Vicor 4kW MegaPAC AC-DC Switchers - Manual (Page 19)

UG:107 vicorpower.com Applications Engineering: 800 927.9474 Page 19
Interface Connections (Cont.)
Enable/Disable Control of Maxi Module Arrays
When using the Enable/Disable function on an output that consists of two or more Maxi
modules, it is necessary to connect the E/D pins of the corresponding module locations
together such that both modules are commanded to turn ON or OFF simultaneously.
Example: Slots 1 through 6 have been configured as a single output parallel array
(see Fig. 6)
In order to disable this array, E/Ds 1 through 6 should be shorted together as shown in
Fig. 6. With the E/Ds connected together, a single switch can then be used to remotely
enable and disable the output.
**Note: For single output power supply configurations, the simplest method of remotely enabling and
disabling the output is to use the General Shutdown (GSD) function.
AC Power OK (J10-18)
This signal on J10-18 provides a status indication of the AC input power (see Figure 7).
It is active high, TTL compatible and capable of sourcing 10 mA maximum. This signal
switches to a TTL “1” when the high voltage bus exceeds low-line condition during turn-
on, and switches to a TTL “0” 3 ms (minimum) before loss of output regulation due to
the loss of input AC power. This signal can be used to warn external control circuits of
an impending loss of power.
Figure 6.
Enable/Disable Control
of Maxi Arrays
Figure 7.
AC OK/Power Fail
L1 L2 L3
14
1 2
15 16
3 4
17 18
5 6
19 20
7 8
21 22
9 10
23 24
11 12
25
13
1 2 3 4 5 6 7 8 10 9
10K
1, 2, 12,15 Signal Ground
19 AC Power Fail
+5V
J10
2.49K
2N2222
2.49K
2N2222
2N2222
14 Phase Fail
18 AC Power OK
4.99K