DCA
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Figure 3.
STD DCA w/DPDT Option Terminal Locations
WARNING
To guard against accidental electric
shock, it is recommended that the protec-
tive plastic cover be re-installed over the
terminal strip of the STD DCA before
applying power to the calibration setup.
Figure 4 shows the labeling for a STD DCA equipped
with the DI Option. Note that both inputs share the “–
IN” terminal.
UPPER RELAY #1 NORMALLY
CLOSED — UNC1
+IN — CURRENT
OR VINPUT
-IN — CURRENT
OR VOLTAGE -INPUT
LNO1 — LOWER RELAY #1
NORMALLY OPEN
COM — COMMON
LNC1 — LOWER RELAY #1
NORMALLY CLOSED
LNO2 — LOWER RELAY #2
NORMALLY OPEN
COM — COMMON
LNC2 — LOWER RELAY #2
NORMALLY CLOSED
UNO2 — UPPER RELAY #2
NORMALLY OPEN
COM — COMMON
UNO2 — UPPER RELAY
#2 NORMALLY CLOSED
UPPER
LOWER
DC CURRENT
ALARM
DEADBAND
LOWER
UPPER
ZERO
COMMON — COM
ACC — –DC
AC — +DC
GND
UPPER RELAY #1 NORMALLY
OPEN — UNO1
OPTION — +TX FOR
TRANSMITTER EXCITATION,
+REF FOR DEVIATION ALARM
DCA
