Summary of Contents for M.C. MILLER JR-2
- Page 1 MAN090 Model JR-2 Current Interrupter Operating Manual (Revised August 19, 2011) Catalog # 12830...
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Page 2: Table Of Contents
MCM JR-2 Current Interrupter Table of Contents Topic Page Warranty General Capabilities Features Specifications Panel Controls Operations Overview Installation of the Interrupter in the Rectifier AC/DC Current Carrying Limits Example 1: Delayed Start – Interruption Begins Later Example 2: Intermediate Start –... -
Page 3: Warranty
Operating Manual the unit will perform to applicable specifications for a period of one year after shipment. If examination by M.C. Miller Co., Inc. discloses that the product is defective, then its obligation is limited to the repair or replacement of the defective unit or its components at the option of M.C. -
Page 4: General
Start Condition - Switch is Closed now and re-defined To include STOP SET or Night Latch; Self Diagnostic - Automatically performs a system test at start up and displays Pass if the JR-2 is ready to proceed; An examination of the programmed parameters may... - Page 5 Memory – The last entry made for each function is Remembered by the JR-2 . There is no need to re-program for each start up; Synchronization - Multiple units may be synchronized before or during operation;...
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Page 6: Specifications
MCM JR-2 Current Interrupter Specifications DISPLAY: 5-1/2-digit liquid crystal with battery and relay condition annunciators. Character height: .5 in. Operating temperature: -20 to +195 degrees F. (-30 to +90 C degrees.) TIME BASE: 2 MHz Temperature Compensated Crystal Oscillator, 0.5 Sec. per 24 Hr. - Page 7 NOTE: The JR-2 needs to be put in an Upright Position in order for the unit to Work. The Mercury Relay will not work if it is lying on its side. Once the JR-2 is programmed to the proper setting you wish to set, at that time you may set the JR in an Upright Position and press start set so it may operate correctly.
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Page 8: Panel Controls
MCM JR-2 Current Interrupter Panel Controls A. Battery Charging Indicator Light; B. Power Switch; C. Relay Starting Position Switch D. Synchronizing Receptacle; E. LCD Display Window; F. Low Battery Indicator; G. Rectifier Condition Indicator; H. Display Area for Clock Time, Starting Time, Countdown Timing and Settings for ON Cycle and OFF Cycle;... -
Page 9: Operations Overview
The uses for the JR-2 are too numerous to list. The following examples will serve as both a set up (programming) and typical use guide. These examples assume instant-off testing of multiple rectifier cathodic protection on a structure. - Page 10 MCM JR-2 Current Interrupter When using the JR-2 to interrupt on the DC side, the indicated polarities should be observed to reduce wear of the plating on the plunger of the mercury relay. Warning: Always observe the proper safety procedures when working on electrical equipment.
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Page 11: Ac/Dc Current Carrying Limits
MCM JR-2 Current Interrupter AC/DC Current Carrying Limits 11640 US Hwy 1, Sebastian FL 32958 Tel: 772-794-9448 ~ Fax: 772-589-9072 E-mail: sales@mcmiller.com ~ Web Site: www.mcmiller.com Instruments and Equipment for the Corrosion Engineer... -
Page 12: Example 1: Delayed Start - Interruption Begins Later
In other words, the units will be synched before the Start cycle time has occurred It is 7:00 in the morning and the JR-2's are in one location ready to be synched. They will be installed in the rectifiers before 8:00 am. -
Page 13: Cycle Begins Now
In other words, the units will be synched after the Start cycle time has occurred. It is 2:30 in the afternoon and the JR-2’s are in one location ready to be synched. They will be installed in the rectifiers later. The JR-2’s will start their On/Off cycle immediately and remain cycling until 5:00PM in the evening. - Page 14 MCM JR-2 Current Interrupter Procedure -All Units Display Reading 1. Power Switch ON PASS 2. Start Relay-Closed PASS 3. Press START SET, 8,0,0, ENTER (8AM) 8:00 4. Press STOP SET (6), 1,7,0,0, ENTER (5PM) 17:00 5. Press ON CYCLE, 2,0, ENTER (2 sec.) 2.00...
