Operation; Start, Stop, And Reset Commands; Command Override; Auto-Start/Stop - Danfoss VLT MCD 600 Operating Manual

Operating Guide | VLT® Soft Starter MCD 600

9 Operation

9.1 Start, Stop, and Reset Commands

The VLT® Soft Starter MCD 600 can be started and stopped via the digital inputs, remote LCP, communication network, smart card, or
scheduled auto-start/stop. The command source can be set via the Set-up Tools, or using parameter 1-1 Command Source.
• The MCD 600 only accepts start and reset commands from the designated command source.
• The MCD 600 accepts stop commands from the designated command source, but can be forced to stop by opening the reset input,
or by opening the start/stop input during an auto-start/stop cycle.
• The programmable input can be used to override the selected command source (see parameter 7-1 Input A Function).

9.2 Command Override

The programmable input (DI-A, COM+) can be used to override the command source for situations where the normal control
mechanism has been lost. Set parameter 7-1 Input A Function to the alternative control source (for example Command Override: Keypad).
While the input is active, the soft starter only accepts commands from the selected override source. To restore control to the command
source selected in parameter 1-1 Command Source, reopen the input.

9.3 Auto-start/Stop

The soft starter can be configured to automatically start and/or stop the motor at a particular time, or run it in cycles of a specified
duration.
Start delay, restart delay, and auto-reset delay all apply to auto-start operation.

9.3.1 Clock Mode

The soft starter can start and/or stop the motor once per day.
For clock mode to operate:
• Parameter 4-1 Auto-Start/Stop Mode must be set to Enable.
• Parameter 1-1 Command Source must be set to Clock.
• The reset input must be closed.
• The start input (START, COM+) must be active. This allows the soft starter to be stopped via the digital inputs in an emergency.
Clock mode operation is controlled by parameters 4-4 to 4-24.

9.3.2 Timer Mode

The soft starter can automatically stop the motor after a specified run-time, then restart it after a specified off (stopped) time. The soft
starter repeats the cycle while the start signal remains active.
For timer mode to operate:
54 | Danfoss A/S © 2018.10
N O T I C E
Operation
AQ262141844215en-000202 / 175R1174