5-16 Switch Setting & Start-Up MN792
Starting and Stopping Methods Continued
Coast to Stop (terminal B9)
Action – Remove 24V from Terminal B8 to stop. The motor speed is brought to zero by conditions defined in the
PROG. Stop Time (ramp rate) and PROG. Stop I Limit parameters.
The control output is automatically quenched and the contactor is opened. The motor coasts to a stop. The
motor coast stop rate is dictated by the motor and load inertia – the drive does not control the motion.
Standstill
Standstill logic inhibits rotation during Zero Speed demand. If the drive speed is less than the zero speed
threshold [12] and Standstill Logic [11] is enabled, the speed and current loops are disabled to prevent shaft
oscillation around zero speed.
Trip Condition
When a trip condition is detected, the motor coasts to a stop. The motor coast stop rate is dictated by the motor
and load inertia. The control cannot be enabled until the trip condition has been cleared and successfully reset.
Normal Starting Method
To achieve a normal start, two actions must occur:
1. Apply 24V to Terminal C4 (Enable).
2. Apply 24V to Terminal C3 (Start).
The Control will not start if there are alarms present, or if Terminals B8 (Program Stop) or B9 (Coast Stop) are
low, 0V. Ensure that Program Stop and Coast Stop are valid before Start/Run is applied.
Advanced Starting Methods
Jog
1. Apply 24V to Terminal C4 (Enable).
2. Apply 24V to Terminal C6 (Jog Mode)
The Control will not start if there are alarms present. The control can be started using JOG SPEED 1, JOG
SPEED 2. Also refer to the STOP RATES function block: CONTACTOR DELAY parameter is used to prevent
multiple operations of the main contactor from rapid use of the Jog switch. Refer to Section 6 JOG/SLACK for
more information.
Crawl
1. Apply 24V to Terminal C3 (Start).
2. Apply 24V to Terminal C6 (Jog Mode)
The Control will not start if there are alarms present. Start the control using a crawl speed, in Forward. Refer to
Section 6 JOG/SLACK for more information.