Auxiliary Functions - Carel FCM series Manual

Ü Ü
C00=5 DIRECT(SET1) /DIRECT(SET2) mode through digital input
This operating mode depends on the status of the digital input ID1:
ID1 not active (open)
ID1 active (closed)
Ü Ü
C00=6 REVERSE(SET1)/REVERSE(SET2) mode through digital input
This operating mode depends on the status of the digital input ID1:
ID1 not active (open)
ID1 active (closed)
Ü Ü
C00=7 DIRECT(SET1) /REVERSE(SET2) mode through digital input (cooling/heating operation)
This operating mode depends on the status of the digital input ID1:
ID1 not active (open)
ID1 active (closed)
Ü Ü
C00=8 DIRECT(SET1) /REVERSE(SET2) operation +Defrost through digital input
(cooling/heating operation mode with Defrost)
This operating mode depends on the status of the digital input ID1:
ID1 not active (open)
ID1 active (closed)
6.3

Auxiliary functions

In order to optimise the performance of the controller, there are extra functions available:
Measurement 'filtering'. A 'filter' with programmable time constant (see parameter C17), can be applied to the measurements detected
by the probes in order to eliminate any disturbance or slow down the response of the system.
Min/Max. Allows the operating field of the 0÷10 V output to be limited within a maximum (parameter C05) and a minimum value
(parameter C04), programmable in %.
Soft-start. Allows you to limit the variation speed of the 0
system (parameter C06).
Cut-off (not available in SLAVE mode). If the minimum value of the 0
allows the output to be cut-off if the measurement exceeds the set limit (parameter C07). There is a hysteresis in order to avoid hunting
problems.
Speed-up (not available in SLAVE mode). Forces the 0
starting from output-disabled status, a value different than zero is selected. This function may be used to overcome system inertia and, in
case of fan-speed control, it ensures rotation even at slow speed (which is normally difficult when the fans are off).
Type of set-point (not available in slave mode). Defines the position of the set-point within the control band (or differential) (parameter
C03)
set-point at min. value
C03=0
max
min
set-point at average
value C03=1
max
min
set-point at max. value
C03=2
max
min
• •
Integral control action (not available in SLAVE mode)
The control action, normally proportional, can be modified to PI (proportional and integral) with programmable integral action (parameter
C09). In this case, the control acts so as to maintain the measured value within the control band, independently of the type of set-point
selected.
FCM electronic regulator
Ü
DIRECT operation with main set-point and differential (param. St1 and P01);
Ü
DIRECT operation with secondary set-point and differential (param. St2 and P02)
Ü
REVERSE operation with main set-point and differential (param. St1 and P01);
Ü
REVERSE operation with secondary set-point and differential (param. St2 and P02);
Ü
DIRECT operation with main set-point and differential (param. St1 and P01);
Ü
REVERSE operation with secondary set-point and differential (param. St2 and P02);
Ü
DIRECT operation with main set-point and differential (param. St1 and P01);
Ü
REVERSE operation with secondary set-point and differential (param. St2 and P02) and Defrost
cycle management (param. P40, P41, P42, P43, P44 and P45). The relay output is utilised to
manage the four-way valve for inverted freezing circuit.
÷
"DIRECT" mode
Vout % differential
cutoff
setpoint
temp.
Vout % differential
cutoff
setpoint
temp.
Vout % differential
cutoff
setpoint
temp.
÷
10 V output so as to avoid excessive stress on the actuator or stabilise the
÷
10 V output is set to a value different than zero, this function
10 V output to the maximum set level, for a set time (parameter C08) when,
CONTROL OPERATING MODES
Vout %
max
min
Vout %
max
setpoint
min
Vout %
max
min
Fig.3
7
"REVERSE" mode
differential
cutoff
setpoint
temp.
differenial
cutoff
temp.
differential
cutoff
setpoint
temp.
Cod. +302235300 - Rel. 2.0 del 30/11/98