Omron GRT1 - 11-2007 Operation Manual page 89

Digital I/O Units
Note
Rated Output Current of the GRT1-OD4G-3
68
With the GRT1-OD4G-1 or GRT1-OD4G-3, even if a short-circuit occurs on
one output, the other three outputs will operate normally.
The total power that may be delivered by the outputs of the GRT1-OD4G-3
depends on the ambient temperature. To determine the maximum allowed
temperature for an application, add the squares of the currents (at 24 V DC)
for outputs that can be ON simultaneously. Find the corresponding tempera-
ture in the following graph. The actual ambient temperature may not exceed
the found value.
If necessary, spread the output load over multiple GRT1-OD4G-3 Units.
Σ
18
2
I
16
14
12
10
8
6
4
2
0
0 10
Ambient
temperature
≤30 °C
16 A
35 °C
14 A
40 °C
11.5 A
45 °C
9 A
50 °C
6.5 A
55 °C
4 A
20 30
Examples of maximum output loads
Σ
2
I
4 points × 2 A
2
3 points × 2 A + 1 points × 1.4 A
2
4 points × 1.85 A
2 points × 2 A + 2 points × 1.3 A
2
4 points × 1.7 A
2 points × 2 A + 2 points × 0.7 A
2
4 points × 1.5 A
1 points × 2 A + 1 points × 1.4 A + 2 points × 0.5 A
2
4 points × 1.25 A
1 points × 2 A
2
4 points × 1 A
Section 4-6
40 50 60
Ambient temperature