Made in Germany
Camtec Power Supplies GmbH - Gewerbestraße 30 - DE-76327 Pfinztal / Germany
S.9/20 (07/2017.01.0)
Tel. +49 (721) 46596 - 0 Fax +49 (721) 46596 - 77
www.camtec-gmbh.com
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(Technical changes and errors reserved. This product may not be used in life support systems.)
Continuous Mode
If you select Continiuous Mode at DIP switch S12 (DIP switch S12=1), the device provides continuous power. It
also applicable in the Constant Current Mode. Factory setup = Continuous Mode
Over Load Behaviour
The CPS-EX changes from the standard opartion mode into the high current mode when high and quick over
load occurs. Thus it provokes a restart after a 30ms break and delivers continous current to the output. This
special behaviour is a protection for the power supply and for the connected load.
Compensation of Load Line Drop Voltage (Sense ++/--), standard operation mode
The CPS-EX power supply has a Sense Mode to compensate for the voltage drop over long load lines. The
compensation amounts to a maximum of 2V per load line. Under certain circumstances, it can be expected to
apply fairly more complicated external interference suppression. If sense is not used, CON4 Sense +/+ and
Sense -/- shall necessarily be connected by short bridges to the power outputs (factory setup).
Sense operation: Remove the bridges between Sense +/+, Sense -/- and the power outputs. Connect the sense
lines directly to the load. It is irrelevant which of the local connections Sense +/+ and Sense -/- are applied. Pay
attention to the polarity of plus and minus of the load to prevent damage to the power supply. To avoid
interference, twist the sense lines. In order to reduce inductive effects, we recommend that the load lines
position is close to each other. In order to supply a pulsating load, the use of an electrolytic capacitor and a
cermic capacitor has proved. The internal Over Voltage Protection (OVP) of the power supply controls the DC
power directly to the DC output terminals. In case of an error the OVP acts automatically (see OVP values
corresponding table).
Operating in the sense mode requires that the maximum output voltage will not be exceeded. Maximum 2V per
load lead can be compensated. The voltage drop in the load lines decreases the maximum output voltage
rating. For example for a 30V unit: if the total voltage drop in the load leads is 2V you must substract this value
from the maximum programmable output voltage 30V – 2V = 28V maximum available voltage at the load.
The sense terminals are directly connected to the power outputs.
Lokal Sensing
Remote Sensing
(factory setup) (twisted sense lines)
Compensation of Load Line Drop Voltage (Sense ++/--) battery charger operation mode
Remote Sensing as a battery charger
If the CPS-EX power supply unit is used as a battery charger, it is recommended to refrain from sensing. It can
lead to severe damage to the power supply, if the polarity of the sense line is confused (field experience: such
error often occurs when system service is required, e.g. when the batteries are changed). If it is absolutely
necessary to use sensing, proceed as described in the figure below. Proven approaches are 250mA for the
fuses and 3...5A load capacity of diodes.
