YASKAWA Varispeed G7 Series Instruction Manual page 301

Multi-function Contact Inputs (H1-01 to H1-10)
Set-
ting
Value
61 External search command 1 (ON: Speed search from maximum output frequency)
62 External search command 2 (ON: Speed search from set frequency)
Setting Precautions
When both external search commands 1 and 2 are set for the multi-function contact terminals, an OPE03
•
(invalid multi-function input selection) operation error may occur. Set either external search command 1 or
external search command 2.
If speed search during startup is selected when using V/f control with PG, the Unit will start from the fre-
•
quency detected by PG.
If performing speed search using external search commands, add an external sequence so that the period
•
when the Run Command and external search command are both ON is at the very least the Minimum
Baseblock Time (L2-03).
When a multi-function contact input (H1-01 to H1-10) is set to 61 or 62 and b3-01 (Speed Search Selec-
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tion) (current detection or speed calculation) is set to 1 or 3, b3-01 is given priority for the starting search.
If the Inverter output is equipped with a contact, set the contact operation delay time in the Speed Search
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Wait Time (b3-05). The factory setting is 0.2 s. When not using the contact, you can reduce the search time
by making the setting 0.0 s. After waiting for the speed search wait time, the Inverter starts the speed
search.
Constant b3-02 is a current detection speed search (current detection level for search completion). When
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the current falls below the detection level, the speed search is viewed as completed, and the motor acceler-
ates or decelerates to the set frequency. If a motor overload (OL1) or an Inverter overload (OL2) occurs
and the motor cannot restart, lower the set value.
If an overcurrent (OC) is detected when using speed search after recovery following a power loss, lengthen
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the Minimum Baseblock Time (L2-03).
If a main circuit over voltage (OV) is detected when using a current detection speed search after a momen-
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tary power loss, lengthen the Speed search detection time (b3-03).
Application Precautions for Speed Searches Using Estimated Speed
When using V/f control with or without a PG, always perform stationary autotuning for only line-to-line
•
resistance before using speed searches based on estimated speeds.
When using vector control, always perform rotational or stationary autotuning (not stationary autotuning
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for line-to-line resistance only) before using speed searches based on estimated speeds.
If the cable length between the motor and Inverter is changed after autotuning has been performed, per-
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form stationary autotuning for line-to-line resistance only again.
The speed estimation speed search may not be able to correctly estimate the speed if the wiring is long.
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The current detection speed search is recommended in this case.
IMPORTANT
-68
6
Function
The motor will not operate when stationary autotuning or stationary autotuning for line-to-line
resistance only is performed.
Control Methods
Open Open
V/f Loop Flux Loop
V/f with Vec- Vec- Vec-
PG tor tor tor
1 2
Yes No Yes No Yes
Yes No Yes No Yes