Carel mRack - Semiautomatic Alarms; Alarm Relay; Alarms from Analogue Inputs: Temperature Probe and Pressure Transducer

µRack
Cod. CAREL +03P220431 rel. 0.0 del 08/09/05 - preliminary version
20
If, on the other hand, the cause of the alarms is still present, the initial situation will return.
7.3. Semiautomatic alarms
The low pressure alarm from transducer is a semiautomatic alarm. It acts as an alarm with automatic reset, however if it is activated at least 3 times within a set
time (default 10 minutes), it becomes an alarm that must be reset manually, that is, using parameter A19. This alarm obviously causes the unit to shutdown.
7.4. Alarm relay
Based on the configuration (no. of devices < 5) relay no. 5 (multifunction) can be used as an alarm relay.
A delay time can be set (parameter A20) between the activation of an alarm and the change in the status of the signal relay.
If the time is set to 0, the activation of the alarm relay is immediate.
Code Alarm description Generated by Action performed Type of reset Delay Notes
A01 Compressor 1 DIN Comp.1 OFF Settable Settable
A02 Compressor 2 DIN Comp.2 OFF Settable Settable
A03 Compressor 3 DIN Comp.3 OFF Settable Settable
A04 Compressor 4 DIN Comp.4 OFF Settable Settable
A05 Compressor 1 maintenance --- Comp.1 OFF Settable no
A06 Compressor 2 maintenance --- Comp.2 OFF Settable no
A07 Compressor 3 maintenance --- Comp.3 OFF Settable no
A08 Compressor 4 maintenance --- Comp.4 OFF Settable no
A09 Liquid level (from multifunction input) DIN / manual settable
A10
General suction pressure switch 1
(from multifunction input)
DIN COMP OFF CIRC 1 automatic no
A11
General suction pressure switch 2
(from multifunction input)
DIN COMP OFF CIRC 2 automatic no
A12
General discharge pressure switch
(from multifunction input)
DIN All comps. OFF Settable no
A13 Low discharge pressure AIN All fans OFF automatic settable
A14 High discharge pressure AIN All fans ON automatic no
A15 Low suction pressure 1 AIN All comps. OFF automatic settable
A16 High suction pressure 1 AIN all comps. ON automatic settable
A17 Low suction pressure 2 AIN All comps. OFF automatic settable
A18 High suction pressure 2 AIN all comps. ON automatic settable
A19 Suction probe 1 faulty or disconnected AIN Settable no. comps. ON manual 30 seconds See compressor management with probe broken.
A20 Suction probe 2 faulty or disconnected AIN Settable no. comps. ON manual 30 seconds See compressor management with probe broken.
A21 Discharge probe faulty or disconnected AIN Settable no. fans ON manual 30 seconds Force fan inverter to 100%.
A22 Fan 1 thermal overload DIN Fan 1 OFF Settable no
A23 Fan 2 thermal overload DIN Fan 2 OFF Settable no
A24 Fan 3 thermal overload DIN Fan 3 OFF Settable no
A25 Fan 4 thermal overload DIN Fan 4 OFF Settable no
A26 General fan thermal overload DIN All fans OFF automatic no
A27 Prevent high discharge pressure AIN Compressors OFF automatic no
A28 Compressors off for Prevent HP AIN Compressors OFF automatic no
A29 Excessive prevent frequency AIN / settable no Display only
HtE High outside temperature AIN Automatic No
HtA High ambient temperature AIN Automatic No
7.5. Alarms from analogue inputs: temperature probe and pressure transducer:
fixed differentials: 0.2 bar suction
1.0 bar discharge
High press.
Alarm off
Set Point
Alarm on
Diff.
Example of HP alarm management
Low press.
Alarm off
Set Point
Alarm on
Diff.
Example of LP alarm management