Powerthrough; Emergency Mode - Danfoss VLT MCD 600 Operating Manual

Operating Guide | VLT® Soft Starter MCD 600
• Parameter 4-1 Auto-Start/Stop Mode must be set to Enable.
• Parameter 1-1 Command Source must be set to Timer.
• The reset input must be closed.
• The first start must be commanded by a start signal.
Timer mode operation is controlled by parameters 4-2 to 4-3.

9.4 PowerThrough

PowerThrough allows the soft starter to control the motor even if the soft starter is damaged on 1 phase. The VLT® Soft Starter MCD
600 uses 2-phase control techniques to soft start and soft stop the motor.
The soft starter trips on Lx-Tx Shorted on the first start attempt after control power is applied. PowerThrough does not operate if
control power is cycled between starts.
• PowerThrough is only available with in-line installations. If the soft starter is installed inside delta, PowerThrough will not operate.
• PowerThrough remains active until 3-Phase Control Only is reselected. While operating in PowerThrough, the trip LED flashes and
the display indicates 2 Phase - Damaged SCR.
• PowerThrough operation does not support adaptive control soft starting or soft stopping. In PowerThrough, the soft starter
automatically selects constant current soft starting and timed voltage ramp soft stopping. If PowerThrough is enabled, Parameters
2-3 and 2-4 must be set appropriately.
PowerThrough uses a 2-phase soft start technology and extra care is required when sizing circuit breakers and protection.
Contact the local supplier for assistance.

9.5 Emergency Mode

Emergency mode allows the soft starter to run the motor and ignore trip conditions.
Emergency mode is controlled via a programmable input (input A DI-A, COM+ or input B DI-B, COM+). Parameter 7-1 Input A Function/
parameter 7-5 Input B Function must be set to Emergency Mode. A closed circuit across DI-A, COM+ activates emergency mode. When
the soft starter receives a start command, it continues to run until a stop command is received, ignoring all trips and warnings.
Emergency mode can be used with any command source.
Although emergency mode operation satisfies the functionality requirements of fire mode, Danfoss does not recommend its
use in situations that require testing and/or compliance with specific standards as it is not certified.
Danfoss A/S © 2018.10
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