Service manual

7 – 2
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 7 • Alarms and Trips
modes. An alarm or trip will be activated if the suc-
tion pressure falls below the setpoint values.
High Discharge Pressure (Alarm & Trip):
• This is the high discharge pressure safety. The alarm
or trip will be activated if the discharge pressure rises
above the setpoint value.
High Process Temperature (Alarm only)
• This alarm is active when the process temperature
is at or above the setpoint value. There is no trip
setpoint.
Low Process Temperature (Alarm & Trip):
• This is the low control temperature safety. This safety
is active when process temperature control has been
selected in the Control Mode dropdown selection
found in the Compressor Control screen. An alarm or
trip will be activated on a drop in process tempera-
ture below the setpoint value.
Reference Figure 7-2.
Low Suction Temperature (Alarm & Trip):
• This is the low suction temperature safety. The alarm
or trip will be activated if the suction temperature
drops below the setpoint value.
High Discharge Temperature (Alarm & Trip):
• This is the high discharge temperature safety. The
alarm or trip will be activated if the discharge tem-
perature rises above the setpoint value.
Low Oil Separator Start Temperature (Alarm & Trip):
• This is the starting low oil separator temperature
safety. The compressor is prevented from starting
or running if the oil in the separator is below the
alarm value. After a time delay (setting of the Oil
Separator Temperature Safety Changeover timer),
this safety is deactivated and the Low Oil Separator
Run Temperature alarm and safety setpoints become
active.
Low Oil Separator Run Temperature (Alarm & Trip):
• This is the running low oil separator temperature
Figure 7-2. Alarms and Trips Screen - Page 1 as Level 2 User