User Connections and Considerations
41
Table 4-1. Analog Connector Functions
Pin Function
IP Series 654xA and 655xA
Current programming Input. Allows an external voltage source to program CC (constant current) mode.
CC is programmed with a 0 to -5 V signal that produces proportional output current from zero to full scale.
The IP input is also used for auto-parallel operation as described later in this chapter.
±IP
Series 657xA
Differential Current Programming Input. Allows an external voltage source to program CC (constant
current) mode. ±IP accepts a signal (see Analog Programming in Table 1-2b) that produces a proportional
output current from zero to full scale. +IP is positive with respect to -IP. -IP may be floated up to ±19 V from
the Common P (↓P) terminal, which is approximately at the same potential as the + output. The ±IP input is
also used for auto-parallel operation as described later in this chapter.
VP Voltage Programming Input. Allows an external voltage source to program CV (constant voltage) mode.
CV is programmed with a signal (see Analog Programming (IP & VP) in “Supplemental Characteristics”)
that produces a proportional output voltage from zero to full scale.
+IM Series 654xA and 655xA
Current Monitor Output. Monitors the output current with respect to Common P (↓P). A 0 to -5 V signal
at this output indicates a zero-to-full scale current. +IM is also used when connecting supplies in autoparallel
for increased current output (see “Auto-Parallel Operation”).
-IM Series 654xA and 655xA
Current Monitor Input. Connects to Common P (↓P) when connecting supplies in autoparallel for
increased current output (see “Auto-Parallel Operation”).
IM Series 657xA
Current Monitor Output. Monitors the output current with respect to Common P (↓P). A signal (see
Current Monitor (IM) in Table 1-2b) at this output indicates a zero-to-full scale current. +IM is also used
when connecting supplies in autoparallel for increased current output (see “Auto-Parallel Operation”).
Common P
(↓P)
Series 654xA and 655xA
Common Return. Provides the common connection for the IP and VP programming inputs and the +IM
current monitor output.
Common P
(↓P)
Series 657xA
Common Return. Provides the common connection for the VP programming input and the IM current
monitor output.
±S
Series 654xA and 655xA
Remote Sense Inputs. Connects the load sense input leads to the power supply when the rear panel Remote
Sense switch is in the Remote position (see “Remote Sensing” ).
±S
Series 657xA
Sense Inputs. Connects the power supply sense input to either the +LS and -LS terminals for local sensing
(see “Local Voltage Sensing”) or to the load for remote sensing (see “Remote Voltage Sensing”).
After you have finished making the analog connections, insert the plug back into the analog connector and replace the
output safety cover.
Wire Size Selection
The minimum wire size required to prevent wire overheating still may not be large enough to maintain a small enough load-
lead voltage drop for good electrical performance. See “Remote Sensing” and “OVP Considerations” for more information
on this topic. Table 4-2 gives the wire resistance for various stranded sizes to help you determine load-lead drop.
Fire Hazard To satisfy safety requirements, load wires must be heavy enough not to overheat when
carrying the maximum short-circuit current of the power supply.
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