Section 6 • Alarms And Trips Screen; Overview; Warnings; Inhibits - Emerson VILTER MicroVission Operation And Service Manual

Section 6 • Alarms and Trips

Overview

The Alarms and Trips screen provides the options to view
and adjust settings for compressor safety and alarm
settings.

Warnings

The MicroVission uses Warnings to notify the operator
of the parameters that might inhibit the compressor
when started. Warnings are monitored only when com-
pressor is not running. Unless other specified, Warnings
use alarm setpoints for detection and message genera-
tion. The Warning condition occurs when the value of
a parameter drops below or rises above the configured
alarm setpoint when the compressor is not running.
All warning messages can be collectively seen in a pop-
up window. This pop-up is displayed when a warning
condition is present and the bottom status bar is pressed.
When the warning condition earlier present is cleared or
not anymore present, the corresponding warning mes-
sage will be automatically removed from bottom status
bar.
Warnings are shown in an Orange color
banner on the bottom status bar

Inhibits

The MicroVission uses start Inhibits to prevent the com-
pressor from starting to protect the compressor and the
refrigeration system. Inhibits are only active during Pre-
Start condition. While starting the compressor, inhibits
are checked first before the motor is started. Failed start
due to an inhibit do not count toward any of the anti-re-
cycle timer including Hot Starts. Unless other specified,
inhibits use alarm setpoints to abort compressor start
and message generation. The Inhibit condition occurs if
the value of a parameter drops below or rises above the
configured alarm setpoint during the compressor start.
Inhibits are shown in a Red color banner
on the top and bottom status bars
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3

Alarms

The MicroVission uses Alarms to notify the operator of
running parameters that if left unchecked could result in
the compressor shutting down due to a trip. Alarms are
only active when compressor is running. The Alarm con-
dition occurs if the value of a parameter drops below or
rises above the configured Alarm setpoint for a continu-
ous delay time (default 5 seconds).
Alarms are shown in a Yellow color banner
on the top and the bottom status bars

Trips

Trips are the conditions that exceed the safety limits of
the compressor or refrigeration system and stops the
compressor. Trips are only active when compressor is
running. The Trip condition occurs if the value of a pa-
rameter drops below or rises above the configured Trip
setpoint for continuous delay time (default 5 seconds).
During Trip condition, compressor run mode will get
changed to idle from running.
Trips are shown in a Red color banner on
the top and bottom status bars
When more than one safety condition is active/
present, Safety message for each condition (Except
Warning) will get displayed on Top Status Bar in
rotating manner.

Freeze Screens

Trips also trigger the input/output screen to take snap-
shot of all input and output values as Freeze 1 screen.
The Freeze screens are very useful as a troubleshooting
tool for the operator. Refer to Input/Output States sec-
tion for a typical Freeze Data (Trip) screen.
Logging – Event List
All Inhibits, Alarm and Trip conditions are logged in the
Event List so the operator can get the complete opera-
tional history. The operator can access the Event List
from the Menu screen.
NOTE
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