Carel uC2SE User Manual download pdf (Page 39)

ENGLISH

µC

SE process chiller +030220416 - rel. 1.1 - 27.04.2010

Hc1 to Hc4: compressor operating hour limit exceeded warning

When the number of operating hours for the compressor exceeds the maintenance threshold (as default

equal to zero, and consequently the function is disabled), the maintenance request signal is activated.

The buzzer and the alarm relay are not activated, however the warning relay is activated (with the

expansion card ﬁ tted).

Epr, EPb: EEPROM error

A problem has occurred when saving the parameters to the unit’s non-volatile memory (EEPROM); in the

event of an Epr error, the µC

SE continues to perform the control functions with the data present in the

volatile memory (RAM), where there is a physical copy of all of the data. After the ﬁ rst power failure the

conﬁ guration will be lost.

The buzzer and the alarm relay are not activated. If the occurs when starting the unit, “EPb”, the controller

will not operate.

ESP: communication error with expansion card

If the controller loses communication with the expansion card, the entire system will be stopped to avoid

adversely affecting the unit. The alarm relay is activated and the display will show the message, with the

red LED on steady.

EL1-2: warning, zero crossing error circuit 1-2

If the controller detects errors in the power supply, control may be lost over the fan speed. In this case,

the display will show a warning, and the fans will be controlled at maximum speed. The alarm is reset

automatically, so as to not affect the operation of the unit. If the expansion card is used, the warning relay

is activate)

dF1-2: warning, end defrost circuit 1-2 due to maximum time

If the defrost ends after the maximum time when end defrost by temperature or from external contact

has been selected, the unit displays the text dF1 for circuit 1 or dF2 for circuit 2. The message is cancelled

using the delete alarm procedure or when the next correct defrost cycle is completed. The buzzer and the

alarm relay are not activated. If the expansion card is used, the warning relay is activated (if used).

A1: antifreeze alarm outlet limit circuit 1

The alarm is only detected in water chillers (H01= 2, 3, 4, 5 or 6) by the evaporator water outlet

probe (B2/B6) or, if the electronic expansion driver (EVD) is connected to the tLAN, based on the

evaporation temperature sent by the driver. The evaporator water outlet temperature is compared

against the threshold A01, while the evaporation temperature is compared against the threshold A14. The

compressors in circuit 1 and the condenser fans in circuit 1 are immediately stopped, the buzzer and

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

SE is in Standby, the alarm condition is

not detected, and only the heaters are managed. Reset depends on parameter P5:

1. in the event of automatic reset, the unit restarts automatically if the temperature is above the value

A01+A02 or A14+A02.

2. in the event of manual reset, the unit can restart manually even if the alarm is active.

After the time A03, if the alarm persists the unit will stop again.

For air/air units the parameter becomes the antifreeze-outlet limit alarm set point. If the outlet limit is

active, the freecooling damper is forced closed and the message SUL is shown on the display.

A2: antifreeze alarm circuit 2

As for A1 but relating to circuit 2

Ht: high temperature warning

This alarm is activated when the threshold is exceeded (read by B1), set for the parameter P16. It is

delayed at power ON by the parameter P17 and causes the activation of the alarm relay and the buzzer,

without deactivating the outputs. It is reset automatically when conditions that caused the alarm are no

longer present.

Lt: low temperature warning

For direct expansion units (H01=0, 1) the alarm is used to measure a low room temperature using probe

B1 or B2 (depending on par. A06).

The alarm may be reset manually or automatically, and depends on the parameter P05. If the expansion

is present, the corresponding relay is activated; in the event of µC

SE module only, the alarm relay will be

used.

AHt: high temperature warning when starting the system

The advice does not activate the relay, and displays the message “AHt”.

ALt: low temperature warning when starting the system

The advice does not activate the relay, and displays the message “ALt”.

ELS/EHS: warning, low/high power supply alarm

If the power supply voltage is too low or too high, the corresponding message is displayed. In these

cases, the correct operation of the µC

SE is no longer guaranteed. In the low voltage conditions only the

requests to deactivate the loads are effected. Any start-up requests remain pending. The high voltage

condition involves the deactivation of all the energised relays.

L: Low load warning

The warning does not activate the relay and displays the message “ L ”; reset is automatic.

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Carel uC2SE User Manual Page 39

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