NOTICE!
Installations with cables connected in a common joint as
in
, is only recommended for short cable
lengths.
NOTICE!
When motors are connected in parallel,
parameter 1-29 Automatic Motor Adaptation (AMA)
cannot
be used.
NOTICE!
The electronic thermal relay (ETR) of the adjustable
frequency drive cannot be used as motor protection for
the individual motor of systems with motors connected
in parallel. Provide further motor protection with
thermistors in each motor or individual thermal relays.
Circuit breakers are not suitable as protection.
130BA170.11
LC filter
Figure 4.17 Installations with Cables Connected in a Common
Joint
Problems are possible at start and at low RPM values if
motor sizes vary widely. The relatively high ohmic
resistance in the stator of small motors calls for a higher
voltage at start and at low RPM values.
4.9.4 Motor Thermal Protection
The electronic thermal relay in the adjustable frequency
drive has received UL-approval for single motor protection,
when
parameter 1-90 Motor Thermal Protection
is set for
ETR Trip
and
parameter 1-24 Motor Current
is set to the
rated motor current (see motor nameplate).
For thermal motor protection, it is also possible to use the
MCB 112 PTC thermistor card option. This card provides
ATEX certification to protect motors in explosion hazardous
areas, Zone 1/21 and Zone 2/22. When
parameter 1-90 Motor Thermal Protection
is set to
[20] ATEX
ETR
and MCB 112 are combined. It is possible to control an
Ex-e motor in explosion hazardous areas. Consult the
programming guide for details on how to set up the
adjustable frequency drive for safe operation of Ex-e
motors.
4.9.5 Voltage/Current Input Selection
(Switches)
The analog mains terminals 53 and 54 allow setting of
input signal to voltage (0–10 V) or current (0/4–20 mA).
See
and for the location of the control terminals
within the low harmonic drive.
Default parameter settings:
•
Terminal 53: Speed reference signal in open loop
(see
parameter 16-61 Terminal 53 Switch Setting
).
•
Terminal 54: Feedback signal in closed loop (see
parameter 16-63 Terminal 54 Switch Setting
).
NOTICE!
REMOVE POWER
Remove power to the low harmonic drive before
changing switch positions.
1.
Remove the LCP (see
2.
Remove any optional equipment covering the
switches.
3.
Set switches A53 and A54 to select the signal
type. U selects voltage, I selects current.
Electrical Installation
VLT
®
AutomationDrive FC 302 Low Harmonic Drive
132–630 kW
48
Danfoss A/S © Rev. 04/2015 All rights reserved.
MG37A322
4
4
