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W Series Data Sheet
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125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
Table 19 : System OK (M1 with external battery sensor)
System Status
System OK
Battery overchared / temp. sensor
defect / control voltage to high
Overload, converter cannot follow the
control signal
Output does not follow control signal,
since battery would be overcharged
System OK
Input
O.K.
O.K.
O.K.
O.K.
O.K.
V control
sensor signal
2.7 V
2.7 V
2.7 V
3.0 V
2.5 V
V Bat
theoretical
27 V
27 V
27 V
30 V
25 V
V Bat
measured
27 V
28 V
24 V
27 V
25V
Sys-OK
output
Low ohmic
High ohmic
High ohmic
High ohmic
Low ohmic
V o = 50 – 100% V o nom . R ext1 ≈ 4 k ? ? –––––––––
V o = 100 – 110% V o nom . R ext2 ≈ 4 k ? ? ––––––––––––––––
R: Adjustment of V o or V o2
The R input allows external adjustment of the output voltage in
the range of 50% to 110% V o nom . Double-output models allow
only adjustment of output 2 (connected to the terminals 6, 7, 8
and 9). This enables asymmetric output voltage configuration.
Adjustment can be achieved via a resistor or an external
voltage source (in the range of 1.25 – 2.75 V).
Note : If the R input is not connected: V o or V o2 ≈ V o nom .
a) Adjustment by an external resistor:
Resistor R ext1 , connected between R (pin 2) and GND1 (pin
1) of the D-SUB connector or according to fig. 20.
V o
V o nom – V o
Resistor R ext2 , connected between R (pin 2) and VCC (pin 3)
of the D-SUB connector or according to fig. 20.
V o – 2.5 V
2.5 V?( V o / V o nom –1)
Note: If the R function is not included in M1 or M2, refer to figure
20 how to connect R ext1 or R ext2 .
b) Adjustment by an external control voltage V ext (1.25 – 2.75
V), connected between R (pin 2) and GND (pin 1) of the D-
SUB connector or according to fig. 20.
to-phase connection at low mains voltages (e.g., USA 120 V/
208 V / 60 Hz systems).
The built-in second fuse also enables safe connection to the
mains, where phase and neutral are not defined or cannot be
identified, as e.g., in the case of plug and socket connection to
the mains via German Schuko-plugs; see also Safety and
Installation Instructions .
Option F limits the DC input voltage to ≤ 250 V.
Q: Reverse Polarity Protection
EW models have no bridge rectifier at the input. To provide
reverse polarity protection, an additional diode can be fitted.
However this lowers the efficiency by approximately 1%.
K2: System Connectors
For installation in systems using pre-assembled harnesses the
converters are available with system connectors. They are UL-
listed, approved for currents up to 15 A at –40 to 105 °C.
The mating system connectors with screw terminals and
retainers are delivered together with every converter with
option K2. Use max. 2.5 mm 2 (AWG 12) solid or stranded
wires, or max. 1.5 mm 2 (AWG 14) stranded wires with crimp
termination, stripped length 6 mm. Tightening torque of input/
output terminals: max. 0.79 Nm (7 lbs.in.).
G: RoHS
V ext ≈ 2.5 V ? –––––
V o ≈ V o nom ? ––––
V o
V o nom
V ext
2.5 V
RoHS compliant for all six substances.
Caution: To prevent damage, V ext should not exceed 3 V, nor be
negative.
Note: If longer wires are used to connect the R input at the D-SUB
connector, the wiring to pin 1 (GND1) should be done as star point
connection. If wired differently, the output voltage setting may be
adversely affected.
In battery charging systems, an external battery temperature
sensor (see Accessories ) can be connected to optimize V o .
However, adjustment using the R input (pin 2 of D-SUB) is
possible as well. The above shown formulas are valid, but
V o nom stands for the voltage with open R input ( = V o safe ).
F: Built-in Second Fuse
A built-in second fuse in the neutral line provides safe phase-
Fig. 24
System connectors Option K2
BCD20020-G Rev AC, 31-Jan-2013
Page 23 of 25
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