Danfoss VLT, Руководство по программированию

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130BA258.10
t
1
p
(Pressure)
Time
Time
No/Low Flow
detected
p
System
P
Set
Sleep mode
activated
P
Ref
= P
Wake
(Frequency)
f
Ref
f
Ref /
f
Out
f
Ref
f
Out
f
Wake
f
Out
When low power or low speed is detected the motor is stopped, but the reference signal (f
ref
) from the external controller is 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
wake
the motor restarts.
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.
Configuration possibilities, overview:
Internal PI Controller
(
1-00 Configuration Mode : Closed loop)
External PI Controller or manual control
(
1-00 Configuration Mode : Open loop)
Sleep mode Wake up Sleep mode Wake up
No Flow detection (pumps only) Yes Yes (except manual
setting of speed)
Low speed detection Yes Yes
External signal Yes Yes
Pressure/Temperature
(transmitter connected) Yes No
Output frequency No Yes
NOTE
Sleep Mode will not be active when Local Reference is active
(set speed manually by means of arrow buttons 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.
22-40 Minimum Run Time
Range: Function:
10 s
*
[0 - 600 s] Set the desired minimum running time for the
motor after a start command (digital input or
Bus) before entering Sleep Mode.
22-41 Minimum Sleep Time
Range: Function:
10 s
*
[0 - 600 s] Set the desired Minimum Time for staying in
Sleep Mode. This will override any wake up
conditions.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark 147
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