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Page 15: Example 3: Extended Delayed Start (Next Day)
MCM JR-2 Current Interrupter Example 3: Extended Delayed Start (Next Day) Test Requirements: Same as Example I. Work Schedule: Testing to begin 8:00AM the next morning. Present Time: 1:30PM Procedure: With the following exceptions, follow Example 1. Display Reading 1. Press START SET, 3, 2, 0, 0, ENTER... -
Page 16: Synchronizing A Model
MCM JR-2 Current Interrupter Synchronizing a Model JR-2 Suppose there are five JR-2’s in the field and one is accidentally turned off and needs to be restarted and resynchronized. All the units could be brought back to a single location, daisy chained together, and started as in example 2. -
Page 17: Maintenance
For example, there were 6 JR-2’s to be installed over a long distance by one individual. One JR-2 could be started and kept in the truck as a master. At each location, a single JR-2 could be started and installed using the above method. -
Page 18: Repairs
JR-2. No one other than qualified electronic technicians should attempt servicing the JR-2. Contact the M. C. Miller Co., Inc. if a problem arises. Low Battery Indication When the battery has discharged to a factory-set level, a LO BAT indication will display in the upper left portion of the display window. -
Page 19: Charging The Battery
MCM JR-2 Current Interrupter Charging the Battery A sealed lead acid gel-cell battery furnishes power for the JR-2. The front panel indicator, displaying state-of-charge, will be RED during the charging stage. When the battery is fully- charged, the charging indicator will turn GREEN and remain GREEN through the float stage. - Page 20 MCM JR-2 Current Interrupter Appendix 1 How to change the voltage setting on the JR2’s power entry module to match the supply voltage, and, how to replace the fuses WARNING: Disconnect the external AC power supply before changing the input voltage setting or...
- Page 21 MCM JR-2 Current Interrupter head screwdriver, as indicated in Figure 2. Insert the screwdriver into both slots in turn until the panel door pops open. The panel door can then be fully-opened, as indicated in Figure 3, by lifting the door at the far end (end furthest away from the 3-pin socket) and allowing the door to hinge as shown.
- Page 22 MCM JR-2 Current Interrupter the fuse holder from the power entry module by inserting the screwdriver into one of the two rectangular holes in the fuse holder, as shown in Figure 12, and lifting out the fuse holder with an upward movement of the screwdriver.
- Page 23 MCM JR-2 Current Interrupter Figure 1 Figure 2 Figure 3 11640 US Hwy 1, Sebastian FL 32958 Tel: 772-794-9448 ~ Fax: 772-589-9072 E-mail: sales@mcmiller.com ~ Web Site: www.mcmiller.com Instruments and Equipment for the Corrosion Engineer...
- Page 24 MCM JR-2 Current Interrupter Figure 4 Figure 5 Figure 6 11640 US Hwy 1, Sebastian FL 32958 Tel: 772-794-9448 ~ Fax: 772-589-9072 E-mail: sales@mcmiller.com ~ Web Site: www.mcmiller.com Instruments and Equipment for the Corrosion Engineer...
- Page 25 MCM JR-2 Current Interrupter Figure 7 Figure 8 Figure 9 11640 US Hwy 1, Sebastian FL 32958 Tel: 772-794-9448 ~ Fax: 772-589-9072 E-mail: sales@mcmiller.com ~ Web Site: www.mcmiller.com Instruments and Equipment for the Corrosion Engineer...
- Page 26 MCM JR-2 Current Interrupter Figure 10 Replacing the Fuses: Figure 11 Figure 12 11640 US Hwy 1, Sebastian FL 32958 Tel: 772-794-9448 ~ Fax: 772-589-9072 E-mail: sales@mcmiller.com ~ Web Site: www.mcmiller.com Instruments and Equipment for the Corrosion Engineer...
- Page 27 MCM JR-2 Current Interrupter Figure 13 11640 US Hwy 1, Sebastian FL 32958 Tel: 772-794-9448 ~ Fax: 772-589-9072 E-mail: sales@mcmiller.com ~ Web Site: www.mcmiller.com Instruments and Equipment for the Corrosion Engineer...
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