The Jockey pump function controls a jockey pump with a digital output signal. You can use a
jockey pump if a PID controller is used to control the main pump. The function has 3
operation modes.
Selection
number
Selection name
Description
0
Not used
1
PID sleep
The jockey pump starts when the PID Sleep of the main
pump activates. The jockey pump stops when the main pump
wakes up from the sleep mode.
2
PID sleep (level)
The jockey pump starts when the PID Sleep activates, and
the PID feedback signal is less than the level set by parame-
ter P3.21.2.2.
The jockey pump stops when the PID feedback signal is more
than the level set in parameter P3.21.2.3 or the main pump
wakes up from the sleep mode.
JockeyStopLevel
PID Feedback
Jockey Start Level
PID Controller
Wake Up Level
Output Freq PID Sleep
Delay
PID Sleep
Jockey Pump Control
(Selected value = PID Sleep)
Jockey Pump Control
(Selected value =
PID Sleep (Level))
Fig. 106: The Jockey pump function
PARAMETER DESCRIPTIONS
VACON · 351
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