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Parameterization
Auxiliary power
supply system
The parameter values are stored in the unit in a
non-volatile EEPROM memory. Thus the set-
ting of parameter values can be performed and
changed by means of the programming module
SACO 16PM or via the serial communication
using e.g. the SMS software. This means that
SACO 641D4 can be supplied from two sources
simultaneously. The supply inputs are galvani-
cally isolated. Two standard versions of supply
modules are available, type SWSM 220A48 and
type SWSM 220A220:
Supply module SWSM 220A48
Supply input 1: 17... 70 V dc
Supply input 2: 80...265 V ac/dc
Supply module SWSM 220A220
Supply input 1: 80 ... 265 V dc
Supply input 2: 80 ... 265 V ac/dc
SWSM 220A220 = 2 A
SWSM 220A48 = 4 A
AUXILIARY SUPPLY 1
AUXILIARY SUPPLY 2
Fig 20. Principle diagram for the power supply module SWSM 220A48 and SWSM 220A220.
Under normal operating conditions only one
of the supply inputs is used. The other input
operates as a back-up supply and will be acti-
vated when a fault occurs in the main supply.
Shifting from one supply to another is automatic
and interruption-free.
Energy from supply 2
= default programming
Fig 21. Selecting supply input to be used when both inputs are connected.
NOTE!
To obtain a closing function of the self-super-
vision relay at an internal fault, the soldered
jumper W3 on the input/output module SWIM
2 A
S1
the annunciator unit is fully field-programm-
able.
For connecting a PC directly to the serial inter-
face of the unit (for parameterization) the ca-
bles SPA-ZP 6A3 and SPA-ZP 21A are used.
The supply modules are easily exchanged due
to the plug-in construction. The insulation level
between the supply inputs and the electronics
and between the electronics and the field con-
tact circuits is 2 W, 50 Hz, 1 min.
The system operates with one supply voltage
too, but in such a case the signal contact of the
internal fault relay closes. A supply module op-
erating with one supply voltage, without pro-
viding a signal for internal system fault, is avail-
able on request.
The supply input to be used is selected by means
of the programming pins located on the left
power supply PC-board, close to the operation
indicator. The terminals are short-circuited as
shown below.
S1
Energy from supply 1
2A1B located to the right in the rack, has to be
shifted from a closing to an opening function.
FIELD CONTACT
SUPPLY 48 V DC
INTERNAL SUPPLIES:
+ 8 V DC
+/-12 V DC
+ 24 V DC
21
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