8 MJ-XL Control Panel Basic Troubleshooting
Siemens Power Transmission & Distribution, Inc. 51
Note: If password protection is in effect, you must
enter the password to enable calibration. The
default password for the <DIAGNOSTICS>
Menu is “3333”.
Repeat the above procedure for C/C2 Medium and C/C2
High. After calibration, replace J1 and Terminal Strip
jumper at P3B-11 & 12.
Note 1: Prior to calibration, disconnect panel from regulator, and remove on-board jumper J1 (see Figure J.1) and Terminal Strip jumper at
P3B-11 & 12. After calibration, replace J1 and Terminal Strip Jumper at P3B-11 & 12.
8.5 MJ-X
L
Self Testing
After reset, the MJ-X
L
runs through an internal diagnostics
routine. The start-up diagnostics routine includes a front
panel indicator test—the LED indicators simultaneously
flash three times so that an operator can verify them. Dur-
ing the LED test, the MJ-X
L
displays “Testing...” on the
front panel screen.
The start-up diagnostics routine consists of several checks
and internal tests, including a ROM (program memory)
checksum calculation. The MJ-X
L
displays the results of
the checksum test (PASS or FAIL) in the “Checksum=”
item under the <DIAGNOSTICS> Menu.
A checksum failure indicates a problem with the unit. A
checksum or other self-test failure will activate the “Self
Test Fault” alert. If this alert occurs, contact your Siemens
Power Transmission & Distribution representative for
instructions.
8.6 Communications Module
Troubleshooting
In the <DIAGNOSTICS> Menu, the MJ-X
L
Control Panel
provides data items for testing the Communications Mod-
ule and verifying its operation. Please refer to the MJ-X
L
Communications Module Installation Manual for verifying
the Communications Module operations using the
<DIAGNOSTICS> Menu data items.
Table 8.2 Voltage and Current Calibration
Signal to
Calibrate
Test Signal
Application
Point
Test Signal
Measurement
Point
Nominal
Calibration Signal
Magnitude
Tolerance MJ-X
L
Data Item
<DIAGNOSTICS>
Menu
Conditions
U2 U2 to E
(P2A-8 & 6)
Voltage Calibration
Terminals
120 VAC (RMS) ±0.5 VAC U2 Cal U2/P2 key
= U2
P2 P2 to E
(P2A-4 & 6)
Voltage Calibration
Terminals
120 VAC (RMS) ±0.5 VAC P2 Cal U2/P2 key
= P2
C/C2
Low
C2 to E1
(P2A-5 & 7)
C/C2
(P3B-11 & 12)
5 mA (RMS) ±0.2 mA C/C2low Note 1
C/C2
Medium
C2 to E1
(P2A-5 & 7)
C/C2
(P3B-11 & 12)
80 mA (RMS) ±0.5 mA C/C2med Note 1
C/C2
High
C2 to E1
(P2A-5 & 7)
C/C2
(P3B-11 & 12)
140 mA (RMS) ±0.7 mA C/C2high Note 1
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