Emerson EIM 2000 Series User Manual page 14

Appendix
March 2013
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Turn-off Delay = 10 Seconds = Delay after motor stops before turning off Openor
Close reversing contactor outputs unless a reversal in direction is required.
If reversal in direction, then Modulation Delay time is used. Valid only when
Futronic III or Futronic IV modes are selected. This delay prevents excessive
operation of the contactor while modulating or the 4-20mA command signal is
being ramped by a PID control loop.
Accel = Time required to accelerate motor speed from zero to full speed when
motor is started due to Error greater than Deadband. The purpose of Accel is to
soft-start the motor and to help prevent control overshoot when making small
position changes. Accel is inversely proportional to Error and is automatically
adjusted by the controller.
Decel = Time required to decelerate motor speed from full speed to zero while
Position is approaching Command position setpoint. Valid only when Futronic
III or Futronic IV modes are selected. Decel is proportional to Error. If motor is
at full speed (Accel time expired) and Error is less than tuned parameter then
the controller begins decelerating motor speed over a period of time where
Decel=(Error-Deadband)*T Sec. Decel is activated only when Accel time has
expired. This prevents motor stall when making small position changes.
If Error is less than Deadband then Decel=0.
DC Motor Speed Control = Full speed of the motor is set at the factory using
a potentiometer on the SCR motor control module. The Digital Futronic module
regulates full speed of the motor, maintaining accurate speed/valve travel time
regardless of high or low power line conditions and varying load conditions. Valid
only for Futronic III.
User Manual
84829 Rev. D
Appendix