Specifications

2.8.2 Control Structure Open Loop
130BB153.10
100%
0%
-100%
100%
P 3-13
Reference
site
Local
reference
scaled to
RPM or Hz
Auto mode
Hand mode
LCP Hand on,
o and auto
on keys
Linked to hand/auto
Local
Remote
Reference
Ramp
P 4-10
Motor speed
direction
To motor
control
Reference
handling
Remote
reference
P 4-13
Motor speed
high limit [RPM]
P 4-1
4
Motor speed
high limit [Hz]
P 4-11
Motor speed
low limit [RPM]
P 4-12
Motor speed
low limit [Hz]
P 3-4* Ramp 1
P 3-5* Ramp 2
Illustration 2.19 Open Loop Structure
In the configuration shown in Illustration 2.19, H-40 Configuration Mode is set to [0] open loop. The resulting reference comes
from the reference handling system or the local reference and is fed through the ramp and speed limitations before
proceeding to the motor control.
The maximum frequency limit curbs output from the motor control.
2.8.3 PM/EC+ Motor Control
The Danfoss EC+ concept provides the possibility for using
high efficiency PM motors in IEC standard frame size
operated by Danfoss frequency converters.
The commissioning procedure is comparable to the
existing one for asynchronous (induction) motors by
utilising the Danfoss VVC
plus
PM control strategy.
Customer advantages:
•
Option of motor technology (permanent magnet
or induction motor)
•
Installation and operation as on induction motors
•
Manufacturer independent when choosing system
components such as motors
•
Best system efficiency by choosing best
components
•
Possible retrofit of existing installations
•
High power range: 1.1 -1400 kW for induction
motors and 1.1–22 kW for PM motors
Current limitations:
•
Currently only supported up to 22 kW
•
Currently limited to non-salient type PM motors
•
LC filters not supported with PM motors
•
Over voltage control algorithm is not supported
with PM motors
•
Kinetic backup algorithm is not supported with
PM motors
•
AMA algorithm is not supported with PM motors
•
No missing motor phase detection
•
No stall detection
•
No ETR function
2.8.4 Local (Hand On) and Remote (Auto
On) Control
The frequency converter can be operated manually via the
local control panel (LCP) or remotely via analog/digital
inputs or serial bus.
It is possible to start and stop the frequency converter by
LCP using the [Hand On] and [Off] keys, if allowed in the
following parameters:
•
K-40 [Hand] Button on Keypad
•
K-41 [Off] Button on Keypad
•
K-42 [Auto] Button on Keypad
•
K-43 [Reset] Button on Keypad
Alarms can be reset via the [Reset] key. After pressing
[Hand On], the frequency converter goes into Hand mode
and follows (as default) the local reference set by pressing
[
▲
] and [
▼
].
After pressing [Auto On] , the frequency converter goes
into Auto mode and follows (as default) the remote
reference. In this mode, it is possible to control the
frequency converter via the digital inputs and various serial
interfaces (RS-485, USB, or an optional fieldbus). See more
Introduction VLT® HVAC Drive FC 102 Design Guide
MG16C102 - Rev. 2013-08-20 31
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