Section 7 • Alarms and Trips
Compressor Inhibits
The Vission 20/20 uses several start inhibits to prevent the compressor from starting to protect the compres- sor and the refrigeration system. While starting the compressor, the inhibits are checked first before the oil pump is started or the motor is started. The failed starts due to an inhibit does not count toward any of the anti- recycle timers including hot starts. The Inhibits uses the alarm setpoint to trigger an aborted start and message. All inhibits will be logged in the event list.
Safety Failure Messages
Low Suction Pressure Trip
•This message will appear when the suction pressure falls below the safety setting of the Low Suction Pres- sure Trip Setpoint No.1 or No. 2.
High Discharge Pressure Trip
•This message will appear when the discharge pres- sure exceeds the safety setting of the Hi Dsch Press Trip Setpoint No. 1 or No. 2.
Low Suction Temp Trip
•This message will appear when the suction tempera- ture falls below the safety setting of the Low Suction Temperature Trip setpoint.
High Discharge Temp Trip
•This message will appear when the discharge tem- perature rises above the safety setting of the High Discharge Temperature Trip setpoint.
Low Oil Separator Temp Trip
•This message will appear when the Oil Separator Temp is below the Low Oil Separator Start Temp Trip setpoint. In addition this message will appear after the Oil Separator Temp Safety Changeover timer times out and the Oil Separator temperature fails to rise above the Low Oil Separator Start Temp Reset af- ter the compressor is started.
Low Oil Separator Temp Trip
•This message will appear when the Oil Separator Temp is below the Low Oil Separator Run Temp Reset setpoint after the Oil Separator Temp Safety Changeover timer times out.
Low Process Temp Trip
•This message will appear when the Process Control Temperature falls below the safety setting of the Lo Control Temperature Trip Setpoint.
Prelube Oil Pump Inhibit
•This message will appear when the Prelube Oil Pressure (Manifold minus Discharge) has remained below the Prelube Oil Pressure Reset setpoint. The oil pump will try to generate “prelube pressure” for the time period of the Low Oil Pressure Safety Bypass timer setting.
Low Oil Pressure Trip
•This message will appear when the Running Oil Pressure (Manifold minus Suction) has remained be- low the low Oil Pressure Reset setpoint when the Oil Pressure Bypass Start timer times out. This message will also appear when the Running Oil Pressure falls below the Low Oil Pressure trip setpoint after the Low Oil Pressure Safety Bypass timer times out.
Low Oil Injection Temp Trip
•This message will appear when the Oil Injection tem- perature falls below the Low Oil Injection Temperature trip setpoint. This message will also appear when the Oil Injection temperature fails to rise above the Low Oil Injection Temperature reset setpoint after the Low Oil Injection Temp Bypass timer times out.
High Oil Injection Temp Trip
•This message will appear when the Oil Injection temperature rises above the High Oil Injection Temperature trip setpoint.
High Filter Differential Trip
•This message will appear if the Filter Differential Pressure rises above the High Fltr Diff Press – Start setpoint before the Filter Differential Pressure Safety Changeover timer times out.
High Filter Differential Trip
•This message will appear if the Filter Differential pressure rises above the High Fltr Diff Press Run setpoint after the Filter Differential Pressure Safety Changeover timer times out.
High Motor Current Trip
•This message will appear if the motor amperage rises above the Hi Motor Amps trip setpoint.
Compressor Interlock Trip
•This message will appear if the Motor Auxiliary con- tact fails to close before the Compressor Starter Auxiliary Contact Bypass timer times out. Refer to wiring diagram.
High Level Shutdown Trip
•This message will appear when power is removed from the input module that is designated as “Auxiliary #1 Safety” (please refer to your wiring diagram).
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153 | 7 – 3 |
