Siemens MJ-4A Installation And Operation Manual page 70

Appendix D: Menu Parameters
If the Un - - Ux taps are to the left of E2 with no taps to
the right of E2, and the polarity mark is on one of the
U taps, specify Utility Pol: NORM. (See Figure D.1.)
Single-Phase Straight Design - Taps to the
Figure D.1
Left of E2
If the Un - - Ux taps are to the right of the E2, and the
polarity mark is on the E2 tap, specify Utility Pol: REV. (See
Figure D.2.)
Figure D.2 Single-Phase Straight Design - Taps to the
Right of E2
Table D.3 Nameplate for Single-Phase Straight Regulator with Cooling Fan
Single Phase Straight Regulator with Cooling Fan
Load Volt Tran Control Panel P to
Volts Sec Conn P14 to
+/-10% P2 to
14400 P3 - 120 20
13200 P4 - 120 20
7200 P5 - 120 20
From the table, the system load voltage is 7200 volts; therefore, U2 would be connected to U6. Now check the connection
diagram:
66
Basis Aux Volts Motor
Volts Conn U2 to Volts
20 120 U3
20 120 U4
20 120 U6
D.3.1.3 Single-Phase Straight design regulators
(ANSI type A) with forced air cooling
For these regulators, the Utility winding not only provides
power to the controller — it also provides power for the
forced air fan(s). The E2 tap is located between the Un - -
Ux terminals on the regulator's nameplate schematic. The
U5 tap is normally used for fan voltage and can be either
to the left or to the right of E2. To determine whether the
polarity is 'normal' or 'reverse' , you must examine both the
schematic diagram and the connection table on the name-
plate. From the connection table, determine the tap to
which U2 should be connected.
• If the tap to which U2 is connected and the polarity
mark are to the left of E2 on the schematic, set Utility-
Pol:NORM.
• If the tap to which U2 is connected is to the right of
E2 on the schematic, set UtilityPol:REV.
Examples
For both of the examples on the next page, use the
nameplate connection table shown in Table D.3:
Fan Connection
U21 to
126 U3
126 U53
126 U6
U15 to Volts
U7 240
U7 242
U8 240
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