Baker Hughes Masoneilan SVI II ESD, Быстрый старт

Страница: 43 / 100

© 2018 Baker Hughes, a GE company, LLC. All rights reserved. Masoneilan SVI II ESD Quick Start Guide =
|
43
Wiring a Position Retransmit
CAUTION
For proper operation, maintain signal po and - respectively.
To connect:
1. Strip the insulation at the end of the wires. Strip approximately 1/4” (6.35 mm) of
the insulation at the end of wires (wire size 14 to 28 AWG, 2.5 mm
2
to .08 mm
2
).
2. Connect the + ⁄ - terminals from the 4-20 mA Out to the position retransmit input
signal: + to + and - to -. See Figure 15 on page 49.
To troubleshoot retransmit connections:
Ensure that the retransmit circuit has a minimum voltage of 10 V (maximum
30 V).
3. Ensure the minimum AO current is 3.2 mA. If the module loses power and the AO
circuit remains powered, the AO signal will be 3.2 mA.
Compliance Voltage in Single Drop Current Mode
The SVI II ESD requires 9.6 Volts at 20 mA and 11.0 Volts at 4 mA. Typical HART
®
devices require
MORE Voltage at higher current and MORE current source have LESS Voltage available at higher
current. The SVI II ESD is unique in that it requires LESS Voltage at higher current which compli-
ments the characteristic of the source requiring only
9.6 Volts at 20 mA. See “Determining an SVI
Positioner Compliance Voltage in a Control System” on page 97.
NOTE Improperly or inadequately grounded installations can cause
noise or instability in the control loop. The internal electronic
components are isolated from ground. Grounding the case is
unnecessary for functional purposes but grounding the case may
be necessary to conform to local codes.