Omron VARISPEED E7 User Manual page 178

Multi-function Digital Inputs
Set Value
External search command 1
OFF: Speed search disabled (Start from lowest output frequency)
61
ON: Speed calculation (Calculates the motor speed, and starts search from calculated speed)
Current detection (Starts speed search from maximum output frequency)
External search command 2
OFF: Speed search disabled (Start from lowest output frequency)
62
ON: Speed calculation (Calculates the motor speed, and starts search from calculated speed) (Same operation as
external search command 1)
Current detection: Starts speed search from set frequency (reference frequency when search command was input).
External seach command 3
64 OFF: Inverter is base blocked
ON: Inverter starts operation using speed search (same operation as speed search 2)
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 will occur. Set either external search command 1 or
external search command 2.
If performing speed search using external search commands, design the control circuit so that the run com-
•
mand and external search command are both ON. These two commands must be kept on, at least for the
time set in parameter L2-03.
If the Inverter output is equipped with a contactor, set the contactor operation delay time in the Speed
•
Search Wait Time (b3-05). The factory setting is 0.2 s. When not using a contactor, you can reduce the
search time to 0.0 s. After waiting for the speed search wait time, the Inverter starts the speed search.
Parameter b3-02 (current detection level for search completion) is effective only when current detection
•
speed search is selected. When the current falls below the detection level, the speed search is supposed to
be completed, and the motor accelerates or decelerates to the set frequency.
If an overcurrent (OC) is detected when using speed search after power recovery, lengthen the Minimum
•
Baseblock Time (L2-03).
Application Precautions for Speed Searches Using Estimated Speed
Always perform non-rotating autotuning for line-to-line resistance before using speed searches based on
•
calculated speeds.
If the cable length between the motor and Inverter is changed after autotuning has been performed, per-
•
form stationary autotuning for line-to-line resistance again.
Function
6
39
6-