SP Scientific RS Series, Operator'S Manual

Page: 49 / 60

RS44XX2MCT Chiller RS-232 Communications
Rev 004, 04/12 41
© SP Scientific 2012
Alarm Codes
Numeric codes are returned to the query ALMCODE? per the following alarm
conditions. Alarms, once set, are maintained until explicitly cleared, even if the alarm
condition has been corrected.
MPC/EDC Code 0:

No outstanding alarm condition.
MPC/EDC Code 1:

Low fluid level in system.
MPC/EDC Code 2:

Low fluid flow in system (inadequate pressure in return line).
MPC Code 3:

EDC Code 6:

Insufficient cooling water in water-cooled system.
MPC Code 4:

Stage 1 Refrigeration is not powered, as determined by current sensors. This
failure can be due to [internal] overtemp cutouts, trip of a circuit breaker,
etc.
MPC Code 5:

Stage 2 Refrigeration is not powered. See Code 4.
MPC Code 6:

Pump is not powered. May be not powered, fuse may be blown, etc.
MPC Code 7:

System has been programmed for control from Remote sensor. Remote
sensor is open-circuit.
MPC Code 8:

EDC Code 3:

High temperature alarm. Process temperature exceeds ALARMH?
MPC Code 9:

EDC Code 4:

Low temperature alarm. Process temperature has fallen below ALARML?
MPC Code 10:

Same as MPC Code 4, for a single-stage (only one compressor) system.
MPC Code 11:

EDC Code 5:

Overtemp. Indicates activation of fail-safe [control-independent]
overtemperature safety device.
MPC Code 12:

4-20mA Alarm. Indicates disconnect of 4-20mA current source to remote
analog programming input, if such interface is specified.