Speed Search - Omron I537-E2-01 User Manual

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Speed Search

The speed search function finds the actual speed of a motor that is coasting without control and then starts
smoothly from that speed. It is also activated after momentary power loss detection when L2-01 is set to
enabled.
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Related Parameters
Param-
eter-
Number
Speed search selection
b3-01
Speed search operating
current (current detec-
b3-02
Speed search decelera-
tion time (current detec-
b3-03
Speed search wait time
b3-05
L2-03
Voltage recovery time
L2-04
* 1. The factory setting will change when the control method is changed. (Open loop vector control factory settings are given.)
* 2. Factory settings depend on Inverter capacity. (The values shown are for a 200 V Class Inverter for 0.4 kW.)
-38
6
Name
LCD Display
Enables/disables the speed search function for the RUN com-
mand and sets the speed search method.
(current detection or
0: Disabled, speed calculation
speed calculation)
1: Enabled, speed calculation
2: Disabled, current detection
3: Enabled, current detection
Speed Calculation
When the search is started, the motor speed is calculated and
acceleration/deceleration is performed from the calculated
speed to the specified frequency (motor direction is also sear-
Slip Comp Gain
ched).
Current Detection
The speed search is started from the frequency when power
was momentarily lost or the maximum frequency and the
speed is detected when the set search current level is reached.
Sets the speed search operation current as a percentage, taking
tion)
the Inverter rated current as 100%.
Not usually necessary to set. When restarting is not possible
SpdSrch Current with the factory settings, reduce the value.
Sets the output frequency deceleration time during speed
tion) search.
Set the time for deceleration from the maximum output fre-
SpdSrch Dec Time quency to the minimum output frequency.
(current detection or Sets the contactor operating delay time when there is a contac-
speed calculation) tor on the output side of the Inverter. When a speed search is
performed after recovering from a momentary power loss, the
Search Delay search operation is delayed by the time set here.
Sets the Inverter's minimum baseblock time, when the inverter
Min. baseblock time
is restarted after power loss ridethrough.
Sets the time to approximately 0.7 times the motor secondary
circuit time parameter.
PwrL Baseblock t
If an overcurrent or undercurrent occurs when starting a speed
search or DC injection braking, increase the set values.
Sets the time required to return the Inverter output voltage to
normal voltage at the completion of a speed search.
Sets the time required to recover from 0 V to the maximum
PwrL V/f Ramp t
voltage.
Setting
Description
Range
0 to 4
0.1 to
0.0 to
0.1 to 5.0
0.0 to
Change
Factory during Access
Setting Opera- Level
tion
*1
No A
2
0 to
120% No A
200
2.0 s No A
10.0
0.2 s No A
20.0
*1
No A
0.1 s
*2
No A
0.3 s
5.0