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CAEN
Electronic Instrumentation
Channel control section
HV Status control section
ALARM
INTERLOCK
VMAX
IMAX
Alarm signal
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
CONFIGURATION
leave contact open
voltage level (0÷1V, ~5mA current) between pin 2 (high) and pin 3 (low) INTERLOCK
short circuit pin 1 with pin 2, and pin 3 with pin 4
voltage level (4÷6V, ~5mA current) between pin 2 (high) and pin 3 (low) ENABLED
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.
803x Series 8-16 Ch. Programmable HV Power Supplies
HV_EN/OFF/KILL 3 POS. SWITCH Channel Enable and turning OFF/KILL
ON
REMOTE KILL
RED LED AMP 280371-2.
Out
RED LED AMP 280371-2
In
trimmer
trimmer
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 between + and -: 12V
•
Maximum sink current across + and -: 100mA
INTERLOCK MODE →
RED LED
HV On enabled
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)
Alarm status signalled (active LOW)
Interlock signal
it allows to adjust the hardware maximum voltage VMAX common to
all the channels. Its value can be read out via software.
it allows to adjust the hardware maximum current IMAX common to
all the channels. Its value can be read out via software.
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:
UNDRIVEN
INTERLOCK
ENABLED
DRIVEN
ENABLED
ENABLED
INTERLOCK
INTERLOCK
10
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