gefran 1650 User Manual

80209C_MHW_850-1650-1850_01-2020_ENG_pag. 214
Configuration of STEP2
5.13.5.4. Cyclical program with 3 setpoints and 3 steps
tr5 tp5 tp5tp7tp6tr6 tr7 tr5
SP07
SP05
SP06
time
temforature
Initial
Step 5 Step 6 Step 5Step 7
CICLE 1 CICLE 2
5.13.5.5. Program with HBB (hold back band) function
Power
OFF
HBB
SP
T
i
tw1 tr tp1
t
off
t
on
tw2 tp2
time
temforature
Restart program
tw = waiting time
tr = ramp time
tp = formanence time
tp = tp1 + tp2
5.13.6. Fast simulation of program
You can easily check a selected program by launching it
in fast simulation mode. Enable it by setting the parameter
LIMIT = On on the PR.OPT submenu.
The program will run with ramp time limited to 20 seconds
and with hold time limited to 10 seconds. If the set values are
smaller they are used. In this way the maximum duration of
a step is 30 seconds.
During functioning in fast simulation, the HBB alarm is
inhibited and the control output assumes the FAULT value
on the PID submenu.
All other enabled functions (restart, start/stop, reset, manual/
automatic, end cycle or continuous cycle, event outputs,
consent from digital inputs, second channel setpoint, etc.)
are active.
5.13.7. Controlling the program from the
keypad
In the absence of enablings from digital inputs , the program
is controlled when programmer state is displayed using the
, keys, with the following modes:
•
pressed with program stopped = START;
•
pressed with program running = STOP;
• + pressed for 2 seconds = RESET
(condition maintained with key pressed);
5.13.8. Programmer Reset mode
By setting RST.SP = ON provides that with active reset com-
mand the setpoint assumes the value of process variable PV
and power is forced to zero.
Setting RST.SP = OFF maintains the active setpoint (prior to
reset) and power control.
This function is valid in case of reset from digital inputs or
enabled keys, as well as in case of reset following a program
change (possible only in STOP) or STOP/START switching at
end of program.
5.13.9. Restart with step search
If configured, in case of restart the programmer can try to
restart nor from the first program step but from the point of
the program that corresponds, or is closest to, the value of
the active process variable PV.
This function mode is called “restart with step search.”
At start, if Strt = RSCH was set on the PR.OPT submenu,
the program searches for the setpoint with value equal to
variable PV.
The search is conducted by shifting the current time forward
or back and skipping phases or steps.
The following diagram shows a typical 5-step program pro-
file and explains how restart with step search works.

gefran 1650 Specifications

General

Brand	gefran
Model	1650
Category	Temperature Controller
Language	English