Sleep Mode; Monitoring Mode Screens - WEG CFW-11 Programming Manual

20.3 SLeeP MoDe

The sleep mode is a useful resource for saving energy when using the PID regulator.
In many PID applications energy is wasted by keeping the motor turning at the minimum speed when, for
instance, the pressure or the tank level keeps increasing.
The sleep mode works together with the zero speed disable function.
In order to activate the sleep mode, enable the zero speed disable by programming P0217=1 (On). The disable
condition is the same as for the zero speed disable without PID. Refer to the section 12.6.
For leaving the zero speed disable mode, when in the automatic PID mode, besides the condition programmed
in P0218, it is also necessary that the PID error (the difference between the setpoint and the process variable)
be higher than the value programmed in P0535.
DaNGeR!
While in the sleep mode, the motor may turn at any moment because of the process conditions. If
it is wished to handle the motor or to perform any type of maintenance, remove the power from the
inverter.

20.4 MoNitoRiNG MoDe ScReeNS

When the PID regulator is used, the monitoring mode screen can be configured to show the main variables in
a numerical form or as a bar graph, with the respective engineering units.
Table 20.2 - Parameter setting for the presented example
Parameter
P0203=1 Selection of the PID regulator function
P0527=0 PID action type (Direct)
(1)
P0524=1 AI2 feedback input
(1)
P0238=1 AI2 signal type (4 to 20 mA)
P0237=1.000 AI2 input gain
(1)
P0239=0 AI2 input offset
(1)
P0528=250 Process variable scale factor
P0529=1 Process variable decimal point (wxy.z)
(1)
P0220=1 Operation in remote situation
P0222=0 Reference selection (HMI)
P0525=80% PID Setpoint
P0230=1 Dead zone (On)
P0205=10 Reading Parameter Selection 1 (Process variable)
(2)
P0206=9 Reading Parameter Selection 2 (PID setpoint)
(2)
P0207=2 Reading Parameter Selection 3 (Motor Speed)
(2)
P0536=1 P0525 automatic setting (On)
(1)
P0227=1 (1) Remote Run/Stop selection (DIx)
P0263=1 DI1 function (Run/Stop)
(1)
P0265=22 DI3 function: Manual/Automatic
(2)
P0266=2 DI4 function (General Enable)
P0236=3 AI2 input function (Process Variable)
(2)
P0520=1.000 PID proportional gain
(1)
P0521=1.000 PID integral gain
P0522=0.000 PID differential gain
(1)
Parameters already in the factory default.
(1)
Parameter configured automatically by the inverter.
(2)
Description
PID Regulator [46]
20-7
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