Appendix K: Terminal Strip Connections
Siemens Energy, Inc. 79
Table K.2 below describes the connections for terminal strip P2B. See Table 2.5 for complete descriptions of these terminal
connections. See Figure 2.3 for simplified schematic drawing of remote control connections.
Table K.2 Connections for Terminal Strip P2B
Pin Number Signal Name Description I/O / Power
1 BAL This signal is actually E, (AC return.) The intended application of this signal is in con-
junction with +P to permit the MJ-4 sense voltages to be adjusted by the value
present on an external transformer winding. The transformer winding is inserted into
the MJ-4 circuit at +P and BAL.
Ground
2 +P This signal connects to one side (the "ground" side) of the MJ-4 sense transformers.
See description for BAL.
Input
3 J21 This signal connects to the J Relay output of the MJ-4. Normally, this signal is jum-
pered to J22 to complete the MJ-4 Raise motor circuit. Alternatively, a relay (or switch
contacts) can be connected across the J21/J22 contacts to provide external control
over the MJ-4 automatic Raise motor circuit.
Output
4 J22 This signal is wired to J [P2A-9]. J22 is normally jumpered to J21. Alternately, J22 can
be connected to an external motor control signal.
Input
5 U_REM (R) This signal gets AC power from U6 when the Remote-Auto/Off/Manual switch is in the
Remote/Auto position. This signal is provided so that external relay contacts can be
connected from Rem R to J22 (the Raise motor control signal). MJ-4A ONLY
Power
6 U_REM (L) This signal gets AC power from U6 when the Remote-Auto/Off/Manual switch is in the
Remote/Auto position. This signal is provided so that external relay contacts can be
connected from Rem L to K22 (the Lower motor control signal). MJ-4A ONLY
Power
7 K22 This signal connects internally to the K signal (Lower motor control). This signal is nor-
mally jumpered to K21, but it can be connected to an external motor control signal.
Input
8 K21 This signal connects to the K Relay output of the MJ-4. Normally, this signal is jum-
pered to K22 to complete the MJ-4 Lower motor circuit. Alternatively, a relay (or switch
contacts) can be connected across the K21/K22 contacts to provide external control
over the MJ-4 automatic Lower motor circuit.
Output
9 U7 This circuit provides AC power to K7, which provides power to the J and K relays. The J
and K relays implement the MJ-4's automatic tap control operations. This signal is nor-
mally jumpered to U6, but it can be connected to an external AC source. [Alternatively,
an external relay contact can be placed between the U6 and U7 contacts for external
control of the MJ-4 automatic tap operations.]
Power
10 & 11 U6 This signal provides AC power for both Remote and Manual tap control operations.
This circuit provides AC power to the common of the Tap Raise/Lower switch when
the Remote-Auto/Off/Manual switch is in the Manual position. This circuit provides the
AC power to the Rem R and Rem L terminal block contacts when the Remote-Auto/
Off/Manual switch is in the Remote position. It is normally jumpered to U at the termi-
nal block, but it can be connected to an external AC source. [Alternatively, an external
relay contact can be placed between the U and U6 contacts for external control of the
MJ-4 manual and remote operations.]
Power
12 U This is the signal from U2, after the power switch (assuming the switch is in the "Nor-
mal" position.) This signal is normally jumpered to U6 at the terminal block unless an
external circuit is used to feed U6.
Power
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