Section 3: Series 3700A cards power usage
Series 3700A Switch and Control Cards Reference Manual
3-6
3700AS-909-01 Rev. B / December 2011
Example 4
This example is for a fully loaded Model 3706A-S with a mix of cards.
Slot #
Card
Channel relays closed
Backplane relays closed
Slot 1
3720
20
2
Slot 2
3721
20
2
Slot 3
3722
15 (2-pole)
4
Slot 4
3723
25 (HI current)
2
Slot 5
3730
10
4
Slot 6
3740
2
4
This produces the following power consumption:
Slot 1 power consumed =
975
+
0
+
2 x 100
=
1175
Slot 2 power consumed =
1350
+
0
+
2 x 100
=
1550
Slot 3 power consumed =
475
+
0
+
4 x 100
=
875
Slot 4 power consumed =
700
+
25 x 100
+
2 x 100
=
3400
Slot 5 power consumed =
780
+
0
+
4 x 100
=
1180
Slot 6 power consumed =
1000
+
2 x 200
+
4 x 100
=
1800
Totals for each bank are calculated:
Slot 1
Slot 2
Slot 3
Total
Bank #1 power consumed =
1175
+
1550
+ 875
=
3600
Slot 4
Slot 5
Slot 6
Total
Bank #2 power consumed =
3400
+
1180
+ 1800
=
6380
NOTE
Since each bank did not exceed the maximum power, the power budget is within the limits.
Example 5
This example demonstrates how to calculate the card power of the 3750.
Setup Power
Notes
3300
Static power required of card under default
conditions (that is, all functions enabled)
CH 1,2,3 set as INPUT
0
CH 4 set as OUTPUT
365
CH 5 set as OUTPUT
365
CH 10 = V mode
470
CH 11 = I mode
470
Total Power
4970 mW
NOTE
:
Since total power per bank cannot
exceed 12300 mW, only two 3750
cards per bank can be populated when
used in the example configuration.
This leaves spare power (12300 –
(4970 * 2)) for controlling relays on a
third card in the bank.