Carel uC2SE User Manual download pdf (Page 38)

ENGLISH

µC

SE process chiller +030220416 - rel. 1.1 - 27.04.2010

IO: communication error with I/O board

If the control loses communication with I/O board, all of the system will be inhibited to prevent the unit being

damaged. The alarm relay will be activated and the message will be visible on the display with ﬁ xed red LED.

HP1: High pressure circuit 1

The alarm is detected irrespective of the status of the pump and the compressors. The compressors

corresponding to circuit 1 are immediately stopped (ignoring the set protection times), the buzzer and

alarm relay are activated, and the display starts ﬂ ashing.

The fans corresponding to the condenser in circuit 1 are activated at maximum speed for 60 s, so as

to oppose the alarm situation, after which they are switched OFF. This alarm may also be generated

when the high pressure limit is exceeded (valid only when the pressure transducer is ﬁ tted) set by the

parameter P18, which to be enabled must be greater than 3.0 bars, due to the corresponding hysteresis.

HP2: High pressure circuit 2

As for HP1 but relating to circuit 2.

LP1: Low pressure circuit 1

The alarm depends on P15, P7 and P3.

P15= 0, P07= 0: the alarm is detected only if the compressors in circuit 1 are ON, and after the time P03

from when the compressors started, otherwise it is immediate.

P15= 1, P07= 0: the alarm is detected even if the compressors in circuit 1 are off, after the time P03.

P15= 0, P07= 1: the alarm is detected only if the compressors in circuit 1 are ON, and after the time P03

from when the compressors started, otherwise it is immediate, and if in heat pump mode, is activated for

pressure values less than 1 bar.

P15= 1, P07= 1: the alarm is detected also if the compressors in circuit 1 are Off, after the time P03, and if in

heat pump mode, is activated for pressure values lower then 1 bar. The hysteresis for this alarm is 1 bar.

LP2: Low pressure circuit 2

As for LP1 but relating to circuit 2.

PH1: Compressor part load circuit 1

Indicates the part load of circuit 1 due to high pressure. This situation is signalled by the message “PH1”

on the display the activation of the warning relay.

PH2: Compressor part load circuit 2

As for PC1, but for circuit 2.

tP: General thermal 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 ﬂ ashes the corresponding message, and the LED ﬂ ashes. It can be reset

either manually or automatically (see par. P08, P09, P10, P11, P12, P13).

tC1: Thermal overload circuit 1

As for tP but relating to circuit 1

tC2: Thermal overload circuit 2

As for tC1 but relating to circuit 2.

LA: generic warning

This represents a generic warning that appears on the display, from digital input, without modifying the

operation of the unit. With the 1st circuit module only, the alarm relay is activated, while with the

expansion card the warning relay can be used.

FL: ﬂ ow alarm

This alarm is detected only if the pump is ON (excluding the delays when starting P01 and in steady

operation P02), irrespective of the status of the compressor. All of the outputs are disabled: pump,

compressor (without observing the OFF times), condenser fan, and the buzzer sounds, the alarm relay is

activated and the display ﬂ ashes.

The presence of the utility water pump must be enabled (H50). It can be reset either manually or

automatically (see P08, P09, P10, P11, P12, P13).

FLb: Backup pump warning

The warning activates the warning relay and displays the message “FLb”; reset is manual. This indicates

the operation of the backup pump (if present) due to a probable fault on the main pump, suggesting that

maintenance is required. If the ﬂ ow alarm features automatic reset, the controller will make 10 attempts

to re-start the pumps, after which the FL alarm will replace FLb. If the ﬂ ow alarm features manual reset,

when ﬁ rst activated the controller will display the alarm FLb, switching over the pumps; when activated

again the FL alarm will replace FLb.

E1 to E8: probe error detected even when the unit is in Standby

The presence of a probe alarm causes the deactivation of the compressor, the condenser fans, the pump

(outlet fan in AIR/AIR units) and the heaters (so as to avoid ﬁ res in the air/air units); the buzzer and alarm

relay are activated, and the display starts ﬂ ashing.

If the probe has a compensation function, the unit will continue a operate correctly, with the exception of

the corresponding function, and the warning relay will be activated and a message shown on the display,

from E1 to E8 for probes from B1 to B8.

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Carel uC2SE User Manual Page 38

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