Parallel Operation - Delta Electronics SM3300 Series Product Manual

INSTALLATION
• The operational isolation of SM18-220, SM66-AR-110 and
SM100-AR-75 allows a total series voltage of 1000V.
• The operational isolation of SM330-AR-22 and SM660-AR-11
allows a total series voltage of respectively 1330V and 1400V.
• Warning! The minus power output of the unit is allowed to be
maximum 1000VDC higher or lower than the Protective Earth,
regardless of the higher allowed series voltage!
• For more details, see Safety Instructions in chapter 2.
6.9

PARALLEL OPERATION

• The power supplies can be connected in parallel without
special precautions. Paralleling of the units has no limitations.
• Normal parallel operation of units High Speed Programming
units can give problems. Each combination has to be tested
first, in combination with the load!
6.10 OPTIONAL MASTER / SLAVE CONTROL
• For easy series or parallel operation the Master / Slave
interface is advised.
• Master / Slave parallel operation of High-Speed Programming
units is not recommended.
• See chapter 7 for more information about the M/S interface.
6.11 OPTIONAL POWER SINK
6.11.1 SETTING UP THE POWER SINK
• Settings for disabling/enabling can be made via the web
interface, see chapter 7.
6.11.2 POWER SINK OVERLOAD (PSOL)
• If the maximum sink power has been reached, the Power Sink
will go in overload and the sink current will be limited. In this
situation the Sink cannot absorb more power and the output
voltage of the supply will rise.
• On the front panel the PSOL icon will be blinking and the
status output 'PSOL' will be high.
6.11.3 THERMAL OVERLOAD (OT)
• If the Power Sink runs hot, the fan starts blowing to cool it
down. Once the situation of thermal overload has been
reached, the Power Sink and the output shut down completely
until the internal heat sink has cooled down again. In this
OverTemp situation the OT-status will be high.
6.11.4 SERIES OPERATION
• For series operation in combination with Power Sink option,
all units must have a Power Sink built inside otherwise no
power can be absorbed.
• When using Master/Slave mixed parallel/series operation,
automatically the Power Sink will be disabled for both Master
and all Slaves.
6.11.5 PARALLEL OPERATION
• For parallel operation in combination with Power Sink option,
only one unit can have a Power Sink. The output voltage of
this unit must be set 0.5% higher than the other units (to avoid
unintended sinking of Slave power).
• When using Master/Slave parallel operation, always set the
unit with the power sink as master. The firmware will
automatically reduce the voltage setting with of each Slave
with 0.5% to avoid unintended sinking and disable the Power
Sink in each Slave.
• When using Master/Slave mixed parallel/series operation,
automatically the Power Sink will be disabled for both Master
and all Slaves.
6.12 SPECIAL APPLICATIONS
6.12.1 PULSATING LOAD
• To avoid overheating the output capacitors, the AC compo-
nent of the load current should be limited (see fig. 6 - 13).
• One method of reducing the AC current through the output
capacitor is by using a large external electrolytic capacitor in
parallel with the load. Care must be taken so that the
capacitor in combination with the lead inductance will not form
a series resonant circuit!
• When using remote sensing on a pulsating load (for instance
17 / 32 DELTA ELEKTRONIKA B.V.
fig 6 - 12
For series operation the maximum series voltage is
between 1000VDC and 1400VDC.
Never exceed the 1000 VDC between the minus
power outputs and PE!
fig 6 – 13
Pulsating load current.
fig 6 - 14
Charging battery with a circuit breaker in series to
protect the internal diode.
SM3300
rev. June 2022