Carel MuC2SE, User Manual

Page: 33 / 40

33
µC
2
SE process c030220416
- rel. 2.3 - 17.05.2018
Alarm
display Alarm type Reset Compressor Pump Fan Heater Exp.
valve Output
alarm I/O exp.
board Superv.
variable Superv. variab.
description Variable
type
Ad3 Dig. input 13 alarm Manual OFF OFF OFF OFF OFF ON √ 88 (R)** OUT 13 state Digital
Ad4 Dig. input 14 warning Manual - - - - - ON √ 89 (R)** OUT 14 state Digital
Ad4 Dig. input 14 alarm Manual OFF OFF OFF OFF OFF ON √ 89 (R)** OUT 14 state Digital
Ad5 Dig. input 15 warning Manual - - - - - ON √ 90 (R)** OUT 15 state Digital
(*): if the probe is set for compensation, the unit will continue to operate in the event of a fault.
(**): status of the output selected with parameters P42…P46.
8.2 Alarm description
HP1 : high pressure. The alarm is detected irrespective of the status of the pump and the compressors. The compressors are immediately stopped
(ignoring the set protection times), the alarm relay is activated, and the display starts flashing. The condensing fan is activated at maximum speed for
60 s to oppose the alarm, after which it is switched off. This alarm may also be generated when the high pressure limit is exceeded (active only
when pressure transducer is fitted) set by the parameter P18, which to be enabled must be greater than 3.0 bar, due to the corresponding hysteresis.
The following figure the graphics shows alarm automatic reset.
ON
OFF
t
HP1
B4
P18
P18 - 3
Key: t = time
LP1 : Low pressure
The alarm depends on P15, on P7 and on P3.
P15=1, P07= 1: the alarm is detected after time P03 with compressors off or active depending on P15. The hysteresis for this alarm is 1 bar.
tP
: General overload
The alarm is detected irrespective of the status of the pump and the compressors. The compressors, the pumps and fans stop (without observing the
protection times) or are inhibited from starting, the alarm relay is activated, the display flashes
the corresponding message, and the LED flashes. It can be reset either manually or automatically (see par. P08, P09, P13).
tC1 : Circuit thermal overload.
LA : general warning.
This represents a generic warning that appears on the display, via digital input, without modifying the operation of the unit, the alarm relay will be
activated.
FL : flow switch alarm.
This alarm is detected only if the pump is on (excluding the delays when starting P01 and P02 in normal conditions), irrespective of the status of the
compressor. All outputs are disabled: pump, compressor (without respecting switch-off times), condenser fan and the alarm relay is activated and the
display flashes. The presence of the utility water pump must be enabled (H5

0). It can be reset either manually or automatically (see P08, P09, P13).
ON
OFF
ON
OFF
t
AL
FL
P01, P02
OFF
ON
CMP
Key: t = time
Par. Description Def Min Max U.M.
P18 High pressure alarm threshold
0=alarm disabled 20 0 99,9 bar
P36 High pressure alarm management
0 = Always
1 = With compressor active, after 2 s from activation 0 0 1 -
Par. Description Def Min Max U.M.
P01 Flow switch alarm delay at pump start-up 20 0 150 s
P02 Flow alarm delay in normal conditions 5 0 120 s
P03 Low pressure alarm delay at compressor start-up 40 0 200 s