Auxiliary Trip; Typical Control Methods - Danfoss VLT MCD 600 Operating Manual

Operating Guide | VLT® Soft Starter MCD 600
REDUCED EQUIPMENT LIFETIME
Continued use of emergency mode is not recommended. Emergency mode may compromise the soft starter and/or motor life
as all protections and trips are disabled. Using the soft starter in emergency mode voids the product warranty.
Do not run the soft starter in emergency mode continuously.
-

9.6 Auxiliary Trip

An external trip circuit (such as a low-pressure alarm switch for a pumping system) can be used to trip the soft starter and stop the
motor. The external circuit is connected to a programmable input (input A DI-A, COM+ or input B DI-B, COM+). To control the behavior
of the trip, set the following parameters:
• Parameter 7-1 Input A Function: Select Input Trip (N/O).
• Parameter 7-2 Input A Trip: Set as required. For example, Run Only limits the input trip to when the soft starter is running only.
• Parameter 7-3 Input A Trip Delay: Sets a delay between the input activating and the soft starter tripping.
• Parameter 7-4 Input A Initial Delay: Sets a delay before the soft starter monitors the state of the input after the start signal. For
example, a delay may be required to allow time for pipeline pressure to build up.
• Parameter 7-10 Input A Name: Select a name, for example Input A Trip (optional).

9.7 Typical Control Methods

The requirements for an application differ between each installation, but the methods listed below are often a good starting point for
common applications.
Table 18: Typical Control Methods
Application
Bow thruster
Centrifuge (separator)
Chipper
Compressor - reciprocat-
ing - loaded
Compressor - reciprocat-
ing - unloaded
Compressor - screw - loa-
ded
Compressor - screw -. un-
loaded
Conveyor - horizontal
Conveyor - inclined
Conveyor - vertical (buck-
et)
56 | Danfoss A/S © 2018.10
Start mode Start
ramp
time [s]
Constant current 5
Constant current 1
Constant current 1
Constant current 1
Constant current 1
Constant current 1
Constant current 1
Constant current 5
Constant current 2
Constant current 2
N O T I C E
Initial cur- Current
rent limit
(%FLC) (%FLC)
100 400
200 450
200 450
200 450
200 400
200 400
200 350
200 400
200 450
200 450
Operation
Stop mode Stop time
[s]
Coast to stop n/a
Coast to stop n/a
Coast to stop n/a
Coast to stop n/a
Coast to stop n/a
Coast to stop n/a
Coast to stop n/a
TVR soft stop 10
Coast to stop n/a
Coast to stop n/a
AQ262141844215en-000202 / 175R1174