F
F
r
r
e
e
e
e
w
w
a
a
y
y
R
R
a
a
n
n
g
g
e
e
S
S
y
y
s
s
t
t
e
e
m
m
U
U
s
s
e
e
r
r
G
G
u
u
i
i
d
d
e
e
P
P
r
r
o
o
-
-
B
B
e
e
l
l
L
L
t
t
d
d
1
1
0
0
H
H
U
U
-
-
F
F
r
r
e
e
e
e
w
w
a
a
y
y
R
R
a
a
n
n
g
g
e
e
S
S
y
y
s
s
t
t
e
e
m
m
U
U
s
s
e
e
r
r
G
G
u
u
i
i
d
d
e
e
n
n
2
2
.
.
2
2
P
P
o
o
w
w
e
e
r
r
s
s
u
u
p
p
p
p
l
l
y
y
r
r
e
e
m
m
o
o
v
v
a
a
l
l
There are two power supply modules used for main and backup. For EMC and safety
reasons the mains, chassis and signal earths are permanently connected together
with the module.
A green LED on each PSU indicates the status of the power supply. PSU relay alarms
are also fitted.
The power supply modules are push fit into the frame and each secured by two
screws on the rear of the frame.
When replacing the power supply the following recommendations
must
be observed:
·
always disconnect the mains from the unit before removal or during repair
·
the securing screws should always be fitted before connecting the mains to
provide essential chassis earthing
Note: The
Freeway
PSU automatically adapts to the voltage range supplied. There is no
need to set a mains voltage selector position.
WARNING:
The screws form an essential chassis connection for
EMC compliance and must not be omitted
Power OK
Green LED
Power OK
Green LED
