Table of Contents
Advertisement
Remote control
Remote circuits connected to the MCD3000 control
inputs can be used to operate the starter when in
remote control mode. Refer to the Installation section
of this manual for detail on control wiring options.
Serial communication
The RS485 serial link can be used to control operation
when the starter is either local or remote modes. Refer
to the Installation section of this manual for detail on
serial communications functions.
Restart delay
Par. 15 Restart Delay sets a minimum time between
the end of a stop and the beginning of the next start.
During this period the LED to the right of the numeric
display will flash, indicating the motor cannot be
started.
Secondary parameter set
The MCD3000 has two motor parameter sets.
•
Primary Parameter Set : Par. 1 - 9
•
Secondary Parameter Set : Par. 25 - 33
When the MCD3000 is in the off state and is
commanded to start, it checks the Par. Set control
input. If open circuit the primary parameter set is used.
If closed circuit the secondary parameter set is used.
27
28
ATTENTION
If the start command is given while the
MCD3000 is in the process of stopping (Soft
stop or D.C.Braking) the MCD3000 restarts without
checking the Par. Set control input.
Motor thermal model
The MCD3000 motor overload protection is an
advanced motor thermal model. Motor temperature is
continuously calculated by the microprocessor that
uses a sophisticated mathematical model to
accurately reflect motor heat generation and
dissipation during all stages of operation. e.g. Starting,
Running, Stopping & Stopped.
Because it operates continuously, the motor thermal
model eliminates the need for protection systems such
as; Excess Start Time, Limited Starts per hour etc
MG.15.A2.22 – VLT is a registered Danfoss trademar
Par. Set
MCD3000 Series
The state of the motor thermal model can be viewed
on the numeric display while the MCD3000 is not in
programming mode. Use the [+/-] keys to change the
parameter shown on the numeric display.
Motor temperature is shown as a % of maximum
temperature. An overload trip occurs at 105%.
Pre-start tests
On receiving a start command, MCD3000 starters
operate the Line Contactor relay output (if
programmed) and then perform a series of tests
before applying voltage to the motor terminals and
operating the Output On relay output (if programmed).
Operation after power loss
When control and supply voltage is applied to the
MCD3000 it will enter either the local or remote mode
according to the state it was in when voltage was
removed.
If in remote mode, the condition of the remote control
inputs is checked and if a start command is present
the motor will be started.
If in local mode, the motor will not be restarted until
the [START] push button is activated.
29
Hide quick links:
Advertisement
Table of Contents
