SynQor MINV-4000-1U-28 Series, Operator'S Manual

Page: 32 / 48

Section IV Multiple Unit Configuration
006-0006885 08/14/18 Rev H 32 of 48 MINV-4000-1U-28 Guide www.synqor.com
Connection of the DC INPUTS
Whether there are two or three MINV units in the multiple-unit configuration, there are several
ways that the DC INPUTS can be connected to sources of power:
• They could be connected to the same DC source.
• They could be connected to different DC sources.
All that is necessary is to ensure that the input voltage falls within the specified range of the
DC INPUTS of the individual MINV units.
Furthermore, the individual DC INPUT cables can be first combined into a single cable (of
appropriate minimum wire size), or they can be left as separate cables, each connected to the
desired DC source.
Multi-Unit AC OUTPUT On/Off Control – Expanded/Redundant Parallel (-F/-R option)
In multi-unit operation, a single front panel “on” switch actuation, “remote-on” rear panel signal
input, or
OUTPUT ENABLE
serial command will cause all MINV devices to enable their outputs.
Redundant parallel units (“R” option) come with a floating neutral wire by default. Any “off”
front panel switch actuation, “remote-off”, or
OUTPUT DISABLE
serial command will only disable
that specific MINV. Sending the
SYSTEM DISABLE
serial command to any MINV system in a multi-
unit configuration will cause a coordinated shutdown of all AC OUTPUTs. If any single MINV no
longer has a valid input power source (e.g., no DC input), it will shut down while the AC OUTPUTs
of the remaining systems stay active.
AC OUTPUT Neutral Grounding
MINV units combined in multi-unit configurations must have the neutral floating “F” factory option
to prevent the possibility of circulation protective earth currents. Redundant parallel units (“R”
option) come with a floating neutral wire by default. If a grounded output neutral is required, then
the output neutral should be connected to protective earth ground (PEGND) in one spot. The size
of the neutral-to-PEGND connecting conductor must be sized to match the largest combined AC
output neutral conductor specified in the following wiring diagrams.
Wiring Caution
WARNING:
LETHAL VOLTAGES MAY BE PRESENT ON MINV AC OUTPUT CONNECTIONS. ALL AC
OUTPUT CABLE CONNECTORS MUST BE INSTALLED DURING OPERATION AS A DISCONNECTED
CABLE CONNECTOR MAY HAVE EXPOSED VOLTAGE PRESENT FROM ANOTHER UNIT IN THE GROUP.