Section IV
Multiple Unit Configuration
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MINV-4000-1U-28 Guide www.synqor.com
Redundant Paralleling -R Option
The “R” option adds an electronic breaker to the AC output of the MINV to provide fault-tolerant,
glitch-free parallel operation. Should one unit experience a fault that could otherwise cause the
AC output to collapse, the breaker disconnects the failed unit from the AC bus. This allows the
remaining units to continue delivering power, provided the remaining units can support the total
load power. This allows users to create N+1 or N+M redundant systems.
These units can be arranged to form single-phase, Split Phase, and 3-Phase systems. Systems
with multiple phases will be N+1 or N+M redundant on each phase.
A failed unit can be removed and replaced while the system AC output is active. Special
consideration must be taken when connecting the outputs to avoid electric shock. It is strongly
recommended that the system AC output be disabled before a unit is removed or replaced.
CONFIGURATION cables for two unit and three unit single-phase systems are offered as
standard products. See the following pages for details. Contact the SynQor factory for Single
Phase systems larger than 3 MINV units, or for Split Phase and 3-Phase systems.
Systems created using expanded parallel MINV units will be fault-tolerant to the following events:
• Complete loss of power source (DC INPUT)
• Hardware failure of the AC output stage
The enable and disable behavior of systems using expanded paralleling is the same as systems
using standard paralleling; all MINV units will be enabled if one MINV is enabled. Units can be
enabled by actuating the front-panel “on” switches or by sending the appropriate signal over the
USER I/O cable.
Sending a “OUTPUT DISABLE” command to a MINV will cause only that MINV to be disabled.
Other MINV units in the system will continue running. Sending a “SYSTEM DISABLE” command
over the RS-232 interface will cause all MINV units in a system to turn off simultaneously.
For a detailed description of the terminal interface see the SynQor website at:
http://www.SynQor.com/MINV/documents/MINV_User_Commands.pdf
