Schaefer Series C/B 3500 - Manual (Page 5)

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Options & Accessories Options & Accessories for Switch Mode Units
Output
The number of options per module may be restricted due to limitation of space inside the module or due to a limited number of
connector pins. Potentiometers or interface cards may be supplied separately for installation outside of the module.
General information
Parallel / redundant operation for DC output (details see page 125/126)
dd decoupling diode
A series diode built into the units output allows paralleling of 2 or more units for
redundancy or higher power or battery charging. For control purposes the anode of the
diode is also available at the output connector. It cannot be loaded ≥ 0.5A. The sense
signal is taken partially from the anode and partially from the load/cathode of the
decoupling diode. This guarantees starting and operating under all conditions, but it
also effects the regulation accuracy of 2%. In this way it gives a load sharing of 15-30%
between the paralleled units.
cs active current sharing
An additional control circuit provides active current sharing via an interconnecting wire
between converters that operate in parallel. The output lines of the converters have to be
in “star point” connection.
csi current sharing interrupt (“cs” included)
“csi” will effect the removal of the “cs” signal from the load voltage common connection.
Should there be an instance where a unit is not supplying the load, then the effect of its
current sharing signal is removed, and the load voltage is unaffected by this condition. In
terms of calibration the same criteria follow as for parallel operation.
icsi current sharing interrupt (“csi” included), galvanically isolated
The inclusion of “csi” (current sharing interrupt) and the galvanic isolation is the optimum
set up for systems with high power or high currents, were the voltage drop on the power
wiring could influence the cs signal.
ma master / slave operation (avalaible for series 6xxx)
Master / Slave interface permits the parallel function of identical modules to increase the
output power capapcity, shared by current control without any dynamic reduction in
performance.
Parallel / redundant operation for AC output
red inverter parallel operation: for series IT5xxx
For redundant operation or for increased output power, two inverters of the IT5xxx series
can be switched together. If one inverter fails, the internal contactor will be switched off
and the output power of one inverter is still available.
Inhibit
h1 inhibit by external closing contact, signal referred to input
The operation of the unit is inhibited when a voltage signal is applied in reference to the
negative line of the input. This can also be used in combination with a thermal trip, which
shuts the unit down.
h2 inhibit by voltage signal, signal referred to output
Operation of the unit is inhibited if a voltage signal (5V / 10mA) is applied in reference to
the negative line of the output.
h3 inhibit by closing contact, signal referred to output
The operation of the unit is inhibited when a voltage signal is applied in reference to the
negative line of the output. This can also be used in combination with a thermal trip,
which shuts the unit down.
Please note: Only relevant solution for inverters.
Automatic reduction of current limiting
rco reducing current limiting at over temperature
A circuit reduces the current limiting level at higher temperature (to be specified).
Please note:
Option is avalaible for series 48xx with ZVS topology and for high power converter
modules (see page 49).
DC output protection
rd reverse polarity protection for DC output
by reverse diode with external fuse
IN
IN
CS
CS
+
- OUT
IN
+
-
OUT
IN OUT
OUT
L
N
current
sharing
OUT
current
sharing
IN
IN
current
sharing
current
sharing
IN RCO OUT sec.
control
secondary
control
+
-
IN
IN
CSI
CSI
OUT
MS
SL
current
regulation
current
regulation
IN
IN
OUT
current
regulation
current
regulation
CSI
CSI
IV
IV
IN
OUT
IN
IN INH
sec.
control secondary
control
IN INH
sec.
control secondary
control
IN INH
primary
control
OUT
primary
control