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5.6.5.
Power alarm
The power alarm can be linked to each PID, PID1 and PID2
control LOOP. The alarm is inactive if the control is ON/OFF
during Self-Tuning and in Manual.
The alarm signals possible power changes (OUT.P1 or OUT.
P2) after the process variable (PV) has stabilized on the
setpoint (SSP active).
The process variable is considered stable after 300 seconds.
The reference power is refreshed only at power-on or after a
setpoint change.
If the process variable exits the stabilization band after an
initial stabilization, this has no effect on the alarm.
In case of PV in SBR or Err error:
•
if the PV has not yet stabilized, FAULT power is supplied;
•
if the PV has stabilized, the average power for the last
5 minutes is supplied.
Set a power alarm as follows:
•
If necessary, assign an output (OUTPU.1 ...OUTPU.4)
for the power alarm (POWR1 for PID1 or POWR2 for
PID2).
•
Set the band (PV.BND) within which the process variable
is considered stable after 300 seconds have elapsed.
5.7.
Retransmission output
The retransmission output is used mainly to retransmit the
OUT.PW control power.
5.8.
Switching the software on/off
5.8.1.
How to switch it off
Keep the
and
keys pressed for 5 seconds to deactivate
the controller.
The device goes to an "OFF" state and assumes the behavior
of a controller switched off.
The voltage is not switched off: the process variable (PV)
display stays on, but the SV display is off.
All outputs (control and alarms) are OFF (logic level 0, relays
de-energized) and all controller functions are inhibited except
"POWER-UP", serial communication and the Math Function
Blocks.
The programmers are suspended in their current condition.
5.9.
Soft-Start
If enabled (by setting SOFT.S = ON on the PID configuration
menu), the Soft-Start function slices power based on
the forcentage of time lapsed since controller power-on
compared to the time set in the parameter SOFT.T
80209C_MHW_850-1650-1850_01-2020_ENG_pag. 202
•
Set the band (PW.BND) outside of which the alarm is
activated after TIME has elapsed.
The reference power is the active power after 300 sec-
onds.
300 s
Variabile di
processo
SSP
Potenza
Potenza
media
Allarme di potenza
The alarm is reset and the reference power is refreshed only
at power-on or after a change of the SSP setpoint.
The forcentage of actuation value is shown by read-only
parameter OUT. AN on the user configuration menu.
5.8.2.
How to switch it on
Keep the
key pressed for 5 seconds: the controller goes
from "OFF" to "ON" state.
At exit from software off condition, the programmers resume
execution at the point where they stopped when software
was shut off.
If voltage is switched off during the "OFF" state, at the next
Power-up the controller returns to "OFF" state (the controller
latches the "ON/OFF").
Functioning is normally enabled. To disable it, set the pa-
rameter On.OF = disab. on the MODE configuration menu.
This function can be assigned to a digital input (F.in.x,
parameter ON-OF), excluding deactivation from the keypad.
Soft-Start is an alternative to Self-Tuning and is activated
after every controller power-on.
The Soft-Start action is reset in Automatic-Manual switching.
TIME
+ PV.BND
- PV.BND
+ PW.BND
- PW.BND
ON
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