Operation Description - Alfa Laval AquaPool-7 Notice D'installation, De Mise En Service Et D'entretien

INSTRUCTIONS FOR INSTALLATION AND USE.
CAUTION: when changing the display scale SCL, the parameters related to the absolute (SPL, SPH, 1SP) and differential (1HY, 1PB,
OS1) temperatures MUST be reconfigured.
Tun / 5.4

4. OPERATION DESCRIPTION

4.1. C
ONTROLLER STANDBY
used to exit from the setup or to abort the autotuning routine; with BAU=SBY the button has an additional function, i.e. it can also be
used to switch on and off the controller: keeping this button pressed for about 3 seconds changes the controller status (on / stand-by).
When it's on standby, the controller shows OFF, the output is off and it's not possible to have access to the parameter setup.
4.2. T . The output may operate in the ON/OFF or PID mode: 1Y=HY is fixed for ON/OFF control, 1Y=PID for PID
YPE OF CONTROL
control.
4.3. ON/OFF . In the ON/OFF mode the output is ON or OFF in relation to the input temperature, set point (1SP) and
CONTROL
hysteresis value (1HY). The hysteresis indicates the amplitude of deviation of the temperature from the set point in order to reactivate
the output. Increasing the hysteresis value decreases the switcheovers of the output, while decreasing the hysteresis value gives finer
control. For the output to operate in the heating mode, assign a negative value (see Figure 1) to 1HY; assign a positive value for control
in the cooling mode (see Figure 2). With 1HY=0 the output is permanently cut out. After a switchover the output remains in the new
state for a minimum time of 1CT seconds irrespective of the temperature value.
The output in the heating mode switches off
when the temperature is higher than set point
1SP
on
off
Figure 1 ON/OFF control in heating mode
4.4. PID . In the PID mode the output is ON for a fraction of the cycle time 1CT. The cycle time characterises the dynamics
CONTROL
of the system to be controlled and influences the accuracy of the control: the higher the system speed of response the shorter the cycle
time to obtain greater temperature stability and less sensitivity to variations in load. Assign a negative value to 1PB to make the output
operate in the heating mode (see Figure 3) and a positive value for control in the cooling mode. With 1PB=0 the output is permanently
cut out.
4.4.1. P
ROPORTIONAL CONTROL
activation of the output when the temperature is inside the proportional band (1PB).
The nearer the temperature to set point, the less time of activation. A small proportional
band increases the promptness of response of the system to temperature variations, but
tends to make it less stable. A purely proportional control stabilises the temperature
within the proportional band but does not cancel the deviation from the set point.
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Internal self-test (3 seconds)
---
5.4 Sensor T1 temperature
or Over range or breakage T1
Instrument in auto-tuning
. Parameter BAU determine the functions associated with the button
1HY
The output is on when
the temperature is lower
than the set point
plus hysteresis
Time
. The temperature is controlled by varying the time of
In tuning: timeout 1error
E1
E2 In tuning: timeout 2 error
E3 In tuning: over range error
OFF Controller standby
TABLE 2
The output in the cooling mode switches on when
the temperature is higher than the set point plus hysteresis
1SP
The output is off when
the temperature is lower
than the set point
on
off
Figure 2 ON/OFF control in cooling mode
1SP
Figure 3 Proportional Control (P) in heating mode
: with BAU=NON the button is
1HY
Time
Overshoot
Steady-state error
1PB
Process
temperature
Time