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PCHS/TPCHS SERIES Quick-Set PowerCassette®
INSTALLATION & OPERATING MANUAL
Manual No. tpchs-2
pchs-tpchs-man-rev2-1214.indd
SIGNAL
PINS
DESCRIPTION
Overtemperature
Warning
40
A logic LO at this output indicates an overtemperature condition
inside the unit. The LO occurs a few milliseconds before the unit
shuts down. The equivalent circuit is an NPN transistor collector
with a 10k ohm resistor to +5V. This signal is referenced to
Signal Ground, Pin 22.
Input Power Fail
42
A logic LO indicates the input power is present; a logic HI
indicates input power failure. The signal goes HI a minimum of
4 msec. before the outputs go out of regulation and stays HI for
4 msec. up to tens of msecs. The equivalent circuit is an NPN
transistor collector with a 10K ohm resistor to +5V. This signal
is referenced to Signal Ground, Pin 22.
17.0 INSTALLATION
17.1 Mounting.
The Quick-Set PowerCassette can either be mounted in the 19- inch rack (model
TPCHS) and secured by means of the jack screw or it can be mounted (model PCHS) on
another metal chassis by means of no. 4-40 screws into the four threaded inserts on either
the top or bottom of the unit. Maximum penetration is 3/16-inch. See Figure 4.
17.2 Input Power Connections.
AC input power connections are made to pins 45, 46 and 47 of
the large Positronics connector. A three-wire AC line cord should be used with the safety
ground connected to pin 45. DC input power connections are made to pins 48, 49 and 50
of the small Positronics connector. Again, a three-wire connection should be made with the
safety ground connection to pin 50. See Figure 5. When using a rack, AC connections are
made to either IEC60320 connectors or to terminal block connectors. DC rack connections
are made to terminal blocks. See Figures 10 and 11.
17.3 DC Output Connections.
The DC output connections for the PowerCassette are shown
in Figure 5. V1 and V2 outputs use multiple, paralleled pins on the Positronics connector,
namely pins 1 to 18. V3, V4 and V5 have a single pin for each output except that V4 and V5
returns are both on one pin. The returns should be separately run to their respective loads.
For the racks, V1 and V2 and their returns are to copper bus bars with no. 1/4-20 bolts for
connections. V3 output is to A1, A2 and A3 pins of P1, V4 is to pins 4 and 5 of P1 and V5
is to pins 9 and 10 of P1.
17.4 High Current V1 Output.
For units with V1 over 70 amps, that output actually consists of
the V1 and V2 outputs in parallel. In this mode the V1 and V2 output pins must be connected
to one another and the V1 and V2 current share pins must be connected to each other. The
V1 plus sense and minus sense pins must be connected to the V2 plus sense and minus sense
pins, respectively. All connections are external to unit.
17.5 Contact Resistance.
The connecting wires or lugs to the rack V1 and V2 bus bars should
be clean, and a tight, firm connection should be made with the bolts to minimize contact
resistance.
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