TECO F33 Series, Instruction Manual, Page: 105 / 192

102 Functional Description
process feedback value goes below the set margin on
the process reference as set in [387], the VSD will wake
up automatically and normal PID operation continues,
see examples.
PID sleep when less than minimum
speed [386]
If the PID output is equal to or less than minimum
speed for given delay time, the VSD will go to sleep.
Communication information
PID Activation Margin [387]
The PID activation (wake-up) margin is related to the
process reference and sets the limit when the VSD
should wake-up/start again.
Communication information
Example 1 PID control = normal (flow or pres-
sure control)
[321] = F (AnIn)
[322] = Bar
[310] = 20 Bar
[342] = 2 s (inactive since [386] is activated and have
higher priority)
[381]= On
[386] = 10 s
[387] = 1 Bar
The VSD will stop/sleep when the speed (PID output) is
below or equal to Min Speed for 10 seconds. The VSD
will activate/wake up when the “Process value” goes
below the PID Activation Margin which is related to the
process reference, i.e. goes below (20-1) Bar. See Fig.
88.
Fig. 88 PID Stop/sleep with normal PID
Example 2 PID control = inverted (tank level
control)
[321] = F (AnIn)
[322] = m
[310] = 7 m
[342] = 2 s (inactive since [386] is activated and have
higher priority)
[381]= Inverted
[386] = 30 s
[387] = 1 m
The VSD will stop/sleep when the speed (PID output) is
below or equal to Min Speed for 30 seconds. The VSD
will activate/wake up when the “Process value” goes
above the PID Activation Margin which is related to the
process reference, i.e. goes above (7+1) m. See Fig.
89.
Fig. 89 PID Stop/sleep with inverted PID
Default: Off
Range: Off, 0.01 –3600 s
Modbus Instance no/DeviceNet no: 43371
Profibus slot/index 170/20
Fieldbus format Long, 1=0.01 s
Modbus format EInt
NOTE: Menu [386] has higher priority than menu [342].
Default: 0
Range: 0 –10000 in Process unit
Modbus Instance no/DeviceNet no: 43372
Profibus slot/index 170/21
Fieldbus format Long
Modbus format EInt
NOTE: The margin is always a positive value.
386 PID<MinSpd
Stp Off
A
387 PID Act Marg
Stp 0rpm
A
[711] Process Value
[387]
[712] Speed
[341] Min Speed
[386]
Stop/Sleep
[310] Process Ref
Activate/Wake up
[711] Process Value
[387]
[712] Speed
[341] Min Speed
[386]
Stop/Sleep
[310] Process Ref
Activate/Wake up