Specifications

12
1-800-927-9474
20-7
Autoranging MegaPAC/Mini MegaPAC Interface Connections
An output Enable/Disable function is provided by using an optocoupler to control the Gate In
pins of the ConverterPAC assemblies. If the Enable/Disable control pin is pulled low, the
optocoupler turns on, pulling the Gate In pin low and disabling the ConverterPAC output. The
nominal delay associated for an output to come up when measured from release of the
Enable/Disable pin is 5-10 ms. The General Shutdown function controls all outputs
simultaneously, and works in a similar manner.
The ride-through (holdup) time is the amount of time the load can be supported before loss of
output regulation after the loss of input power. Detecting the loss of input power takes a finite
time period after which the AC Power OK signal goes from a TTL “1” to “0”. This signal is
available for use within 1.2 seconds after initial power-up and may be used to indicate an
impending loss of power. Approximately 3 ms of warning time is obtained. Following the loss
of input power, the outputs are disabled after AC Power OK goes low.
Chassis Input Power Terminals (J9)
Input AC power is applied to terminal block J9, using a pressure screw terminal that accepts a
maximum wire size of 10 AWG. The maximum torque recommended is 10 in-lbs. J9-1 (GND)
is Earth Ground for safety; J9-2 (L2) is the Hot connection; J9-3 (L1/N) is the other Hot or input
Neutral connection.
A fault clearing device such as a fuse is required per safety agency conditions of acceptability. It
should be sized to handle the specific load conditions. The Autoranging MegaPAC should use a
max. 30A fast-blow fuse for 1200W, 115Vac operation and a max. 25A fast-blow fuse for
1600W, 230Vac operation. The Mini MegaPAC should use a 25A max. fast blow fuse. For
current ratings less than 6A, use a 3AB slow-blow type fuse. Fuses should be sized with
sufficient voltage rating as well as current rating.
Signal Ground (J10-10)
Signal Ground on J10-10 is an isolated secondary ground reference for all J10 interfacing
signals, and for ModuPAC output status signals such as Power Good. This is not the same as
Earth Ground on input power connector J9.
Enable/Disable (J10-1 to 8)
The Enable/Disable control pins allow ConverterPAC outputs to be sequenced either on or off.
For the Autoranging MegaPAC, J10-1 through J10-8 are the control pins for output positions 1
through 8, respectively. For the Mini MegaPAC, J10-1 through J10-5 control the outputs for
position 1 through 5. For DualPACs, both outputs are sequenced together. In parallel arrays,
only the driver ModuPAC need be controlled. The Enable/Disable pins should be pulled low to
less than 0.7V with respect to Signal Ground to disable the outputs. They will source 10 mA
maximum. These pins should be open circuited or allowed to exceed 4.5V when enabled. Do
not apply more than 8V to these inputs at any time.
MegaPAC/Mini MegaPAC
3
2
1
Input: Autoranging
90-132, or 180-264Vac, 47-500 Hz
or 260-380Vdc (optional, consult factory)
L1/N (or DC–)
L2 (or DC+)
F1
L1/N
L2
Earth Ground
Input Power
Terminal Block
J9
Note: An input fault clearing device, such as fuse F1 or a circuit breaker is recommended.
Figure 9.
Input Power
Connections
MegaPAC™ Family AC-DC, DC-DC Switchers