Invertek Drives Optidrive E2 Application Note

Application note AN-ODE-2-003
Optidrive Applications Support Library
Application Note AN-ODE-2-003
Title
Related Products Optidrive E2
Level
1

Overview

This feature determines the way in which the motor comes to standstill, either when the drive enable signal is removed or in the
event of mains supply voltage loss.
For loss or removal of the drive enable input, applications may require the drive to decelerate at a constant ramp rate, to coast
to a stop, or to perform an emergency stop of the motor (stop as quickly as possible).
In the event of mains supply loss the application might require the drive to stop the motor as quickly as possible. Other
applications might require that the drive remains operational as long as possible, resuming normal operation if the mains supply
is returned.
This application note describes how the Optidrive E2 can be used to perform for these different operational modes.
Optidrive E2 Behaviour on loss of Enable Signal (Normal Stop Condition)
Normal stopping occurs when the enable signal is removed from the Optidrive. The mains power supply must always be
maintained on the Optidrive for a normal stop to be performed.
When P-05 is set to 0 (default value), the motor is ramped to a controlled stop with the stopping time determined by:-

the output frequency at the time the stop command is received

the motor rated frequency set in P-09

the ramp down time programmed in P-04 (or P-24)
With some settings of P-15 (digital input configuration) it is possible to select the 2nd deceleration ramp time, so that
(depending on the status of the digital inputs) the ramp down time will be controlled by P-24 as opposed to P-04. This can be
utilised in applications which occasionally require a faster stopping time than the normal ramp down time. See the relevant
Optidrive E2 User Guide for details on how to select this function.
When P-05 = 1 (coast to stop selected), the Optidrive output is immediately disabled following loss of the enable command, and
the motor and connected load will decelerate depending on the inertia and friction in the system (Uncontrolled or coasting to
stop). This mode can be useful on high inertia applications where the stopping time is not important, or very high friction loads
such as extruders whereby the motor will stop quickly, without assistance from the drive.
It is important when this setting is used in applications with high inertia loads such as fans, which may continue to rotate after
the drive has been disabled, and may still be rotating when the drive is re-started, that the spin start function is also enabled (P-
33 = 1).
AN-ODE-2-003 Setting the Required Stopping Mode
Setting the Required Stopping Mode
1 – Fundamental - No previous experience necessary
2 – Basic – Some Basic drives knowledge recommended
3 – Advanced – Some Basic drives knowledge required
4 – Expert – Good experience in topic of subject matter recommended
24 April 2014
1