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PCHS/TPCHS SERIES Quick-Set PowerCassette®
INSTALLATION & OPERATING MANUAL
Manual No. tpchs-2
pchs-tpchs-man-rev2-1214.indd
16.0 DESCRIPTION OF CONTROL AND SUPERVISORY SIGNALS
The pin numbers shown below refer to the Positronics connector on the PCHS or TPCHS unit.
For the corresponding rack pin numbers, see Section 15 and Figures 10 and 11.
SIGNAL
PINS
DESCRIPTION
Signal Ground
22
This is the reference common for the Enable, Global Inhibit,
Input Power Fail, Output Power Good and Current Share signals.
Standby Supply
26
This is a +5VDC auxiliary output at 250 mA for powering
external control or other circuits. The return is the Signal
Ground, Pin 22. This output is not controlled by the Enable or
Global Inhibit inputs.
Enable
27
A logic LO or short to Pin 22 enables (turns on) the unit. A HI
or open inhibits (turns off) the unit. This input is referenced to
Signal Ground, Pin 22.
This pin must be activated to a logic
LO or short for the PowerCassette to operate.
This input is
the inverse of the Global Inhibit pin.
External Trim 29 & 32
These are the connections for V1 and V2 external trims,
respectively. The voltages can be adjusted over a ±5% range
from nominal using the external ciruits shown in Figure 6.
± Sense
30 & 31
33 & 34
36 & 37
These remote sense leads for V1, V2 and V3, respectively,
should be connected as twisted pairs to the respVe and
-Ve load points to provide regulation at the points of load. The
correct polarities must be maintained.
Current Share
35
41
44
These are analog control signs for V1, V2 and V3, respectively.
They are used to connect to the same pins of another identical
PowerCassette to share output currents. Output currents between
units are shared within an accuracy of 10% of full load current
over a 50% to 100% load range. This signal is referenced to
Signal Ground, Pin 22.
Output Power Good
38
A logic HI indicates that the unit is operating properly with
output voltages in their controllable ranges. A logic LO indicates
output failure. This signal monitors the V1, V2 and V3 outputs
only. The equivalent circuit is an NPN transistor collector with
a 10K ohm resistor to +5V. This signal is referenced to Signal
Ground, Pin 22.
Global Inhibit
39
A logic LO or short to Pin 22 turns off all outputs but not the 5V
standby supply or the fans; a logic HI or open at this pin turns
on all outputs. A 10k ohm resistor should be connected from this
pin to the +5V Standby output, Pin 26.This is the inverse of the
Enable pin.
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