User manual

Operating the device

It is recommended to dene one unit as master that controls

voltage and current of the system. At any slave the set values of

voltage, current and power (if available) should be set to 100%.

All units displays their actual values, there will be no totals for-

mation of the system output current.

Inordertocontrolthewholesystemremotely,itissufcientto

control the master via its analogue or digital interface. When

reading actual values, the voltage monitor value will represent

the overall system voltage, but the current monitor only the output

current of the master. In order to get accurate readings, either the

actual current is multiplied by the number of units in the parallel

connection (only applicable if all have the same nominal output

current) or all units will have to be read seperately.

For an example wiring see gure6.

Figure 5. Series connection in Master-Slave

11.3 Networking

Figure 7 and 8 depict networking examples for the digital control

of multiple devices in star-shaped (USB, RS232) or bus-like (CAN,

GPIB)conguration.

Limitationsandtechnicalspecicationsofthebussystemsand

the interfaces apply.

With USB up to 30 units can be controlled with one PC, appropri-

ate USB hubs with custom power supply assumed.This basically

applies to RS232, too. Differences lie in the handling and the

cable lengths.

With CAN up to 30 power supplies per address segment can

be integrated into a new or existing CAN bus system. They

are addressed by the device node and the RID (see „8. Device

setup).

With GPIB there is a limitation of max. 15 units on one bus, con-

trolled by a GPIB master. Multiple GPIB masters can be installed

in a PC in order to increase the number of addressable units.