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Chapter 2
GuardLink System Design
26
The operating voltage specification of the tap is 20.4...26.4V. In the example
that is shown in
Table
supply voltage specification of 20.4V DC. This system is not feasible, and
remedial action must be taken (see
IMPORTANT
Table 4
• Supply voltage = 24V
• Link cable wire gauge = 18 AWG
• Link wire resistance = 0.0218 ohms/m
Table 4 - Voltage Calculation at 24V Supply
Cable Length
Tap
[m (ft)]
Safety Device
1
15 (49.2)
SensaGuard Ser A
2
15 (49.2)
SensaGuard Ser A
3
15 (49.2)
Lite Lock 440G-LZ
4
15 (49.2)
800F E-stop
5
15 (49.2)
LifeLine 4
6
15 (49.2)
LifeLine 5
7
15 (49.2)
TLSZR-GD2 PLe
8
15 (49.2)
TLSZR-GD2 PLe
9
15 (49.2)
Lite Lock 440G-LZ
10
15 (49.2)
SensaGuard Ser A
11
15 (49.2)
SensaGuard Ser A
12
15 (49.2)
Mechanical Switch
13
15 (49.2)
Mechanical Switch
14
0 (0)
15
0 (0)
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
4, the voltage at J1 of tap 6 has fallen below the lowest
Table
5).
assumes the following:
Tap + Device
Total Current
Current (mA)
81
81
135
40
40
81
135
135
135
81
81
40
40
—
0
—
0
J1 Voltage
J3 Voltage
(mA)
(V)
Typical (V)
1105
23.22
22.82
1024
22.49
22.09
943
21.82
21.42
808
21.25
20.85
768
20.70
20.30
728
20.19
19.79
647
19.73
19.33
512
19.36
18.96
377
19.10
18.70
242
18.92
18.52
161
18.81
18.41
80
18.75
18.35
40
18.73
18.33
0
—
—
0
—
—
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