MCM JR-2 Current Interrupter
11640 US Hwy 1, Sebastian FL 32958
Tel: 772-794-9448 ~ Fax: 772-589-9072
E-mail:
~ Web Site:
www.mcmiller.com
Instruments and Equipment for the Corrosion Engineer
9
Operations Overview
A. Turn Power Switch "ON";
B. Select Start Relay is Closed (Also applies to Stop or
Night Latch, i.e., Start Closed -Stop Closed;
C. Enter operating time requirements under the five
function keys;
D. Synchronize all units to be used, to each other;
E. Install units in system to be tested to include:
Observing polarity if DC is to be interrupted.
The JR-2 contains an EEPROM, which retains the last entry
made under the five function keys. Factory testing will leave
an existing program, which will be overwritten by the
next entries.
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.
Note: ALWAYS USE THE MILITARY TIME FORMAT
WHEN ENTERING TIME DATA.
FOR EXAMPLE: 18:00 INSTEAD OF 6:00 PM
Installation of the Interrupter in the Rectifier
In general, it is physically easier to interrupt across the taps
of the rectifier. In addition the tap location is best because
breaking AC causes less wear on the relay. This is due to
the AC crossing zero volts and extinguishing the arc,
whereas DC depends on the distance of the gap to
extinguish the arc. The next best location to interrupt is the
AC power supply. The DC side may also be interrupted at
the anode or structure leads (
+
) or (
-
) output of the rectifier.
