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Summary of Contents for Chromalox 3901
- Page 1 3901 ® Chromalox Overtemperature Controller ® APPROVED User’s Manual Issue Date 0037-75121 Dec 1993...
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Page 2: Table Of Contents
Table of Contents Sections Section Topic Page Introduction to the 3901 Controller Installation Operation Calibration Specifications Warranty and Return Information Illustrations Figure Topic Page Overtemperature Control Application Model Identification Table Removing the Back Cover Mounting Dimensions Mounting Diagram Wiring Connections... -
Page 3: Sections
Section 1 Introduction to the 3901 Controller The Chromalox 3901 Overtemperature Controller gives you reliable and economical digital indicating, overtemperature control in a compact 1/4 DIN package. Figure 1.1 illustrates a typical overtem- perature application. Figure1.1 Overtemperature Control Application 3901... -
Page 4: Model Identification Table
120 Vac, +10%, -15%, 50/60 Hz 230 Vac, +10%, -15%, 50/60 Hz Code Input Type/Indication Range Type J Thermocouple, 0-999 F Type J Thermocouple, 0-500 C Type K Thermocouple, 0-1999 F Type K Thermocouple, 0-1100 C 3901- Typical Model Number Chromalox 3901 User’s Manual... -
Page 5: Installation
Step 1 - Accessing Internal Adjustments Step 2 - Mounting Step 3 - Wiring Step 1 The back cover of the 3901 can be easily removed to Accessing access the following internal adjustment: Internal • Set Point Limit Potentiometer (page 11) -
Page 6: Removing The
30 F to 130 F (0 C to 55 C). Figure 2.2 gives the mounting dimensions for the controller. Figure 2.2 (96) (19) (61) (92) Mounting Dimensions READ ALARM (96) (89) TEMP Chromalox PANEL CUTOUT Measurements are shown in inches. Millimeters are shown in parenthesis. Chromalox 3901 User’s Manual... -
Page 7: Mounting Diagram
4. For other mounting configurations, the mounting bracket tabs may be placed in the controller casing vent slots. Figure 2.3 Mounting Diagram Mounting Hole Mounting Tab Loosen Screw Chromalox 3901 User’s Manual... - Page 8 Important To insure that the 3901 controller performs Wiring optimally, it is imperative that you read this section Information and become familiar with “Good Wiring Practices” critical to eliminating electrical noise. Failure to follow good wiring practices can result in poor temperature measurement and ineffective high limit control.
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Page 9: Wiring Connections
The model number identifies the instrument power of your controller. Instrument Power 3901 - **1** 120 Vac 3901 - **2** 230 Vac Make the instrument power connections for your controller type (120 Vac or 230 Vac) as shown in Figure 2.4. Chromalox 3901 User’s Manual... - Page 10 Figure 2.4, using the recommended snubber circuit as discussed on page 6. Remote Alarm Reset Connection Terminals 3 and 4 are provided for connection of a remote, normally-open reset switch. Make the reset switch connection as shown in Figure 2.4. Chromalox 3901 User’s Manual...
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Page 11: Operation
Alarm Reset Remote Alarm Reset Set Point Limit Initial When power is applied to the 3901, it will begin Power-Up operating using the factory-set alarm set point shown in the digital display. The process temperature measured by the thermocouple can be selected for display by pushing the “READ TEMP”... -
Page 12: Front Panel Identification
To reset the latching alarm relay, press the RESET Reset switch located behind the front door flap. If you attempt to reset the alarm before the process temperature has reached a normal state (below set point), the RESET pushbutton will be ineffective. Chromalox 3901 User’s Manual... - Page 13 100% to 20% of sensor span. To adjust the set point limit, remove the back cover of the 3901 as described on page 4. Locate the set point limit potentiometer shown in Figure 3.2.
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Page 14: Set Point Limit Potentiometer
3. After reaching the desired set point limit setting, be sure to readjust the process set point to the application’s setting using the SET PT knob. To verify the set point limit setting, attempt to adjust the set point past the set point limit. Chromalox 3901 User’s Manual... -
Page 15: Calibration
Section 4 Calibration The 3901 controller has been calibrated and tested at the factory prior to shipment. Calibration on receipt is not necessary. Equipment A precision thermocouple simulator and a small Required instrument screwdriver are necessary to calibrate the controller. - Page 16 (900 F or 1600 F). 4. Repeat steps 2 and 3 as many times as necessary until both displays equal their respective sensor input values. 5. Calibration complete. Chromalox 3901 User’s Manual...
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Page 17: Specifications
K thermocouple input Upscale burnout, alarm indication, contacts open Accuracy of +/- 0.5% of span over mid-80% of scale Indication Resolution 1 F or 1 C Repeatability 1 F or 1 C Alarm Output Red “ALARM” LED Chromalox 3901 User’s Manual... - Page 18 Variation Noise Rejection Common Less than 2 F with 230 Vac, 60 Hz applied from Mode sensor input to instrument case Series Mode Less than 2 F with 100 mV, peak to peak series mode noise Chromalox 3901 User’s Manual...
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Page 19: Warranty And Return Information
No other express warranty, written or oral, applies with the exception of a written statement from an officer of Chromalox Instruments and Controls, Wiegand Industrial Division, Emerson Electric Co. Warranty This warranty extends for twelve months from the date... - Page 20 ® Chromalox INSTRUMENTS AND CONTROLS 1382 HEIL QUAKER BOULEVARD LAVERGNE, TN 37086-3536 PHONE (615) 793-3900 FAX (615) 793-3563 WIEGAND INDUSTRIAL DIVISION EMERSON ELECTRIC CO. ®...
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