Section IV
Control Interface Details
006-0006715 10/31/18
Rev J
39 of 44
MPS-MPPS-4000 Guide
www.synqor.com
Parallel Operation of Multiple Units: MPPS
Interconnecting Multiple Units via the Configuration port using cable SYN‑9322 or SYN‑9323
enables synchronized start-up, shutdown, and current sharing of connected Units.
Turn-On, Turn-Off, Restart Control:
When an MPPS device is in the Standby Mode (input power applied but output not enabled),
and its output is enabled via the front panel switch, remote enable input, or serial command,
all other MPPS devices that are also in the Standby Mode will enable their outputs at the same
time. Likewise, when a Unit is operating and its output is running, if its output is disabled via
the front panel switch, remote shutdown input, or serial command, all other MPPS devices
that are also operating will disable their outputs at the same time. These features are enabled
by default when the SYN‑9322 or SYN‑9323 cable is utilized to interconnect multiple MPPS
devices. The features can be disabled via the serial interface using the SYNCCON OFF command,
and this setting is stored in non‑volatile memory. These features can also be disabled via the
web interface.
Parallel Operation, Current sharing:
When Parallel operation has the following requirements and characteristics:
- Configuration cable SYN-9322 or SYN-9323 must be used to parallel
two or three Units respectively
‑ All MPPS Units must have the same programmed Vset value.
- MPPS Units will share to ±3A of the average output current at full load.
- Ideal diode on the output of the MPPS prevents circulating currents.
When MPPS Units are placed in parallel, a digital current sharing algorithm adjusts the output
voltage of each MPPS slightly to ensure each Unit is delivering approximately the same amount
of current. If the MPPS Units have different programmed values for Vset, the current share
algorithm will not run. This will not cause damage to the MPPS Units, however it is very
likely they will not share current evently. Output cables should be constructed so the output
resistance is approximately equal for each MPPS Unit.