•
•
•
•
•
•
•
•
•
•
•
3.2.2 Control Structure Open Loop
100%
0%
-100%
100%
A ut o mode
Hand mode
L ocal
P 4-10
M ot or speed
dir ec tion
P 4-14
M ot or speed
high limit [H z]
P 4-12
M ot or speed
lo w limit [H z]
Reference
handling
Remote
reference
Local
reference
scaled to
Hz
LCP Hand on,
off and auto
on keys
Remote
Reference
P 3-4* Ramp 1
P 3-5* Ramp 2
Ramp
To motor
control
e3
0b
b8
92
.1
1
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
On
On
e3
0b
b8
93
.1
1
Off
Auto
Reset
Illustration 18: LCP Keys
Local reference forces the configuration mode to open loop, independent on the setting of
parameter 1-00 Configuration Mode
.
AJ363928382091en-000101 / 130R0983 | 27
Danfoss A/S © 2021.04
Product Overview
VLT® Flow Drive FC 111
Design Guide