Danfoss VLT AQUA Drive FC 200 Programming Manual page 155

Parameter Description
2) In systems where the pressure or temperature is controlled by an external PI controller, the wake-up conditions cannot
be based on feedback from the pressure/temperature transducer as the setpoint is not known. In the example with a boost
system, desired pressure P is not known. 1-00 Configuration Mode, must be set for Open-loop.
set
Example: Boost system.
Figure 3.54
When low power or low speed is detected the motor is stopped, but the reference signal (f
still monitored and because of the low pressure created, the controller will increase the reference signal to gain pressure.
When the reference signal has reached a set value f
The speed is set manually by an external reference signal (Remote Reference). The settings (parameter group 22-3*) for
tuning of the No-Flow function must be set to default.
No-Flow detection (pumps
only)
Low speed detection
External signal
Pressure/Temperature
(transmitter connected)
Output frequency
Table 3.26 Configuration Possibilities, Overview
NOTICE!
Sleep mode will not be active when Local Reference is active (set speed manually using the arrow keys on the LCP). See
3-13 Reference Site.
Does not work in Hand-mode. Auto set-up in open-loop must be carried out before setting input/output in closed-loop.
®
VLT AQUA Drive Programming Guide
, the motor restarts,.
wake
Internal PI Controller
(1-00 Configuration Mode)
Sleep mode Wake up
Yes
Yes
Yes
Yes
No
®
MG20O622 - VLT is a registered Danfoss trademark
) from the external controller is
ref
External PI controller or manual control
(1-00 Configuration Mode)
Sleep mode Wake up
Yes (except manual
setting of speed)
Yes
Yes
No
Yes
3 3
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