MDCAT
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8139 Rev.4 P. 4 / 4
MAINTENANCE
Check surge protectors periodically. Many cases of lightning are ignored, and even lightning at a far distance often causes
inductive surges.
We recommend that you check your surge protector about twice a year, before and after the rainy season. Check whenever
you experience a strong lightning occurrence.
Checking procedure is explained in the following:
■
CHECKING
WIRING
• Make sure that wiring is done as instructed in the connection diagram.
DISCHARGE ELEMENT
Approximate checking can be conducted as following.
1) Remove all LAN cables connected to the MDCAT.
2) Remove also the shortcircuit bar.
3) Connect between the surge side modular jack and a modular jack type rosette with a LAN cable and remove the rosette’s
cover to expose its connecting pines.
Modular Jack Type Rosette
(Harmonet HLA-T-MJ-8)
(1)
(2)
(3)
(4)
(8)
(6)
(7)
(5)
G
SHLD
4) Shortcircuit Test
Check resistance across the following terminals on the high resistance range of multimeter and confirm no conduction.
(The meter will indicate the same value as it will show when these terminals are open.)
SHLD – G
Then, apply ±6V DC (for MDCAT-5E) or ±3.3V DC (for MDCAT-6) across the following terminals and measure leakage cur-
rent to show ≤ 25μA (for MDCAT-5E) or ≤ 5μA (for MDCAT-6). If a voltage generator is not available, check resistance with
a multimeter and confirm no conduction. (Use of a voltage generator is strongly recommended.)
Rosette pins (1) – (2), (3) – (6), (4) – (5), (7) – (8)
Then, apply ±58V DC across the following terminals and measure leakage current to show ≤ 5µA. If a voltage generator is
not available, check resistance with a multimeter and confirm no conduction. (Use of a voltage generator is strongly recom-
mended.)
Rosette pins (1) – (3), (2) – (6), (4) – (7), (5) – (8)
5) Discharging Test
Check that discharging occurs across the following terminals with a ±500V DC 1000 MΩ insulation tester.
(The tester shows ≤ 20MΩ.)
Each rosette pin of (1) through (8) – G, SHLD – G
