3.2 Module status
The module status is displayed by two LEDs on the front panel
green LED „OK“ on
all channels have the status “OK“
green LED „OK“ off
an error occured: safety loop is possibly not closed or the power supplies are out of
tolerance or the threshold of V
max
, I
max
, I
set
or I
trip
(see function descriptions for details)
has been exceeded
LED will be switched off until the error has been fixed and the corresponding status bit
has been erased via software interface.
yellow LED on
one or more channels voltage on output is more than 56V
green LED blinking
Firmware update is stored into flash, do not switch of power supply, crate etc.
Table 10: Module status information
3.3 Hardware Limit
The maximum output voltage for all channels (hardware voltage limit) is defined by the position of the corresponding
potentiometer V
max
. The maximum output current for all channels (hardware current limit) is defined by the position of the
corresponding potentiometer I
max
. The highest possible set value for voltage and current is given by V
max
– 2% and I
max
– 2%,
respectively. It is possible to measure the hardware voltage and current limits at the sockets below the potentiometer. The socket
voltages are proportional to the relative limits, where 2.5 V corresponds to 102 ± 2 % V
nom
and 102 ± 2% I
nom
. The output voltage
and current are limited to the specified value. If a limit is reached or exceeded in any channel the green LED “OK” at the front
panel turns off.
3.4 Safety Loop
A safety loop can be implemented by the safety loop socket (SL) on the front panel and between the SLcontacts (Pin 22 and
PIN 30) at the REDEL-connector, if equipped. If the safety loop is active a high voltage generation in any channel is only possible 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. (For modules
with a REDEL-connector the front panel SL input must be shortened.) If the safety loop is opened during the operation the output
voltages will be shut off without ramp, the corresponding bit in ModuleStatus is canceled and in ModuleEventStatus ist set
(see
CAN_EDCP_Programmers-Guide.pdf
). After closing the loop again the ModuleEventStatus has to be reset and the channels
have to be switched ON. The loop connectors are potential free, the internal voltage drop is approx. 3 V. By factory setup the
safety loop is not active (the corresponding bits are always set). The loop can be activated by removing the jumper “SL-disable” on
the rear side of the module.
3.5 Delayed Trip
3.5.1 Operating principle
The function "
Delayed Trip
" provides a user-configurable, time-delayed response to an increased output current (I
out
) higher than
the set current (I
set
). The response to this kind of event can be, for example, to ramp down the channel with the programmed
ramp. A detailed description for the configuration can be found in the manual
CAN_EDCP_Programmers-Guide.pdf
).
By a programmable timeout with one millisecond resolution, the trip can be delayed up to four seconds. During this time, the
output current is limited to the value of I
set
(constant current mode).
The hardware regulation signals, constant voltage (CV) or constant current (CC), are sampled every millisecond by the
microprocessor. Once the constant current mode is active, the programmed timeout counter is decremented. If the HV channel
returns to constant voltage mode before timeout (i.e. I
out
< I
set
), the counter will be reset. So this process can be restarted if the
current rises again.
EHS High Voltage Power Supply series | Last changed on: 16.01.2020 |
www.iseg-hv.com
18/42
