gefran VDI100 Series User Manual

Speed Search from Multi-function digital inputs
Set the multi-function digital input to external speed search command 1 or 2. External speed search command
1 (value = 19) and 2 (value = 34) cannot be set at the same time, otherwise “SE02” (digital input terminal error)
warning occurs.
Speed search function must be enabled before applying the run command to ensure proper operation. See
relay logic in gure 4.4.64.
Figure4.4.64Speedsearchandoperationcommands
Ry1
Ry2
Rv1
Speed search command
Run command
Notes: Speed Search Operation
- The speed search cannot be used when the motor rated power is greater than the inverter rated power.
- The speed search cannot be used when the motor rated power is two inverter sizes smaller than the invert-
er currently used.
- The speed search cannot be used in combination with a high-speed motor.
- In V / F mode, it is necessary to perform a static auto-tune.
- In SLV mode, it is necessary to perform a rotational auto-tune. Perform a static auto-tune when using long
motor leads.
Speed search uses current detecting. Use parameter 07-24 to select detection direction.
07-19: Speed Direction Search Operating Current
- Used in bidirectional speed search only (07-24 = 1).
- Set bidirectional current level.
- Increase value if speed search is not successful at low speeds (above 5Hz)
Note: If value is too high may cause DC braking effect.
07-20: Speed Search Operating Current
- Can be used for bidirectional (07-24 = 1) or unidirectional (07-24 = 0) speed search.
- Sets speed search current Level.
- The set value must be lower than the excitation current (02-09) and must equal to the no-load current. If the
no-load current is unknown it is recommended to set value at 20%.
- Excessive speed search current will cause inverter output to saturate.
- It is recommended to use speed search in case of a momentary power loss. Increase the minimum base
block time (07-18) in case of an over-current condition.
07-21: Integral time of speed searching
- Can be used for bidirectional (07-24 = 1) or unidirectional (07-24 = 0) speed search.
- Set the integral time during speed search.
- If OV occurs, increase the set value to increase the speed search time. Decrease the value if a quick start is
required
07-22: Delay time of speed searching
- Use delay time when using a contactor on the inverter output side.
- The inverter speed search starts after the delay time expires.
- Speed search delay time is disabled when set to 0.0 sec. (07-22 = 0.0)
07-23: Voltage recovery time
- Sets the voltage recovery time.
- Sets the time for the inverter to restore the output voltage from 0V to the specied V/f level after speed
search function is completed.
07-24: Direction-Detection Speed Search Selection
0: Disable Direction-Detection Speed Search
198 VDI100 • Instruction manual

gefran VDI100 Series Specifications

General

Brand	gefran
Model	VDI100 Series
Category	Inverter
Language	English