Operator`s manual

Pg. 12 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 978-749-3524 or -3525 Rev. 1/99
3 Phase MegaPAC Owner’s Manual
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 out-
put 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 shut-
down 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 SignalGround, provides an analog DC voltage output between 0V and 10V that
represents the air temperature of 0°C to 100°C respectively inside the power supply. The inlet air temperataure is
monitored close to the fan.
Gate IN/Gate OUT (J10-13, 25)
The Gate IN and Gate OUT signals are used for paralleling 3 Phase MegaPACs for power expansion. The Gate
OUT signal, J10-25, of the driver 3 Phase MegaPAC should be connected to the Gate IN, J10-13, of the Booster 3
Phase MegaPAC; J10 signal ground of the driver 3 Phase MegaPAC also needs to be connected to J10 signal
ground of the booster 3 Phase MegaPAC.
The driver 3 Phase MegaPAC (ModuPAC, slot #10) generates the Gate OUT signal and sends it to the booster 3
Phase MegaPAC (ModuPAC, slot #1). Vicor's zero-current-switching booster technology provides for accurate,
dynamic power sharing within arrays, without the need for trimming, module "matching" or external components.
Auxiliary Vcc +5V/0.3A (J10-16, 17)
The Vcc on J10-16, 17 is an auxiliary 5V regulated power source (see Figure 14 and Connector Pin Identification
of page 16). It is +5 Vdc +/–5% with respect to Signal Ground and can supply 300 mA maximum. It is short cir-
cuit proof, but if shorted all outputs will shut down through the Enable/Disable circuitry. The Auxiliary Vcc typi-
cally powers user circuitry or is used with the Power Good circuitry to provide a pull-up reference for the outputs
of the DC Power Good circuit on a ModuPAC. If used for this purpose, a J10 Signal Ground must also be connect-
ed to the J3-1 Signal Ground pin of the ModuPAC.
78M05
Auxiliary Vcc
16, 17
0.1 µF
J10
1, 2, 12, 15 Signal Ground
+5V/300 mA
Figure 14. Auxiliary Vcc