12. Monitor and status outputs
12.1 Monitor outputs
The output voltage and current can be read via two analog signals. Those signals are
proportional with the output parameters and are rated to + 10V. They are marked ‘‘V-Monitor’’
(TB 4-7) and ‘‘I-Monitor’’ (TB 4-13) and measured against TB 4-14.
Both monitor ouputs may be loaded with max. 10mA.
12.2 Status signals
Both status output are ‘‘open-collector’’ outputs, related to TB 4-8 and may be loaded with max.
100mA. Outputs are ‘‘low’’ active. If device works in constant current mode, the CC status output (TB
4-1) is always active. The OV status output (TB 4-2) is active if the OV protection circuit has turned
offthe power supply and remains active until the OV button is pushed or a OV-RESET signal is
applied.
ARGOS is equipped with a 2 step temperature control circuit. Whenever the temperature of the
Power-Mosfet´s approx. surpasses 65°C, the fan is switched to a faster speed. If the Mosfet-
temperature surpasses approx. 100°C an acoustic signal is generated and the OT LED indicator
illuminates (red). Simultaneously the output power is slowly diminished. During this state only the
MOSFET’s temperature (approx. 85°C) is regulated. The LED indicators CV and CC do not light up as
ARGOS under such conditions can not full fill the specifications.
This status is not latched and after the Mosfet´s are cooled the ARGOS goes back in a normal
operation mode (CC or CV).
14.
APPENDIX
Please note followings :
IEEE-488 / RS 232 INTERFACE ( OPT 34 ) Starting with Series Nr.: 907785 an automatic switching
from " INTERN " to " EXTERN " is implemented. If the BUS activates the IEEE-Interface, the
powersupply switches automatically in " Extern / Remote " mode. The command "LOCAL" switches
then automatically back to " INTERN " mode. For the RS 232 Interface the command " B1 " must be
sent in order to switch in " EXTERN / REMOTE " mode. The command " B 0 " switches back to "
INTERN " mode.
For the “IEE-488” interface, if the connection with the bus is interrupted, the power supply switches
back to “INTERN” mode. For the RS232 interface, an interruption causes no automatic switching. The
commands “B1” and “B0” may besent over the IEEE-488 bus too. If the command “B1” was sent, a
disconnection from the IEEE-488 bus will not cause automatic switching back to “INTERN”.
Argos 500
Page
16
von
16
ISSUE
07/05
