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3.7
Protection
During operation, the internal auxiliary supplies, overload of the high voltage sources, overtempera-
ture and interlock are monitored. In the event of a fault, the high voltage supplies are switched
off
; the
shutdown state is latched and displayed on LEDs.
A shutdown state can only be exited by means of a shutdown reset (push button
SDN Reset
on the
HAR42-4 front panel or signal
SDR (X1.1)
on connector
X1 INTERLOCK
set to +24V).
After power on the unit will be in shutdown state.
LED Function
Enable
on:
output stage is enabled by signal DISABLE=low
HV ok
on:
internal HV sources on, no overload
Interlock
on:
shutdown: interlock circuit open
blink: shutdown after interlock
Overload
on: overload
blink: shutdown due to overload
Overtemp
on: overtemperature
blink: shutdown due to overtemperature
3.8
Interlock / HV Off
The amplifier modules incorporate an interlock circuit through which the supply voltage of the high
voltage sources is switched.
The interlock signal is available via the rear connector
X1 INTERLOCK
on the subrack. The
HV off
palm button is looped into the interlock circuit. It is a closed circuit (break contacts). Its source voltage
is 24V
DC
.
To enable the high voltage generators
+24V_IL (X1.2)
and
IL (X1.3)
must be connected by a jumper or
a contact. The contact can be part of an external interlock circuit. The quiescent current is 30mA typ.
When the interlock circuit is closed and the
HV off
palm button is released, the palm button will be lit
to indicate that the high voltage sources are switched on.
The high voltage generation is not in operation until the
Interlock
shutdown state is cleared by
shutdown reset.
The device must be disconnected
from the power supply before
carrying out any operations on the
test setup or before touching the
output terminals.
