Product Overview
Table Of Contents
© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 23
I064 – Valve step mode
Stepper motor can be driven with various step excitation method. The selection of the right method
depends on the valve requirements as well as operating conditions of an application.
The valves can be driven in full step 1/1, half step 1/2, or in microsteps (1/4, 1/8, 1/16). Danfoss
recommends to use 1/8 stepping mode as this provides a good balance between torque and speed
and ensures smooth operation.
Full stepping mode 1/1, provides higher torque which is needed for application having high
dierential pressure, but high rate of acceleration increases the risk of lost steps.
Half step excitation 1/2, is geneally use for Unipolar valves. and microstepping 1/16 is used where
smooth operation is needed. This will provide a bit lower start torque.
I065 – Valve duty cycle
The required valve duty cycle can be set between 5-100% using this parameter. Some valves requires
higher duty cycle when operating at lower uid temperature. Reduce the duty cycle for the valve that
uses high uid temperature.
I070 – Start Backlash
The parameter denes the operation of the start backlash function. The valve will normally open
from this point onwards.
I071 - Backlash compensation (Hysteresis)
The number of steps needed to correct for mechanical hysteresis when a reduction gear is part of the
valve design. This adjustment is only applied if an additional opening of the valve is requested. To
ensure that the backlash is at a minimum, the motor will drive a number of extra steps every time the
direction of the motor is changed.
I076 Valve excitation time after stop
The time that the drive current is applied after the motor has stopped before going to holding
current. This will make sure that the valve has achieved the nal position before going to holding
current.
0% OD
Start backlash
100% OD
T
otal number of steps
Requested OD
Danfoss
80G343.10