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To do this, set code Pty +64 in the ProG menu.
The program runs with the ramp and hold times limited to 20 and 10 seconds, respectively. Lower values entered are accepted.
In this mode, the maximum duration of a step is 30 seconds
In fast simulation mode, hold back band (Hbb) is inhibited, and control output takes on FAc.P value.
All other functions enabled (type of restart, start/stop, reset, manual/automatic, end of cycle or continuous cycle, event outputs, clearance from
digital inputs, slave channel setpoint, etc.) are active.
- Autoreset means that programmer reset is active in Stop phase, with acquisition of the variable as current setpoint and resetting of time base.
- With the controller in manual or with absolute remote setpoint, the programmer time base is stopped.
- When switching from remote to local setpoint, the setpoint assumes the value of the remote setpoint at the time of switching.
Program control from panel:
In the absence of enabled digital inputs, alarms, M/A key (butt = 10, 11), program control engages when programmer state is displayed by
using the Raise, Lower, and M/A keys.
Raise in stop = START; Lower in start = STOP; M/A pressed for 2 seconds = RESET (condition maintained with key pressed); Lower for 2
seconds in stop = enable change of programmer state.
When programmer state is not displayed, M/A key maintains function selected with "butt."
Programmer Reset Mode:
With standard function, when the control is active the setpoint takes on the value of the process variable and power is forced to zero. When
parameter "_ _ r.t." is set to +16 and the reset control is active, the current setpoint (prior to reset) and power control are maintained. This
function is applicable with reset from digital inputs or enabled keys, and also with reset following a program change (possible only in STOP) or
from STOP/START switching at the end of a program.
The example shows a typical setpoint profile that can be programmed by setting a single 5-step program.
At start, if parameter Pty = 2 (in ProG), the program searches for the setpoint with value equal to PV.
The search is performed by moving the current time forward or backward, skipping phases or steps.
If the variable is lower than that required during a setpoint increase phase (point A, t1), at restart the current time base is lowered by
intercepting the setpoint profile (point A1).
If the variable is lower than that required during a setpoint decrease phase (point B,
t2), at restart the current time base is raised by intercepting the setpoint profile (point
B1). If interception is not possible, as in the case of variable at PV1, program restart
occurs at the current time and setpoint.
If the Hbb control is enabled, the programmer time base remains stopped until the
variable re-enters the set tolerance band, symmetrically placed around the setpoint.
EXAMPLE of programmer state display:
Program = 2, Step = 5, Segment = Hold, time elapsed = 20:42 (MM:SS)
Flashing LED when program is in RUN. LED on
steady when program is in STOP, END,
HOLD and time base stopped.
Flashing letter "P" in programmer state
The setpoint can be changed directly from the keyboard only when the program is in STOP.
To change programmer state, press the "Lower" key for 2 seconds: the letter "P" will start flashing rapidly. Press key "F" to scroll: program,
step, segment, time.
Flashing of the decimal point in each element indicates that the value is enabled for modification ("P" flashes slowly).
Use the "Raise" and "Lower" keys to set the required values. Press the "Lower" key for 2 seconds while "P" flashes rapidly or go to START to
disable programmer state modification phase.
Program change automatically generates a reset.
Reset state is also entered by setting current step 0 (zero) and setting the current segment to "off" (lower right digit off).
Display / Modification of programmer state
Level 1 display:
programmer
state
*
access
granted only
with program in
STOP
28
Ripartenza with search of the step
8 • STATE OF THE PROGRAMMER
modification phase
N° of current program
*
for 2 sec.
Programmer
modification phase
F
modify time
PV
/
Set point
PV1
Passo 0
Current time of segment (ramp or hold) in
HH:MM or MM:SS (see time base)
Dynamic indication of segment (ramp or
hold); off at the end of program
Flashing LED in modification phase
N° of current step
F
modify program
F
B
A
B1
A1
1
2
3
4
t1
t2
F
modify step
modify segment
80215G_MHW_800P_07-2021_ENG
tempo
F
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