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Power Good Inverted (J2-2 / P2-2)
This is the inverse of the Power Good signal and is referenced to Signal Ground on J2-1 / P2-1.
Signal Ground (J1-1 / P2-1)
Signal Ground on J2-1/P2-1 is an isolated secondary ground reference for J2/P2 status signals. It is used
to provide a reference point for the Power Good circuitry and is not the same as Earth Ground on input
power connector J9.
VCC IN (J2-4 / P2-4)
The VCC IN on J2-4/P2-4 is an input that re5V either from the J10 Auxiliary VCC, or from
another source. Input current to this pin is limited by an internal resistor to 3mA. If the J10 Auxiliary
VCC is connected to VCC IN on J2-4/P2-4, then the J10 Signal Ground must be connected to Signal
Ground on J2-1/P2-1.
+Sense / –Sense - J2-6 and J2-7 (See Pages 11 and 12 for information on Autosense)
The +Sense on J2-7 should be connected to the +Power Out, and the –Sense on J2-7 to the
–Power Out terminal. Do not reverse or leave the Sense pins open. Sense pins can be terminated locally
at the output of the power supply, in which case the power supply will provide regulation at the output
terminals. The voltage appearing at the load may drop slightly due to voltage drop in the power cables.
If it is necessary to compensate for voltage drop along the output power cables, this termination should
be made close to the output load. Compensation of up to 0.5V (0.25V per lead) can be obtained. Use
twisted pair 22-24AWG wire for this purpose.
For DualQPACs™, the +Sense pins are available on connectors designated as J2A-2 and J2B-2 for
outputs A and B, respectively. –Sense pins are on J1A-3 and J1B-3, respectively. These pins are also
duplicated on the power connectors J1A and J1B.
Reminder:
Only units with Autosense will automatically operate in Local Sense mode if no Sense
connections are made. It will operate in Remote Sense mode if Remote Sense connections are made.
Units without Autosense MUST have sense connections (Local or Remote) terminated to their respective
output for the unit to operate properly. Further, NEVER disconnect the +Out and –Out load wires while
the supply is operating as disconnecting WILL cause damage to the power supply.
Figure 10
Sense Leads
(Remote Sense)
Load
(Local Sense)
+P +Out
P2-7 +Sense
P2-6 –Sense
-P –Out
Use 22-24AWG
Twisted Pair Wires
