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
3.4.1 Safety Current Loop
A safety current loop can be implemented through the safety loop socket (SL) on the front panel and, if available, on the modules
with 8, 16, 24 and 32 channels at the REDEL-connector between the SL contacts (pin 22 and pin 30). When the safety loop is
active, high voltage can only be generated in a channel if the safety loop is completely closed (SL plug and in the case of Redel
plug, pin22 and pin30 on the plug, in the cable or on the detector supply are bridged) and an external current in a range of 5 to
20 mA of any polarity is driven through the loop. 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
” is set (see chapter
11 Appendix, “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 ( Figure 1: Jumper configuration on back side).
3.4.2 Safety Return (SRTN)
In the case of the modules with 48 channels, safety current loop cannot be conducted over the Redel-connector because of the
limited pin number. In order to only allow HV generation when the Redel plug is inserted, Pin26 of the Redel plug is used as a
safety contact. Pin 26 must be connected to the RTN pins (Pin22 or Pin30) on the connector, in the cable or on the detector
supply. If this connection is missing, high voltage generation is prohibited. If this connection is opened during operation, the
output voltages are switched off without a ramp.
For the 48 channel modules the safety current loop is independently from the SRTN contact only to be supplied through the
SL-socket. Deactivating the safety current loop by placing the “SL-disable” jumper ( Figure 1: Jumper configuration on back side)
does not deactivates the SRTN-mechanism.
EHS High Voltage Power Supply series | Last changed on: 2022-03-14 |
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