Rockwell Automation 1402-LSM Line Synchronization Module Installation Instructions - Manual (Page 15)

Chapter 2
Installation
2–5
Connection for Three Phase Delta, 3 Wire Systems with 3 PT’s & 3 CT’S
When configured for ungrounded (floating) Delta operation, the LSM senses
the L–L voltages between each of the phases. The “Voltage Mode” of the
LSM should be set to “2” (as described in Chapter 3, “General Operation”).
Figure 2.3 shown on Page 2–9 provides the wiring diagram for this
configuration. Wiring and polarity marks must be exactly as shown for
correct operation.
Connection for Three Phase Open Delta, 3 Wire Systems with
2 PT’s & 3 CT’S
When configured for ungrounded or Open Delta operation, the LSM senses
the L–L voltages between each of the phases. The “Voltage Mode” of the
LSM should be set to “4” (as described in Chapter 3, “General Operation”).
Figure 2.4 shown on Page 2–10 provides the wiring diagram for this
configuration. Wiring and polarity marks must be exactly as shown for
correct operation.
Connection for Three Phase Open Delta, 3 Wire Systems with
2 PT’s & 2 CT’S
When configured for ungrounded (floating) Open Delta operation, the LSM
senses the L–L voltages between each of the phases. The “Voltage Mode” of
the LSM should be set to “4” (as described in Chapter 3, “General
Operation”). Figure 2.5 shown on Page 2–11 provides the wiring diagram for
this configuration. Wiring and polarity marks must be exactly as shown for
correct operation.
Neutral Connection
The voltage reference terminal, “Neutral”, of the LSM serves as the zero
voltage reference for voltage readings. A low impedance Neutral connection
is essential for accurate measurement. The length of the wire should be as
short as possible. It should be made using a dedicated size 2.0 mm
2 (14
AWG) wire, or larger, to a point in close proximity to the LSM. This will
provide minimal voltage error due to other distribution voltage drops.
The connection point for “Neutral” is the point where the PT secondary leads
are common.
PT and CT Wiring Connections
Continued