Carel MuC2SE Скачать руководство пользователя страница 26

Страница: 26 / 40

µC

SE process c030220416

- rel. 2.3 - 17.05.2018

6.7 Fan management

Fan operation

F01 enables the condenser fan output, according to the output assigned by parameter H11. Depending on the type of fan, the controller PWM output
(Y1), always active, requests the presence of optional boards:
1) CONVONOFF0 for the conversion of the PWM output into ON/OFF output;
2) CONV0/10A0 for the conversion of the PWM output into 0…10 Vdc or 4…20 mA output;
3) optional phase cut boards MCHRTF*/FCS (supplied with Triac). In this case, it is necessary to specify the voltages supplied by the Triac to the fan
electric motor, corresponding to minimum and maximum speed. The value set does not correspond to the rms voltage (in Volts) applied but to a
calculation unit inside the μC

SE. See the Commissioning chap. for the calculation of the fan minimum and maximum speeds.

F02 sets the operating mode of the condensation fan.
F02 = 0: always on at maximum speed, independently from the compressors. The fan is only off if the unit passes to stand-by;

F02 = 1: operation in parallel to compressor. The fan is on at maximum speed when the compressor is active;
F02 = 2: on when the corresponding compressor is active, with ON/OFF control based on the temperature/pressure settings for the minimum and
maximum speed (parameters F05-F06). When the compressors switch off, the fan deactivates irrespective of the condensing temperature/pressure.

F02 = 3: on when the relative compressor is active with speed control. When the compressor switches off, the fan also switches off irrespective of the
condensing temperature/pressure. If the condenser probe is the NTC type, on compressor switch-on, there is fans peak at maximum speed for time
F11, irrespective from the temperature measured. In the event of broken condenser probe, the fans are off.

F03 is the minimum threshold for the triac. If FCS, CONVONOFF0, CONV0/10A0 regulators are used, set this parameter at 0.

F034 is the maximum threshold for the triac. If FCS, CONVONOFF0, CONV0/10A0 regulators are used, set this parameter at 100.

F05 is the temperature/pressure set for fan speed. It determines the temperature or pressure below which the fan remains a minimum speed. In the
case of regulation ON/OFF represents the temperature or pressure below which the fan is off.

F06 is the temperature/pressure differential. If the speed controller is used, it represents the differential with respect to F05 of the temperature or
pressure, above which the fan is activated at maximum speed. In the case of regulation ON/OFF represents the differential above which the fan is on.

F07 is the temperature/pressure differential for switch-off. If the speed controller is used, it represents the differential, with respect to F05, below which
the fans switch off. Switch-on has a hysteresis of 1 °C or 0.5 bar if used for the condenser controller, respectively for temperature or pressure probe.

Fan switch-on

F11 is the fan peak time. It establishes the operating time at maximum speed at fan switch-on in order to combat mechanical inertia of the motor.
The same timing is respected also on switch-on of the compressor (irrespective of condenser temperature/pressure), if the NTC temperature probe is
selected for condenser controller and the speed control is enabled F02=3); this takes place in order to anticipate the sudden pressure increase (to
which a just as quick temperature increase in the area where the probe is positioned does not necessarily correspond) and consequently improve
regulation. If F11 = 0 the function is disabled, i.e. the fans are activated at minimum speed and then controlled on the basis of the condensation
temperature/pressure.

F12 is the triac impulse duration. It represents the duration of the impulse applied to the triac in milliseconds. For motors with inductive behaviour, set
the parameter at 2 (default). Instead, using the CONVONOFF0, CONV0/10A0 modules, FCS regulators, set the parameter at 0.

F14 is the forced ventilation time on start-up in condenser high temperature mode. It establishes the forced ventilation time at maximum speed in the
event of start-up with condenser high temperature. The function is operational if the condenser probe is temperature and only for air-water chiller. On
start-up of the first compressor of the circuit affected, it is assumed that the environment temperature is near to that present on the condenser; if the
value measured by the condenser probe exceeds the value F05-F07, the compressor switches on and the fan of the circuit is forced to the max
speed for the time set in F14.

OFF

F05

B3/B4

F06

FAN

1°C/0.5 bar

F07

F06

F05

F03

F04

FAN
SPEED