Vicor 4kW MegaPAC AC-DC Switchers - Manual (Page 20)

UG:107 vicorpower.com Applications Engineering: 800 927.9474 Page 20
Interface Connections (Cont.)
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 30A due to the loss of an input phase or severe line imbalance. This occurs when
one input phase is lost with approximately 1400W 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 0V and 10V 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.
Gate IN/Gate OUT (J10-13, 25)
The 3 Phase MegaPAC and 4kW MegaPAC can be paralleled with other 3 Phase
MegaPACs and 4kW MegaPACs respectively to increase output power. The Gate Out
(or PC) pin of the ConverterPAC in slot #10 is available on J10-25, and can be used to
provide input to the Gate In (or PC) pin of the ConverterPAC in slot #1 of a different 3
Phase MegaPAC or 4kW MegaPAC. The ConverterPAC in slot #1 of the second chassis
must be a booster, and additional boosters can be connected in parallel to it. The
ConverterPAC in slot #10 of the first 3 Phase MegaPAC or the 4kW MegaPAC must be
either a driver or a booster in a parallel array. ConverterPACs paralleled from chassis to
chassis must be of the same type, voltage, and power.
The 3 Phase MegaPAC and 4kW MegaPAC are configured at the factory to allow box-
to-box paralleling using the ConverterPACs originally shipped in the chassis. Since the
MegaPAC is a field configurable supply, the proper configuration must be verified before
paralleling from chassis to chassis. The last two digits of the 4kW MegaPAC part number
will identify whether slot #1 and slot #10 were configured for use with VI-200/VI-J00 or
Maxi ConverterPACs.
Using the example of MX7-410108-32, the last two digits, "-32," identify the type of
module in slot #1 and slot #10, respectively. A "3" indicates the chassis is configured to
parallel box-to-box using a Maxi converter. A "2" indicates the chassis is configured to
parallel box-to-box using a VI-200 converter. The above example shows the chassis is
configured for a Maxi converter in slot #1 and a VI-200 converter in slot #10.
When connecting multiple chassis in parallel, the signal ground on J10 of each chassis
should be tied together. Chassis outputs should be tied together near the power supply
and then cabled to the load. Using separate cables to provide power to the load will limit
the supplies' ability to current share properly.