Danfoss VLT Flow Drive FC 111 Design Manual page 27

VLT® Flow Drive FC 111
Design Guide
3.2.2 Control Structure Open Loop
Reference
handling
Remote
reference
A ut o mode
Hand mode
Local
reference
scaled to
Hz
LCP Hand on,
off and auto
on keys
Illustration 17: Open-loop Structure
In the configuration shown in the above illustration, parameter 1-00 Configuration Mode is set to [0] Open loop. The resulting refer-
ence from the reference handling system or the local reference is received and fed through the ramp limitation and speed limitation
before being sent to the motor control. The output from the motor control is then limited by the maximum frequency limit.
3.2.3 PM/EC+ Motor Control
+
The Danfoss EC concept provides the possibility for using high-efficient PM motors (permanent magnet motors) in IEC standard
enclosure sizes operated by Danfoss drives.
The commissioning procedure is comparable to the existing one for asynchronous (induction) motors by utilizing the Danfoss VVC
PM control strategy.
Customer advantages:
• Free choice of motor technology (permanent magnet or induction motor).
• Installation and operation as know on induction motors.
• Manufacturer independent when selecting system components (for example, motors).
• Best system efficiency by selecting best components.
• Possible retrofit of existing installations.
• Power range: 0.37–90 kW (0.5–121 hp) (400 V) for induction motors and 0.37–22 kW (0.5–30 hp) (400 V) for PM motors.
Current limitations for PM motors:
• Currently only supported up to 22 kW (30 hp).
• LC filters are not supported with PM motors.
• Kinetic back-up algorithm is not supported with PM motors.
• Support only complete AMA of the stator resistance Rs in the system.
• No stall detection (supported from software version 62.80).
3.2.4 Local (Hand On) and Remote (Auto On) Control
The drive can be operated manually via the local control panel (LCP) or remotely via analog/digital inputs or serial bus. If allowed in
parameter 0-40 [Hand on] Key on LCP, parameter 0-44 [Off/Reset] Key on LCP, and parameter 0-42 [Auto on] Key on LCP, it is possible to
start and stop the drive via LCP by pressing [Hand On] and [Off/Reset]. Alarms can be reset via the [Off/Reset] key.
Hand Off
Reset
On
Illustration 18: LCP Keys
Local reference forces the configuration mode to open loop, independent on the setting of parameter 1-00 Configuration Mode.
Danfoss A/S © 2021.04
P 4-14
M ot or speed
high limit [H z]
Remote
Reference
L ocal
P 4-12
M ot or speed
lo w limit [H z]
Auto
On
100%
P 3-4* Ramp 1
P 3-5* Ramp 2
0%
Ramp
100%
-100%
AJ363928382091en-000101 / 130R0983 | 27
Product Overview
To motor
control
P 4-10
M ot or speed
dir ec tion
+