GE Masoneilan SVI II ESD Installation And Maintenance Manual page 79

SIGNAL
POS (Position)
An exclamation point (!) appears in the display's top left corner to indicate that further
instrument status is available.
Powering Up the DSD Configuration
The DSD, or Discrete Safety Demand, configuration uses a 24 VDC power source.
To power up the DSD configuration of the SVI II ESD:
1. Loosen the four (4) cover screws and remove the cover of the SVI II ESD.
2. Connect the +⁄- terminals of the 24 VDC power source to the 24 VDC ESD IN connector (on
the terminal board). The voltage + must connect to the terminal board connector +, and
the same for -. See Figure 55 on page 82.
3. Reinstall the cover and display.
4. Turn on the voltage source. On initial power up, of a newly installed SVI II ESD, the PST
controller runs in SETUP mode using the default instrument parameters installed at the
factory. Once calibrated and configured and set to NORMAL, the PST controller cycles
through the NORMAL cycle menu and the following values appear:
PRES: Pressure - unit of measurement and value
SIGNAL
POS (Position)
An exclamation point (!) appears in the display's top left corner to indicate that further
instrument status is available.
Powering Up the A/DSD Configuration
The A/DSD, or Analog/Discrete Safety Demand, configuration uses both a 4 - 20 mA current
source (for the unit) and a 24 VDC source (for the safety trip) for power.
To power up the SVI II ESD:
1. Loosen the four (4) cover screws and remove the cover of the SVI II ESD.
2. Connect the +⁄- terminals of the current source to the 4 - 20 mA IN connector (on the
terminal board). The current source + must connect to the terminal board connector +,
and the same for -. See Figure 53 on page 76.
3. Reinstall the cover and display.
4. Adjust current to 20 mA.
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Use of a low impedance voltage source damages the SVI II ESD.
CAUTION
The current source must be a true high impedance current limiting
device. A proper current source explicitly enables adjustment of
the current in mA, not Volts.
Masoneilan SVI II ESD Installation and Maintenance Manual
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