2-12
HSMSERIES OPR 052912
2.7.7
SIGNAL CONNECTIONS
The I/O Signal Connector, located on the rear panel of the HSM power supply (see Figure 2-2),
provides access for all programming inputs and status signal outputs. These signals provide
the user access to portions of the regulation control circuitry of the HSM and, as such, must be
protected from radiated and conducted noise as well as from physical contact with non-valid
driving sources. The following subsections address specific programming signal applications; in
general, however, when accessing this connector from distant locations or high-noise environ-
ments, it is recommended that a shielded cable be used, with the shield terminated to the sys-
tem's single point ground.
a)
Remote Error Sense
Twist positive and negative error sensing lines (pins 37, 19) together, especially when a sig-
nificant distance separates the power supply and load.
b)
External Voltage Programming (Voltage or Current)
Twist the programming signal line(s) (pins 18, 15, or both 18 and 15) with negative error
sensing line (pin 19); use shielded cable if possible.
c)
External Resistance Programming (Voltage)
Twist both programming lines (pins 17, 35) together; use shielded cable if possible.
d)
Remote Inhibit Controls (RC1, RC2)
Twist either (or both) programming lines (pins 7, 8) together with AUXRTN (pin 25); if 5VAUX
is used to power the external inhibit control circuitry, include 5VAUX line (pin 26) in twist.
Summary of Contents for HSM 12-84
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