Stepless Setpoint Value Generation With Memory Function (Sosp) - DEMAG DIC 002 Series Operating Instructions Manual

Diagram showing 2-stage reference value steps
Fig. 46
1 (SOST) Step 2 input
2 SW-Step 1+ input
Tab. 71
8.7

Stepless setpoint value generation with memory function (SOSP)

Operating principle, general information
All setpoint value memory functions are activated when current flows through the relevant input. The input signals
are filtered by the hardware and software.
An edge from "Off" to "On" must be created following the ready for operation signal in order to obtain a valid set‐
point value.
Edge evaluation is only possible if the inverter is ready for operation. Edge signals given too early will not be
detected and have to be repeated.
Setpoint value memory function
This setpoint value creation function is specially designed for use with 2-stage buttons. A 2-stage button is re‐
quired for each direction of rotation. The first step actuates the SW-Step 1+ 68 or SW-Step 1- 69 input. The
second step actuates the relevant (SOSP) Acceleration 62 input.
When the first SW-Step 1+ 68 step is applied, the inverter accelerates up the Acceleration 420 ramp to the
value of the Minimum frequency 418 parameter. If a signal is applied to the (SOSP) Acceleration 68 input
in addition to the SW-Step 1+ 62 input, the inverter will continue to accelerate up the Acceleration 420 ramp.
Acceleration can be interrupted by switching off the signal at the (SOSP) Acceleration 62 input. If the signal
remains applied to the SW-Step 1+ 68 input, the inverter will save the current frequency reference value to
memory. The acceleration operation can be continued at any time until the Maximum frequency 419 parameter
value is reached.
The signal applied to the SW-Step 1+ 68 input must be switched off to start decelerating. The inverter will then
reduce its frequency down the Deceleration 421 ramp. If the SW-Step 1+ 68 input is activated once more,
the inverter will save the current frequency to memory, but only if it is still higher than the Minimum frequency
418 parameter value. If the current value is lower than the Minimum frequency 418 parameter value, the inver‐
ter will accelerate to the Minimum frequency 418 parameter value. Frequency values between 0 and
Minimum frequency 418 cannot be achieved with this setpoint value control when the drive is stationary.
If the SW-Step 1+ 68 signal remains switched off, the inverter will reach zero frequency and switch off the output
stage.
If a signal is applied for the opposite direction SW-Step 1- 69 before zero is reached, the inverter will accelerate
in the opposite direction after reaching 0 without switching off the "Release brake signal".
The "–" direction of rotation works in the same way.
If both SW-Step 1+ 68 and SW-Step 1- 69 inputs are activated simultaneously, the inverter will evaluate this
status as an invalid setpoint value. This response corresponds to the status as though neither of the inputs were
active.
3 SOST step 2 481 frequency value
4 SOST step 1 480 frequency value
69