µRack
Cod. CAREL +03P220431 rel. 0.0 del 08/09/05 - preliminary version
32
R/W 43 Type of fan control “r21”
R/W 44 Integral time for P+I fan control “r22”
R/W 45 Time between 2 fans starts in dead band “r23”
R/W 46 Time between 2 fans stops in dead band “r24”
R/W 47 Inverter speed up time “r27”
R/W 48 Inverter ramp up time “r28”
R/W 49 Minimum inverter output % “r29”
R/W 50 Maximum inverter output % “r30”
R/W 51 Triac impulse duration “r31”
R/W 52 High suction pressure 1 alarm delay “A02”
R/W 53 Low suction pressure 1 alarm delay “A04”
R/W 54 High suction pressure 2 alarm delay “A06”
R/W 55 Low suction pressure 2 alarm delay “A08”
R/W 56 Low discharge pressure alarm delay “A11”
R/W 57 Compressor thermal overload alarm delay “A12”
R/W 58 Prevent time in which no compressor starts are enabled “A13”
R/W 59 Prevent time in which the activation signals the alarm “A14”
R/W 60 Time to reset prevent alarm “A15”
R/W 61 Alarm signal delay “A20”
R/W 62 Time to change low pressure alarm from automatic to manual “A21”
15. Default configurations
Signal type of analogue inputs description
B1 analogue input 1 Discharge pressure probe
B2 analogue input 2 Ambient air temperature probe
B3 analogue input 3 Outside air temperature probe
B4 analogue input 4 Suction pressure probe
Signal type of analogue outputs description
Y PWM analogue output Fan inverter
Signal type of digital inputs Description
ID1 N.C. digital input no. 1 Comp. 1 thermal overload
ID2 N.C. digital input no. 2 Comp. 2 thermal overload
ID3 N.C. digital input no. 3 Fan 1 thermal overload
ID4 N.C. digital input no. 4 Fan 2 thermal overload
ID5 N.C. digital input no. 5 General high pressure switch
Signal type of digital outputs Description
NO1 normally open contact, relay no. 1 Compressor 1
NO2 normally open contact, relay no. 2 Compressor 2
NO3 normally open contact, relay no. 3 Fan 1
NO4 normally open contact, relay no. 4 Fan 2
NO5 normally open contact, relay no. 5 Generic alarm
16. Glossary
Analogue value: integer value with minus sign and decimal point.
Buffer (memory): memory on the board used to save the default values selected by CAREL for all the parameters. Permanent memory, saves the values even when
power is disconnected.
Buzzer: buzzer fitted on the external terminals; this sounds in the event of alarms or the limits set for the parameters are exceeded. The Built-in terminals do not
have a buzzer.
Digital value: value with only two states.
Differential: defines a pressure (or temperature) difference from the corresponding set point.
Discharge: pressure or temperature measured at the compressor outlet. This is an analogue value.
HP : High pressure
Integer value: integer value without decimal point.
LP : Low pressure
Proportional band: this defines a temperature (or pressure) zone of a few degrees starting from the set point, inside which the system manages the control devices.
Range: range of values available for a parameter.
Step: defines an area of the proportional band (pressure or temperature) inside which a device is on, and at the same time also defines the device on/off values.
Set point: defines a pressure (or temperature) value to be satisfied; the system activates or deactivates the devices so that the value measured reaches the set point.
Suction: pressure or temperature measured at the compressor intake. This is an analogue value.
Upload: the operation used to copy the application software from the computer or programming key to the Rack.
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