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10.4 Power Distribution
Figure 48 shows the power distribution on the Relay Card.
BACKPLANE
SLOT 0?6
20
+5 V
Multiplexer/
Latch
22
+V_USER
+12 V linear
regulator
Comparator
+12 V coil actuation
voltage
1, 25
Figure 48. Relay Card Power Distribution
The relay coil actuation voltage is 12 V, and so +V_USER should be 12 V to 30 V DC. The
+V_USER supply passes through a linear regulator and comparator, which are in parallel.
The comparator is set for approximately +13.9 V, and as long as +V_USER is more than
+13.9 V, the +12 V from the linear regulator will provide the coil actuation voltage.
Should +V_USER be less than +13.9 V, the comparator will supply +V_USER directly to
provide the coil actuation voltage.
120
Smart Star Relay Cards (SR9500)
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