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

UG:108 vicorpower.com Applications Engineering: 800 927.9474 Page 19
Interface Connections (Cont.)
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.
AC Power Fail (J10-19)
J10-19 is the inverse of AC Power OK, and goes to a TTL “1” when the input AC power is
not OK. It is capable of sourcing 10 mA maximum. The fan out is 20.
Phase Fail (Input Overcurrent) (J10-14)
J10-14 is a TTL level active-high signal that is asserted when the peak input current
reaches 30 A due to the loss of an input phase or severe line imbalance. This occurs
when one input phase is lost with approximately 1,400 W output loading. Maximum
current that can be sourced is 10 mA.
Overtemperature Warning (J10-3)
J10-3 is a signal that asserts a TTL level "1" if the air temperature exceeds the following
factory set levels. The warning trip point is 65°C to 76°C, typically, and recovery point is
60°C to 71°C, typically.
Overtemperature Shutdown
If the inlet ambient air temperature exceeds the following factory set levels, the outputs
are disabled. The shutdown trip point is 70°C to 81°C, typically, and recovery point is
40°C to 48°C, typically.
Analog Temperature Monitor (J10-4)
This signal on J10-4, referenced to Signal Ground, provides an analog DC voltage output
between 0 V and 10 V that represents the air temperature of 0°C to 100°C inside the
power supply. The inlet air temperature is monitored close to the fan.
Figure 7.
AC OK/Power Fail
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
End of Life - Not Recommended for New Designs