Setpoint.
Display Offset
Display Offset is adjustable from -126 to 126° F (-70 to 70° C). It can be
used to provide limited adjustment of the displayed temperature as a compensation for offsets between the true temperature and the temperature
seen by the thermocouple.
To enter the configuration menu, press and hold the Parameter
key for 10 seconds until the display changes to the parameter
mode. Press the Parameter key again to index through the available parameters. Pressing the Parameter Key for 3 seconds or
allowing 60 seconds of inactivity will cause the OTC25 N to exit the
menu system and return to normal operating mode.
3
Parameter Range Range Display Options Default Default
Default
Display
Control 2 to 1 to
Hysteresis 252 140
Display -126 to -70 to
Offset 126 70
Deviation OFF, 1 OFF, 1
Band Alarm to 252 to 140
Display
Units
Low
Calibration
High
Calibration
°F °C °F °C
Fixed Fixed
Fixed Fixed
OTC25 N
Operation
The Calibration High
and Calibration Low
selections are accessible only when the
calibration jumper is
installed as instructed
on page 10 (Figure 6).
OTC25 N On/Off Temperature Controller
Normal Operation
The factory default display setting of the OTC25 N is for Actual
Temperature . The default display may be changed to
setpoint temperature by selecting Setpoint at the Default
Display parameter selection. When the Default Display is
changed to Setpoint, the setpoint temperature may be adjusted
by using the Raise or Lower keys. The setpoint is
adjustable from 32 to 905° F (0 to 485° C).
When the Default Display setting is “Actual” , adjustment
of the Setpoint may only be accomplished by pressing the
Parameter Key momentarily to switch the display to Setpoint,
and then using the Raise or Lower Keys
to change the Setpoint Value. The display will automatically
revert back to “Actual” five seconds after the last keypress.
Parameter Configuration
Your OTC25 N controller’s parameter selections are explained
on the next page, with default settings shown in Figure 5a.
Parameter Key
Used to access available parameters to set or change values.
Raise Key
Used to scroll up through available parameter settings or to
increase values. (Hold for fast-step progression)
Lower Key
Used to scroll down through available parameter settings or
to decrease values. (Hold for fast-step progression)
Discrete LED Indicators
OTC25 N OTC25 L OTC25 P
Actual: amber Actual: amber Actual: amber
Setpoint: amber Setpoint: amber Setpoint: amber
Heat: orange Limit: orange Output 1: orange
Output 2: orange
Operation
Three-Digit
LED Display
Displays measured
temperature, setpoint,
or parameter labels
and settings.
Figure 4. Front Panel Controls and Indicators
4
°
ACTUAL
SETPOINT
HEAT
5
OTC25 L
Operation
OTC25 L Limit Controller
Normal Operation
The factory default display setting of the OTC25 L is for Actual
Temperature . The default display may be changed to
setpoint temperature by selecting Limit Setpoint at the
Default Display parameter selection.
When the Default Display is changed to Limit Setpoint, the limit
setpoint temperature may be adjusted by using the Raise or
Lower keys. The limit setpoint is adjustable from 32 to 905°
F (0 to 485° C).
When the Default Display setting is “Actual” , adjustment
of the Limit Setpoint may only be accomplished by pressing the
Parameter Key momentarily to switch the display to Limit
Setpoint, and then using the Raise or Lower Keys to
change the Limit Setpoint Value. The display will automatically
revert back to “Actual” five seconds after the last keypress.
Parameter Configuration
Your OTC25 L controller’s parameter selections are explained
on the next page, with default settings shown in Figure 5b.
To enter the configuration menu, press and hold the Parameter
key for 10 seconds until the display changes to the parameter mode. Press the Parameter key again to index through the
available parameters. Pressing the Parameter Key for 3 seconds
or allowing 60 seconds of inactivity will cause the OTC25 L to
exit the menu system and return to normal operating mode.
OTC25 N
Operation
Deviation Band Alarm
A Deviation Band is a pre-set number of degrees, plus and
minus, around the Setpoint Value, ex.
+
10° F. A Deviation
Band Alarm provides an indication to the operator that the Actual
Temperature has either exceeded or dropped below the chosen
deviation. This parameter can be turned off or adjusted
from 1 to 252° F (1 to 140° C). When the process variable is outside the deviation band, the alarm is indicated by flashing the
display (regardless of whether setpoint or actual temperature is
displayed) and the optional alarm output is activated.
Display Units
This allows the operator to have the display indicate either
degrees Fahrenheit or degrees Celsius.
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