Agilent Technologies 4072A Advanced Pre-Installation Manual page 37

Figure 2-19 Block diagram of emergency off circuit (208 V option)
line
disconnect
device
line
(includes main breaker)
earth
emergency breaker
relay1
EMO detect
(green)
system
ext. cntrl
switch
ext.alarm 1:[NC]
ext.alarm 2:[NO]
Figure 2-20 Block diagram of emergency off circuit (220/240 V option)
line
disconnect
device
neutral
(includes main breaker)
earth
emergency breaker
relay1
EMO detect
(green)
system
switch ext. cntrl
ext.alarm 1:[NC]
ext.alarm 2:[NO]
Chapter 2
Agilent 4072/4073 Preinstallation Guide, Edition 4
main contactor
M
+ -
trans.
ac 24 V
relay4
relay7
OVT detect
EMO protector
relay5
relay6
relay2
relay3 +5 V
main contactor
M
+ -
trans.
ac 24 V
relay4
relay7
OVT detect
EMO protector
relay5
relay6
relay2
relay3 +5 V
Emergency Off (EMO) System
power outlet
protector
10 A
power outlet
protector
10 A
trans.
power outlet
protector
for 208 V
2 A x 2ea
fan protector
200 V
3 A
relay8
EMO panel
INSTRUMENT POWER
EMO SW LINE OFF SW
ON SW
white green
TH PS
start MASK
~20 sec
testhead fan
fan speed sensor
+ fan speed sensor
cabinet fan (3ea)
power outlet
protector
10 A
power outlet
protector
10 A
trans. for
220/240 V
fan protector
200 V
3 A
relay8
EMO panel
INSTRUMENT POWER
LINE OFF SW
EMO SW ON SW
white green
TH PS
start MASK
~20 sec
testhead fan
fan speed sensor
+
fan speed sensor
cabinet fan (3ea)
Site Preparation
instrument
power outlets
208 V
DVM and CMU
power outlets
220 V
controller
power outlets
220 V
instrument
power outlets
220/240 V
controller
power outlets
220/240 V
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