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PCHS/TPCHS SERIES Quick-Set PowerCassette®
INSTALLATION & OPERATING MANUAL
Manual No. tpchs-2
pchs-tpchs-man-rev2-1214.indd
13.10 I²C Option.
This option provides an industry standard I²C serial data bus interface which
provides the status of system-critical operating parameters. This permits the montoring of
these parameters on demand by a host system or computer.
Three forms of data are available from the PowerCassette by means of its I²C capability:
inventory control information, operating status indication and system load data. Inventory
control information consists of model number, manufacturing part number, serial num-
ber, etc., to identify the specific PowerCassette. Operating status indicators include input
power fail, output power good, temperature warning and alarm, and fan good for each of
three cooling fans. System load data includes V1 to V3 output voltages and currents, and
internal temperature.
For further details on the I²C serial data bus, see Appendix 2.
14.0 PARALLEL OPERATION
14.1
Parallel Connection.
PowerCassettes can be operated in parallel by connecting their outputs
in parallel, connecting their V1, V2 and V3 current share terminals, respectively, together
(pins 35 together, pins 41 together and pins 44 together) and connecting the Signal Grounds
together (pins 22). The PowerCassette racks permit conveniently operating units in parallel
in either a redundant or non-redundant mode.
14.2 Redundant Operation.
Connecting two PowerCassettes in parallel, with or without the
compatible 19-inch rack, so that the full output load current can be carried by one unit
results in 1+1 redundant operation. While operating normally, the load current is shared
approximately equally between the two units. Should one PowerCasssette fail, or even if
one of its outputs fails, the full load is then maintained by the other unit. The failed unit can
then be replaced (hot-swap) without affecting the load current. This operation is facilitated
by the ORing diode on each output. In similiar fashion three PowerCassettes in parallel with
the full output load current carried by two of the units results in 2+1 redundant operation.
Redundancy with quick replacement of a failed unit results in virtually infinite MTBF.
14.3 Non-Redundant Operation.
Higher output load currents can be realized by operating
two units in the non-redundant mode to achieve 1200 watts output power . The units are
connected in parallel the same as before. In this case if one unit or one output fails, the load
will lose power since only part of the load current can now be supplied by the remaining
unit which will go into current limit. The failed unit can be quickly replaced without turning
the power off (hot-swap) to restore load current. In the 19-inch compatible racks there is a
limit of 1200 watts output for both the two- and three-unit versions. Three units therefore
cannot be operated in non-redundant mode.
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