Specifications

12
1-800-927-9474
20-12
Three Phase MegaPAC Interface Connections (cont)
Overtemperature Shutdown
If the inlet ambient air temperature exceeds the following factory set levels, then all outputs are
disabled. For standard units the shutdown trip point is between 70˚C to 81˚C. The recovery
point is 10˚C lower than the actual trip point.
Auxiliary Vcc (J10-16,17)
J10 pins 16 and 17 provide an auxiliary regulated power source. It is +5Vdc +/–5% with respect
to Signal Ground, and can supply 300 mA maximum. It is short circuit proof, but if shorted, all
outputs will shut down.
The Auxiliary Vcc can be used to provide a pull-up reference for the Power Good circuit on
ConverterPACs. In this case, Signal Ground on J10 must also be connected to Signal Ground on
J3-4 of the ConverterPAC Power Good connector.
Gate-In, Gate-Out (J10-13,25)
Gate-In and Gate-Out signals are used for paralleling Three Phase MegaPACs for high power
systems using a proprietary driver/booster technique that provides accurate current sharing between
units. One channel may be paralleled, i.e., one output voltage from unit #1 may be connected to
unit #2. The Three Phase MegaPAC #1 provides a signal from output slot #10 at J10-25, to slot #1
in the Three-Phase MegaPAC #2 at J10-13. These signals are referenced to Signal Ground on J10.
Use twisted pair 20-22 AWG wires. Do not separate the units by more than six feet.
Applications Manual
Figure 15.
Analog Temperature
and Overtemperature
Warning
J10
+
-
100
4.99K
Analog Temperature
+
-
Vref
+5V
Overtemperature Warning
4.99K
Signal Ground
4.99K
LM393
MC34074
100K
1, 2, 12, 15
4
3
Figure 16.
Auxiliary Vcc
78M05
Auxiliary Vcc
16, 17
0.1 µF
Signal Ground
J10
1, 2, 12, 15
+5V/300 mA
Figure 17.
Gate-In and Gate-Out
J10
Gate Out
0.01 µF
1 kV
25
Signal Ground
J10
Gate In
1, 2, 12, 15
1, 2, 12, 15
13
Use 20-22 AWG Twisted Pair Wires
3-Phase MegaPAC #1
Slot 10
3-Phase MegaPAC #2
Slot 1