Speed Search - Omron SYSDRIVE 3G3RV Series User Manual

If the momentary power loss operation selection is set to 0 (Disabled), when the momentary power loss
•
exceeds 15 ms during operation, alarm UV1 (main circuit undervoltage) will be detected.
K K K K

Speed Search

The speed search function finds the actual speed of the motor that is rotating using inertia, and then starts
smoothly from that speed. When restoring power after a temporary power loss, the speed search function
switches connection from the commercial power supply, and then restarts, for example, a fan that is rotating
due to the mechanical inertia.
nRelated Parameters
Name
Param-
eter
LCD Dis-
Num-
play
ber
Enables/disables the speed search function for the run com-
Speed search
mand and sets the speed search method.
selection (cur-
0: Disabled, speed calculation
rent detection
1: Enabled, speed calculation
or speed cal-
2: Disabled, current detection
culation)
3: Enabled, current detection
Speed Calculation
b3-01 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
searched).
Slip Comp
Current Detection
Gain
The speed search is started from the frequency when power
was momentarily lost and the maximum frequency, and the
speed is detected at the search current level.
Speed search
operating cur-
Sets the speed search operation current as a percentage, taking
rent (current
the Inverter rated current as 100%.
b3-02
detection)
Not usually necessary to set. When restarting is not possible
with the factory settings, reduce the value.
Spd Srch Cur-
rent
Speed search
deceleration
Sets the output frequency deceleration time during speed
time (current
search in 1-second units.
b3-03 detection)
Set the time for deceleration from the maximum output fre-
quency to the minimum output frequency.
SpdSrch Dec
time
Speed search
wait time
Sets the contactor operating delay time when there is a contac-
(current
detection or tor on the output side of the Inverter. When a speed search is
b3-05
performed after recovering from a momentary power loss, the
speed calcula-
search operation is delayed by the time set here.
tion)
Search Delay
Min. base- Sets the Inverter's minimum baseblock time in units of one sec-
block time ond, when the inverter is restarted after power loss ridethrough.
Sets the time to approximately 0.7 times the motor secondary
L2-03
circuit time constant.
PwrL Base-
If an overcurrent or undercurrent occurs when starting a speed
block t
search or DC injection braking, increase the set values.
Voltage Sets the time required to return the Inverter output voltage to
recovery time normal voltage at the completion of a speed search, in units of
L2-04 one second.
PwrL V/F
Sets the time required to recover from 0 V to the maximum
Ramp t
voltage.
* 1. The factory setting will change when the control method is changed. (V/f 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.)
Description
Continuing Operation
Control Methods
Change
Setting Factory during
Range Setting Opera-
V/f
tion
*1
0 to 3 No A
2
0 to
120% No A
200
0.1 to
2.0 s No A
10.0
0.0 to
0.2 s No A
20.0
*2
0.1 to 5.0 No A
0.1 s
0.0 to
*2
No A
0.3 s
5.0
Open
V/f
Loop
with
Vec-
PG
tor
A A
No A
No A
A A
A A
A A
53
6-