Emerson Vission 20/20, Operation And Service Manual

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7 – 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 7 • Alarms and Trips
Overview
The Alarms and Trips screen allows the operator to view
and adjust settings for compressor safety and alarm set-
tings. For Alarms and Trips Screen Pages refer to Figures
7-1, 7-2, 7-3 and 7-4.
Vission 20/20 uses Alarms as a way to notify the opera-
tor of running parameters that if left unchecked could
result in the compressor shutting down due to a trip.
Trips are the conditions that exceed the safety limits of
the compressor or refrigeration system and stops the
compressor. Trips are always displayed as a red banner
and alarms are yellow banners on the top and bottoms
status bars.
Alarms and trip conditions are also logged to provide
an operational history for the operator. Both alarms
and trips will be logged in the event list accessible from
the menu screen. Trips also trigger the input/output
screen to take a snapshot of all input and output values
as freeze screen. The freeze screens are available as left
side tabs in the input/output screens and are very useful
as a troubleshooting tool for the operator.
The Vission 20/20 uses Warnings as a way to notify the
operator of parameters that may inhibit the compressor
when started. Warnings are monitored only when com-
pressor is not running. Warnings are always displayed
as a orange banner on bottom status bar. Warnings
uses the alarm setpoint for detection and message. All
warnings messages present can be seen collectively in a
pop-up window. This pop-up is displayed when warning
condition is present and bottom status bar used for dis-
playing warnings is pressed.
Alarms and Trips Setpoints
Reference Figure 7-1.
Low Suction Pressure (Alarm & Trip):
• This is the low suction pressure safety. This safety
is active in both temperature and pressure control
Figure 7-1. Alarms and Trips Screen - Page 1