91
CASCADE CONNECTION
Menu Par.
No.
Nr. dis-
played
Display
Description
Range
Factory
setting
UM
Access
type
Category
M2
148
Power
Mode
Defines the cascade operation mode.
0 Disabled 1
Min burners 2
Max burners
2
I
Cascade
M2
79
Max.
Setp.
Offset
Down
Defines the maximum decrease in the prima-
ry circuit's cascade set-point. Is based on the
primary circuit's probe reading.
0…40
2
°C
I
Cascade
M2
80
Max.
Setp.
Offset Up
Defines the maximum increase in the primary
circuit's cascade set-point. Is based on the
primary circuit's probe reading.
0…40
5
°C
I
Cascade
M2
81
Start
Mod. De-
lay Fact.
Defines the time in minutes from the mo-
ment the demand is triggered until the acti-
vation of the set-point increases or decreases
provided for by Par. 79 e 80.
0…60
60
Min.
I
Cascade
M2
82
Next
Module
Start
Rate
It defines the minimum power for at least
one of the modules in the cascade in order
for the next module to be switched on (if the
other conditions linked to Par. 75 and 77 are
met).
10…100
80
%
I
Cascade
M2
83
Next
Module
Stop Rate
It defines the maximum power for all the
modules in the cascade in order for the last
module on to be switched off (if the other
conditions linked to Par. 76 and 78 are met).
10…100
25
%
I
Cascade
M2
84
Module
Rotation
Interval
It defines the time interval (in days) after
which modules are rotated.
0…30
1
Days
I
Cascade
M2
149
First
Module
to Start
Establishes the number of the next module
to be rotated (this value is automatically up-
dated at each rotation).
1..16
1
I
Cascade
M2
86
PID P
Defines the proportional term to change the
setpoint of the cascade module.
0…1275
50
O
Cascade
M2
87
PID I
Defines the integral term to change the set-
point of the cascade module.
0…1275
500
O
Cascade
M2
150
PID Slew
Rate Up
Defines the speed (in °C/100 ms) with which
the set-point of individual modules is in-
creased in the event the primary circuit's
set-point is not achieved (if the value is set to
zero, the change is controlled by the PI of Par.
86 and 87 without restrictions).
0…25.5
1
O
Cascade
M2
151
PID Slew
Rate Dn
Defines the speed (in °C/100 ms) with which
the set-point of individual modules is de-
creased in the event the primary circuit's
set-point is exceeded (if the value is set to
zero, the change is controlled by the PI of Par.
86 and 87 without restrictions).
0…25.5
1
O
Cascade
M2
152
PwrMode2
Min Power
Defines the power value (in percentage
terms) against which the average power of all
on modules in cascade operation mode must
be compared (Par. 148 = 2).
0…100
20
%
I
Cascade
M2
153
PwrMode2
Hysteresis
Defines the extra power value (in percentage
terms) compared to the average power of all
on modules in cascade operation mode (Par.
148 = 2).
0…100
40
%
I
Cascade
