50
80415F_MSW_GFX4-IR_05-2019_ENG
AUTOMATIC / MANUAL CONTROL
By means of the digital input function you can set the controller in MAN (manual) and set the control output to a
constant value changeable by means of communication.
When returning to AUTO (automatic), if the variable is within the proportional band, switching is bumpless.
With this function (available on models with CV diagnostics option), you can run a correction of power delivered in
manual based on the reference line voltage (riF). The % value of the (Cor) is freely settable and acts in inverse proportion.
The function is activated/deactivated by means of parameter SP.r.
Example: with the following settings: Cor = 10%; riF = 380; SP.r = value + 8; instrument in manual; line voltage 380
VAC, manual power set at 50%, following a 10% increase in line voltage, 380V + 10% (380V) = 418V, there is a decrease in
set manual power equal to the same % of change: 50% - 10% (50%) = 45%.
To use this function, the controller must have a CT (current transformer) and a VT (voltage transformer).
N.B.: the % change in manual power is limited to the value set in parameter “Cor”.
The maximum manual power correction is limited to ± 65%.
HOLD FUNCTION
The process variable value and the setpoints remain “frozen” for the time the digital input is active.
By activating the digital input with the Hold function when the variable is at values below the setpoint, a setpoint
memory reset de-energizes all energized relays and resets all memory latches.
MANUAL POWER CORRECTION
505
rif
R/W
Line voltage
0.0 ...999.9
0.0
Compensation of the voltage transformer read to maintain output
power at a constant level.
506
(or
R/W
Correction of manual power based on
line voltage
0.0 ...100.0 %
0.0
1
bit
AUTO/MAN
OFF = Automatic
ON =Manual
R/W
2
132 - 471
0v.p
R
Value of control outputs
(+Heat / -Cool)
(W – only in manual mode at address 252)
140
diG.
R/W
Digital input function
0
See: Table of digital input functions
618
diG.2
R/W
Digital input function 2
0
140
diG.
R/W
Digital input function
0
See: Table of digital input functions
618
diG.2
R/W
Digital input function 2
0
64
bit
HOLD
OFF = Disable hold
ON = Enable hold
R/W
18
136 - 249
SP.r
R/W
Remote setpoint
(SET gradient for manual power
correction)
0
Type of remote set
Absolute/Deviation
0 Digital (from serial line)
Absolute
1 Digital (from serial line)
Deviation local set (_SP o SP1 o SP2)
2
Auxiliary input
Absolute
3 Auxiliary input
Deviation set (_SP o SP1 o SP2)
+4 set gradient in digit/sec.
+8 correction of manual power based on line voltage
+16 disable saving of local setpoint _SP
+32 disable saving of local manual power (at switch-off returns to last value
saved)
Setpoint table
305
R/W
Instrument state (STATUS_W)
See: Table of instrument settings
252
R/W
MANUAL_POWER
-100.0...100.0%
0.0
