Analog Inputs - ABB SM1000 User Manual
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- User manual (134 pages) ,
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...5 INSTALLATION
5.4 Analog Inputs
5.4.1 Current and Voltage – Fig. 5.6
Caution.
• When the 'Input type' is set to 'Voltage', inputs
must be connected through a 500kΩ voltage
divider (part no. GR2000/0375). Voltages up to 2V
can be measured without a divider, using the
milliVolt range.
• To avoid damage to multi-channel instruments, high
common mode voltages up to 500V r.m.s. max. must
be present on all channels, or not at all.
• The maximum channel-to-channel voltage (between
any two channels) must not exceed 12.5V (100V high
spec. inputs) or permanent damage to the instrument's
input circuitry may occur. To prevent such damage, link
the negative terminals on all inputs. For applications
where the available isolation is required, this link must not
be fitted.
5.4.2 Thermocouple – Fig. 5.6
Use the correct compensating cable between the thermocouple
and the terminals – see Table 5.1.
Automatic cold junction compensation (ACJC) is incorporated
but an independent cold (reference) junction may be used.
5.4.3 Resistance Thermometer (RTD) – Fig. 5.6
On applications requiring long leads it is preferable to use a
3-lead resistance thermometer.
If 2-lead resistance thermometers are used, each input must be
calibrated to take account of the lead resistance.
5.4.4 Transmitter Power Supply – Fig. 5.7
Information. The power supply board provides a 24V
supply capable of driving two 2-wire transmitters. Two
additional 24V power supplies are provided on the
transmitter power supply module boards, each of which is
capable of driving two 2-wire transmitters.
T
y
p
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f o
T
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m
o
c
o
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N
- i
C
/ r
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A -
( l
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B
o r
N
- i
r C
C /
- u
N
( i
) E
N
r c i
l i s i
N /
s i
( l i
) N
O
a r
P
/ t
t P
R -
h
R (
a
n
d
) S
W
t P
R -
/ h
t P
R -
h
(
) B
C
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C /
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W
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C /
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C /
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D (
N I
4
3
7
1
) 0
72
B
S
1
8
4
3
+
–
C
a
s
e
+
w
n
B
u l
e
R
e
d
Y
e
o l l
– –
n
g
e
B
u l
e
O
a r
n
g
e
O
a r
n
h
e t i
B
u l
e
G
r
e e
n
B
a l
– –
h
e t i
B
u l
e
B
u l
e
B
u l
o l l
w
B
u l
e
B
a l
k c
W
h
– –
Table 5.1 Thermocouple Compensating Cable
Voltage divider
(GR2000/0375)
required for
voltage inputs
A – Voltage
+
–
3rd
Lead
Each lead must be of equal
resistance and less than 10Ω
Caution. Under no circumstances must the
spare input terminal be linked to the negative.
Note. Refer also to Fig. 5.5 for terminal numbers.
Fig. 5.6 Analog Input Connections
Analog Input
+
–
Fig 5.7 Transmitter Power Supply
C
o
m
p
e
n
s
t a
n i
g
C
A
N
I S
M
C
9
6
1 .
–
C
a
s
e
+
w
R
e
d
Y
e
o l l
w
R
e
d
– –
g
e
R
e
d
O
a r
n
g
e
k c
R
e
d
G
r
e e
n
R
e
d
–
e
R
e
d
B
u l
e
R
e
d
e t i
R
e
d
B
a l
k c
R
e
d
– –
B
u l
/ e
e r
+
+
–
–
10Ω Resistor
supplied in
accessory pack.
B – Current
White
+
Red
–
Red
3rd
Lead
D – 3-lead RTD
2-wire Transmitter Power Supply
(24V d.c., 45mA max.)
–
+
Tx
+
–
10Ω Shunt
a
b
e l
D
N I
4
3
7
1
4
B
S
–
C
a
s
e
+
G
r
e e
n
G
r
e e
n
G
r
e e
n
– –
V
o i
t e l
– –
i P
k n
W
h
e t i
W
h
e t i
O
a r
n
g
e
–
G
r
y e
B
o r
w
n
B
o r
w
n
B
o r
w
n
B
u l
e
B
u l
e
B
a l
k c
*
C
a
e s
B
u l
e
f
r o
D
N I
4
3
7
1
0
d
B
u l
e
B
u l
e
+
C – Thermocouple
White
Red
Sleeved
Link
E – 2-lead RTD
(and resistance)
4
9
3
7
P
a
t r
N
o
3 .
0
–
C
a
s
e
*
W
h
e t i
G
r
e e
n
*
W
h
e t i
V
o i
t e l
*
W
h
e t i
i P
k n
*
W
h
e t i
O
a r
n
g
e
*
W
h
e t i
G
r
y e
*
W
h
e t i
B
o r
w
n
*
W
h
e t i
B
a l
k c
t n i
n i r
i s
a c
y l l
a s
e f
c
c r i
u
s t i
– –
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