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Output Switches
The SVI3 supports two identical contact outputs, SW #1 and SW #2 (Digital Output
switches), that can be logically linked to status bits.
The switches are polarity sensitive and must be connected only to a DC circuit. The switch
(+) terminal must be electrically positive with respect to the (–) terminal. If the (+) terminal is
electrically negative with respect to the (–) terminal, then the switch will conduct
,
regardless
of switch state
.
If the switch is connected directly across the power source, the current will be limited only
by the capacity of the power source and the switch can be damaged.
Without a load, when the switch is on (closed) the external voltage would be dropped
across the switch. This damages the switch (Figure 20).
Figure 20 Switch Installation Drawing without Load:
Configuration Not Allowed
General Configuration Notes
This section discusses the necessary precautions when configuring a system.
Switch OFF
Switch ON
V
SWITCH
30 VDC max.
1 V (Switch saturation voltage)
I
SWITCH
0.200
mA (Switch leakage cur
-
rent)
1 A max.
CAUTION
For IS Applications, Maximum Switch Current allowed is 125mA.
SVI3
+
+
External
Voltage Source
NOT
ALLOWED
REMOTE
PV
1-5Vdc
D/I
+ -
4-20mA OUT
+ -
1
SW #2
+ -
SW #1
+ -
2
3
+ -
REMOTE
PV
1-5Vdc
D/I
+ -
4-20mA OUT
+ -
1
SW #2
+ -
SW #1
+ -
2
3
+ -
