3.4 Remote Control
The NHR devices offer two remote control interfaces: USB and CAN.
With the USB connector, one NHR can be controlled with the
. Available control applications are
and
(see appendix) for further details.
With the CAN interface connectors, up to 64 NHR/NHS devices can be controlled on one CAN line. Therefore every device
has to have a unique CAN Bus address, which can be configured in the Device Menu. Please consider
for further details.
3.5 Polarity and Output-Mode selection
For all channels of NHR devices the polarity can be electronically switched. This can be done via the front panel
(
MENU
➜
CHANNEL SETUP
➜
CHANNEL X
➜
POLARITY
) or via remote control.
Modules with V
nom
= 6kV (except option
L
) also provide switchable HV-output modes which allow to switch the nominal
values of a channel between 2kV/4mA, 4kV/3mA and 6kV/2mA. This can be done via the front panel
(
MENU
➜
CHANNEL SETUP
➜
CHANNEL X
➜
OUTPUT-MODE
) or via remote control.
Switching the polarity or output mode is only allowed if the corresponding channel is switched off and discharged below
0.002
•
V
nom
. The module blocks all switching attempts if these conditions are not satisfied.
CAUTION!
CAUTION!
The device is not designed to operate as a current sink.
Never apply external voltages of opposite polarity to the selected one or with values greater than the
maximum value of the selected output mode. This can damage the module.
3.6 Protection Features
3.6.1. Hardware Limit
The maximum output voltage for all channels (hardware voltage limit) is defined through the position of the
corresponding potentiometer V
max
. The maximum output current for all channels (hardware current limit) is defined
through the position of the corresponding potentiometer I
max
. The greatest possible set value for voltage and current is
given by V
max
– 2% and I
max
– 2%, respectively. The percental values always refer to the nominal values of the channel,
V
nom
and I
nom
. E.g. for a 6kV/4mA module the reference values are 6kV and 4mA, independent of the selected output
mode. The output voltage and current are limited to the specified value. If the maximum voltage or current of the
selected output mode (V
mode
or I
mode
) is below this limit, this will further limit the output.
If a limit is reached or exceeded in any channel the corresponding green LED on the front panel turns off.
3.6.2. Safety Loop
A safety loop can be implemented via the safety loop socket (SL) on the front panel.
If the safety loop is active, then an output voltage in any channel is only present if the safety loop is closed and an
external current in a range of 5 to 20 mA of any polarity is driven through the loop. The loop connectors are potential
free, the internal voltage drop is approx. 3 V.
If the safety loop is opened during the operation, the output voltages are shut off without ramp. Furthermore, the
corresponding bits in the „
ModuleStatus
“ and „
ModuleEventStatus
). After closing the loop again, the „
ModuleEventStatus
“ register must be reset to turn the channels on again.
By factory setup the safety loop is not active (the corresponding bits are always set). The loop can be activated by
removing the internal jumper. The jumper can be accessed via a ventilation slot on the bottom of the module
(
dimensional drawings for exact position
).
NHR – NIM standard High Voltage Power Supply | Last changed on: 25.11.2019 |
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