Technical Specifications

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Output Switches (DO2)
The SVI II ESD supports two identical contact outputs which can be logically linked to status
bits. The two output switches can be opened or closed in response to conditions that the SVI II
ESD detects (only one switch is configurable for the ESD).
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.
There must be a series load in the circuit to prevent damage to the switch. 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.
These conditions are:
0. Always Normal Position The switch is not controlled by the SVI II ESD and remains in it’s
default position. The digital output switch can be opened or closed in
response to detected conditions. The default configuration setting is
Always Normal Position, where normal is closed, which means that
the switch will not switch for any valve travel. To activate the switch
at a given valve position, configure the switch Position Low Limit or
Position High Limit.
1. Failsafe The switch is activated when the SVI II ESD is in failsafe mode.
2. Reset The switch is activated whenever a reset has occurred and the
switch remains activated until the SVI II ESD status is cleared.
3. Position Error The switch is activated whenever a position error has occurred and is
deactivated when the position recovers to the correct position.
4. Tight Shutoff Active The switch is activated whenever the device is in tight shutoff (tight
shutoff is on and the valve position is less than the tight shutoff posi-
tion).
5. Position Low Limit The switch is activated whenever the valve position is less than the
position setting of this switch control.
CAUTION If both Position Low Limit and Tight Shut Off are used, the Position
Low Limit must be above the Tight Shut Off.
6. Position Upper Limit The switch is activated whenever the valve position is greater than
the position setting of this switch control.