Danfoss vlt aqua Programming Guide

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 (par.
22-3*) for tuning of the No Flow function must be set to default.
Configuration possibilities, overview:
Internal PI Controller
(Par. 1-00: Closed loop)
External PI Controller or manual
control
(Par. 1-00: 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/Tempera-
ture (transmitter
connected)
Yes No
Output frequency No Yes
NB!
Sleep Mode will not be active when Local Reference is active (set speed manually
by means of arrow buttons on the Local Control Panel). See Par. 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.
VLT
®
AQUA Drive Programming Guide 2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark 203
2

Danfoss vlt aqua Specifications

General

Supply Voltage	200-240V, 380-500V, 525-600V
Enclosure	IP20
Features	Energy optimization
Approvals	CE, UL, cUL
Input Voltage Range	200-240V, 380-500V, 525-600V
Output Voltage Range	0 to supply voltage
Protection Features	Overvoltage, Undervoltage, Overcurrent, Short circuit, Ground fault
Communication Interfaces	PROFIBUS
Cooling Method	Air-cooled