DC/DC Converter
PSC30
User Manual
Page 11 (24)
©2009. ELTEK VALERE DEUTSCHLAND GmbH.
UM_PSC30_E_EVD_2011-01-19.doc
6. External
Functions
6.1
Output voltage sensor leads
Possible voltage losses at wires, terminals or diodes as well can be compensated by the sense link
for the output voltage. The max. regulation difference is approx. 4 % of the nominal voltage.
Break of the sense link, confusing of poles or short circuit can not damage the module. At cable
break of the sense link, a voltage increase of max. 4% is possible.
6.2
Temperature compensation of charging voltage
For the use of closed batteries we recommend the temperature controlled compensation of charge
voltage. Connect an external active temperature sensor (option) to the related signalling connector.
The standard set temperature coefficient is -4mV/K per cell (for a temperature range of 0-50 °C).
The basic temperature is 20°C. The coefficient can be adjusted between -1 to -6mV/K per cell (see
section 5.4). Connect the sensor with a 2-pole wire (0.25mm
2
). It can be directly mounted on top of
the battery or on battery poles. At great distances (> 2m) we recommend to use a shielded wire
with connection of the shield to modules ground.
6.3
External switch ON/OFF
The SMPS can be switched on/off by an external signal. The input is potential free due to an opto
coupler and fulfills the requirement for safe electrical decoupling to mains and output side. The sig-
naling voltage is 10-24 V, the internal resistance 2.7 kOhm. The input is protected against reverse
polarity of the poles. At higher supply voltages the current in the control circuit has to be limited to
5-7mA using a resistor (for instance 6.8 kOhm at 48/60V DC).
6.4 Discharge
test
It is possible to test the capacity of a battery which operates in parallel to the module(s). To select
the discharge test mode you have to connect
–Vo
to pin 2 of the output connector
X2
(see section
7.4). The discharge test voltage can be adjusted by the user (parameter VO3; see section 5.4). If the
discharge test mode is active, the LED V
O1
is ON; LED V
O2
is OFF.
6.5
Boost charge mode
The module has a second charge line (boost charge line). To select this mode you have to connect
+Vo
to pin 2 of the output connector
X2
(see section 7.4). The boost charge mode is signalized by
LED V
O2
. The voltage value can be adjusted by the user (see section 5.4).
NOTE:
For 60/110/220V units: For the connection to +V
O
an additional series resistor is to be used
(60 V: 18kOhm; 110 V: 56kOhm; 220V: 150kOhm).
