2.8.3 PM/EC+ Motor Control
The Danfoss EC+ concept provides the option of using
high efficiency PM motors in an IEC standard frame size
operated by Danfoss adjustable frequency drives.
The commissioning procedure is comparable to the
existing one for asynchronous (induction) motors by
utilizing the Danfoss VVC
plus
PM control strategy.
Customer advantages:
•
Free choice of motor technology (permanent
magnet or induction motor)
•
Installation and operation as known on induction
motors
•
Manufacturer independent when choosing system
components (e.g., motors)
•
Best system efficiency by choosing best
components
•
Possible retrofit of existing installations
•
High power range: 1.5–1900 hp [1.1–1400 kW] for
Induction motors and 1.5–30 hp [1.1–22 KW] for
PM motors
Current limitations:
•
Currently only supported up to 30 hp [22 Kw]
•
Currently limited to non-salient type PM motors
•
LC filters not supported together 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 Adjustable frequency drive can be operated manually
via the local control panel (LCP) or remotely via analog/
digital inputs or serial bus.
If allowed in
0-40 [Hand on] Key on LCP
,
0-41 [Off] Key on
LCP
,
0-42 [Auto on] Key on LCP
, and
0-43 [Reset] Key on LCP
,
it is possible to start and stop the Adjustable frequency
drive byLCP using the [Hand ON] and [Off] keys. Alarms
can be reset via the [RESET] key. After pressing the [Hand
ON] key, the Adjustable frequency drive goes into hand
mode and follows (as default) the Local reference set by
using the LCP arrow keys up [
▲
] and down [
▼
].
After pressing the [Auto On] key, the Adjustable frequency
drive goes into auto mode and follows (as default) the
Remote reference. In this mode, it is possible to control
the Adjustable frequency drive via the digital inputs and
various serial interfaces (RS-485, USB, or an optional serial
communication bus). See more about starting, stopping,
changing ramps and parameter set-ups etc. in parameter
group 5-1* (digital inputs) or parameter group 8-5* (serial
communication).
130BP046.10
Hand
on
Off
Auto
on
Reset
Figure 2.23
Hand Off
Auto
LCP Keys
Reference Site
3-13 Reference Site
Active Reference
Hand
Linked to Hand /
Auto
Local
Hand -> Off
Linked to Hand /
Auto
Local
Auto
Linked to Hand /
Auto
Remote
Auto -> Off
Linked to Hand /
Auto
Remote
All keys
Local
Local
All keys
Remote
Remote
Table 2.8 Conditions for either Local or Remote Reference
Table 2.8
shows under which conditions either the Local
Reference or the Remote Reference is active. One of them
is always active, but both can not be active at the same
time.
Local Reference will force the configuration mode to open-
loop, independent on the setting of
1-00 Configuration
Mode
.
Local Reference will be restored at power-down.
Introduction to VLT® HVAC D...
VLT
®
HVAC Drive Design Guide
2-24
MG11BB22 - VLT
®
is a registered Danfoss trademark
2
2
