Service manual

B - 99
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Appendix B • Vission 20/20 Application Procedures
N77:21 41361 Discharge Press. Control
# of Setpoints
INT Read
NOTES
• Analog Outputs: spare1 / spare2 / spare3 – send a fl oating point value between 4.0 and 20.0 to drive a 4-20 mA
signal output (assumes proper calibration)
• Statuses: Alarm Status Word(s) – currently only 17 alarms, so only Alarm Status Word 1 and 2 are used, with each
position indicating an alarm (MSB to LSB [Bit 15, Bit 14, Bit 13, ... Bit 3, Bit 2, Bit 1, Bit 0]):
Word 1 Word 2
Bit 0 = Low Oil Pressure Alarm Bit 0 = High Oil Separator
Temp. Alarm
Bit 1 = Add Oil to the middle sight glass Bit 1 = Unused
Bit 2 = Low Oil Injection Temp. Alarm Bit 2 = Unused
Bit 3 = High Filter Differential Alarm Bit 3 = Unused
Bit 4 = Low Suction Temp. Alarm Bit 4 = Unused
Bit 5 = High Discharge Temp. Alarm Bit 5 = Unused
Bit 6 = Low Suction Pressure Alarm Bit 6 = Unused
Bit 7 = High Discharge Pressure Alarm Bit 7 = Unused
Bit 8 = High Process Temp. Alarm Bit 8 = Unused
Bit 9 = Low Process Temp. Alarm Bit 9 = Unused
Bit 10 = Low Oil Separator Temp. Alarm Bit 10 = Unused
Bit 11 = High Oil Injection Temp. Alarm Bit 11 = Unused
Bit 12 = High Motor Current Alarm Bit 12 = Unused
Bit 13 = Remote Comm Time-out Bit 13 = Unused
Bit 14 = High Superheat Run Temp. Alarm Bit 14 = Unused
Bit 15 = Low Run Pressure Ratio Alarm Bit 15 = Unused
• Commands: Start Command – starts the compressor in the currently active control mode. If anti-recycle time
exists, this command will fail
• Compressor Scheduling: Enable/Disable – if a valid schedule has not been defi ned (on screen or through comm),
this command will fail
• Compressor Scheduling: Control Mode ENUM – 0 = Unscheduled
When enabling the schedule, allow for a timeout of at least 3 seconds for the schedule to be verifi ed as valid.
1 = Suction Pressure SP1
2 = Suction Pressure SP2
3 = Process Temp. SP1
4 = Process Temp. SP2
5 = Discharge Pressure SP1
6 = Discharge Pressure SP2