Startup; Overview; Startup Tasks; Power-Up Sequence - Honeywell SMV800 SmartLine User Manual

8.1 Overview

This section identifies typical start up tasks associated with several generic pressure measurement
applications. It also includes the procedure for running an optional analog output check.

8.1.1 Startup Tasks

After completing the installation and configuration tasks for a transmitter, you are ready to start up
the process loop. Startup usually includes:
•
Short temperature sensor input terminals based on wiring diagram
•
Checking zero input
•
Reading inputs and outputs
•
Applying process pressure to the transmitter.
•
Connect actual temperature sensor inputs
You can also run an optional output check to wring out an analog loop and check out individual
Process Variable (PV) outputs in Digitally Enhanced (DE) mode before startup.
The actual steps in a startup procedure vary based on the type of transmitter and the measurement
application. In general, the procedures in this section are based on using Honeywell SmartLine
Versatilis Modem and application for HART and DE transmitters and Modbus host/EPKS
HS/RTU 2020 for a Modbus transmitter to check the transmitter input and output under static
process conditions and adjust as required initiating full operation with the running process.
Note: checks can be made using the optional three-button assembly, if your transmitter is so
equipped. Operation with the three-button assembly is discussed in the "Operation" section of this
manual.

8.1.2 Power-up Sequence

NOTE: The following procedure is not applicable for Modbus transmitter.
The SMV800 device power-up sequence in Analog mode (with loop current mode Enabled) as
measured across the 250 Ohm loop resistor and/or the TEST terminals:
•
Output starts at 0.90 volts for about 3 seconds (loop current of 3.6 mA)
•
Output steps to 3.00 volts (loop current of 12 mA)
•
Output steps to true value with respect to applied input and configured span
Note: while checking the proper supply voltage VCC at the communication board,
communication module sets the loop current to lower burnout. After reading the VCC,
communication module will again set the loop current to normal power up current
The SMV800 device power-up sequence (with the loop current mode Disabled) as measured
across the 250 Ohm loop resistor and/or the TEST terminals:
•
The device skips all initializations and goes directly to the fixed 1 volt (loop current of 4 ma).
For Modbus protocol device, after power up device takes about 20 seconds to start responding to
Modbus requests.
Revision 10

8 Startup

SMV800 Transmitter User's Manual
Page 29