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10.2 User Interface
Depending on the model of Relay Card (see Table 20), the relays on the Relay Card will be
configured as SPDT or SPST with or without snubbers. Figure 45 shows these relay configura-
tions.
+V
COM
8
1
NO
NC
7
9
10
RELDRV
SPDT
(no snubbers)
COM
NO
100 nF
100 nF
47 W
47 W
8
7
9
1
10
+V
RELDRV
SPDT
(with snubbers)
NC
+V
COM
NO
100 nF
47 W
8
7
9
1
10
RELDRV
SPST
(with snubbers)
Figure 45. Relay Configurations
The diode protects the coil power supply (and the Smart Star backplane) from inductive
spikes caused by energizing/de-energizing the coil, and the resistor-capacitor snubbers
protect the relay contacts against voltage spikes induced by inductive loads.
Figure 46 shows the complete pinout for the user interface on header J1. Note that pin 1 is
indicated by a small arrow on the ribbon cable connector.
SR9500
J1
GND REL0NO
SR9510
J1
GND REL0NO
REL0NO
REL0COM
REL1NO
REL1COM
REL2NO
REL2COM
REL3NO
GND
REL3COM
REL4NO
REL4COM
GND
REL5NO
REL5COM
GND
REL0COM
GND
REL1NO
REL1COM
GND
REL2NO
REL2COM
REL3NO
REL3COM
REL4NO
REL4COM
REL5NO
REL5COM
REL5NC
REL5NC
REL0COM
REL1NO
REL1COM
REL2NO
REL2NC
REL3NO
REL3NC
GND
REL4NC
REL5COM
REL6NO
GND
REL7NO
REL7NC
GND
REL0NC
GND
REL1NC
REL2COM
GND
REL3COM
REL4NO
REL4COM
REL5NO
REL5NC
REL6COM
REL6NC
REL7COM
GND
Figure 46. Relay Card User Interface Pinout
118
Smart Star Relay Cards (SR9500)
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