CAEN
Electronic Instrumentation
803x Series 8-16 Ch. Programmable HV Power Supplies
10
Channel control section
HV_EN/OFF/KILL 3 POS. SWITCH
Channel Enable and turning OFF/KILL
ON
RED LED
HV On enabled
REMOTE KILL
AMP 280370-2
The channel is KILLED either as the +/-
contacts are open or as a +4÷6Vdc voltage is
fed to
“
pin +
”, with “pin –“ to GND
(Channel
turned off at fastest available rate)
HV Status control section
ALARM
RED LED AMP 280371-2.
Out
Alarm status signalled (active LOW)
INTERLOCK
RED LED AMP 280371-2
In
Interlock signal
VMAX
trimmer
it allows to adjust the hardware maximum voltage VMAX common to
all the channels. Its value can be read out via software.
IMAX
trimmer
it allows to adjust the hardware maximum current IMAX common to
all the channels. Its value can be read out via software.
Alarm signal
As an Alarm condition is detected, pins 2 and 3 (- and +) are closed; the contact can be
used to switch an external device supplied by an external source, otherwise the VB and
GND references can be used to provide a TTL compatible level on pin 2 and 3.
In the first case (externally supplied device) the maximum allowed ratings are:
•
Maximum voltage b and -: 12V
•
Maximum sink current and -: 100mA
In the latter case, to produce a TTL compatible Alarm Out, pin 3 (+) must be
connected with pin 4 (VB) and pin 1 (GND) with pin 2 (-); see the diagram:
Interlock signal
A schematic diagram of the Interlock input is shown in the figure on the
left, where the diode is part of opto-coupler stage.
Interlock means that channels are hardware disabled. The following table
explains the interlock operation:
CONFIGURATION
INTERLOCK MODE
→
UNDRIVEN
DRIVEN
leave contact open
INTERLOCK
ENABLED
voltage level (0÷1V, ~5mA current) between pin 2 (high) and pin 3 (low) INTERLOCK
ENABLED
short circuit pin 1 with pin 2, and pin 3 with pin 4
ENABLED
INTERLOCK
voltage level (4÷6V, ~5mA current) between pin 2 (high) and pin 3 (low) ENABLED
INTERLOCK
The front panel Interlock LED is ON when the INTERLOCK is active; as INTERLOCK is active, channels are turned off at the fastest
available rate, regardless the RAMP DOWN setting. To reset the Interlock flag, all switches must be placed on KILL and then on OFF.
