Contactor Motor Select - Danfoss VLT FC Series Operating Instructions Manual

Non-bypass Component Functi...
but combined FLA of the motors must be equal to or less
than the maximum output current of the drive.
NOTE
The combined hp of the two motors is not appropriate for
sizing the drive; use FLA.
Both motors respond to drive commands or run at full
output speed in bypass. Separate overloads are required
since the drive does not monitor individual motor current
but the total current draw.
Before enabling dual motor operation
•
Complete the start-up procedure to verify each
motor rotation direction is correct and that the
system is ready in all respects for continuous full
speed operation in bypass.
•
When using dual motors, see the drive support
materials for any special requirements for running
dual motors.
Function
For dual motor operation, a separate overload relay is
connected to each motor overload. If either overload trips,
both motors stop.
Contactor motor select option
General information
The contactor motor select option is available for one drive
alternating operation between two motors.
See 7.1.5 Contactor Motor Select for details on this option.

7.1.5 Contactor Motor Select

General information
Contactor motor select (CMS) is an option available for one
drive alternating operation between two motors.
Contactors M4, M5, and switch SW2 are added in the
option panel for this function. The motors must be of
equal hp and current rating and match the drive rating (as
in single motor operation). Motor selection is made
through a panelmounted selector switch (SW2), remotely
through control wiring input, serial communications, or the
drive's smart-logic controller. Status reporting is available
to indicate which motor is in operation.
Before enabling contactor motor select
•
Complete the start-up procedure to verify the
motor rotation direction is correct for both
motors and that the system is ready in all
respects for continuous operation.
Operation
•
The panel mounted contactor motor select switch
(SW2) has three positions: Motor 1/Auto/Motor 2.
It is operated by hand for manual operation. The
Option Panel Operating Instructions
Motor select status
Contactor motor select function setup
For EMB(0) or ECB, see the connection drawing supplied
with the unit. For EMB1 or EMB2, make connections as
follows.
Contactor motor select switch
This optional switch is provided for contact motor select
available with the EMB option when two equally rated
motors are operated by one drive. The panel mounted
Motor 1/Auto/Motor 2 selector switch provides local
control of motor 1 or 2 along with an auto setting that
allows for remote motor selection.
®
MG14I102 - VLT is a registered Danfoss trademark
motor 1 position selects motor 1, and the motor
2 position selects motor 2.
•
When SW2 is in the auto position, either motor
can be selected remotely. (Do not close both
contacts at once.)
•
The drive's smart-logic controller can alternate
motors when SW2 is in auto position. See the
drive support materials for details.
•
Serial communications commands can alternate
motors when SW2 is in auto position. See the
drive support materials for details.
•
The EMB option panel reports the motor selected
in either local or remote operation.
•
For remote control, connect control wiring to
connector X56 terminals 11 and 12 for motor 1
operation and to terminals 11 and 10 for motor
2.
•
For status reporting, wire to connector X55
terminals 11 and 12 for motor 1 select, and
connector X56 terminals 1 and 2 for motor 2
select.
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