Speed Search - Omron VARISPEED G7 Instruction Manual

Con-
stant
Number
L2-05
* 1. Factory settings depend on Inverter capacity. (The values shown are for a 200 V Class Inverter for 0.4 kW.)
* 2. These values are for a 200 V Class Inverter. For a 400 V Class Inverter, double the values.
Setting Precautions
Error output signals are not output during momentary power loss recovery.
•
To continue Inverter operation after power has been restored, make settings so that run commands from the
•
control main circuit terminal are stored even while power is suspended.
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.

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 the fan that is rotating using inertia.
Related Constants
Con-
stant
Number
b3-01
-56
6
Name
Description
Display
Undervolt- Sets the main circuit undervoltage
age detection (UV) detection level (main circuit
level DC voltage) in V units.
Usually setting is not necessary.
Insert an AC reactor in the Inverter
PUV Det
input side to lower the main circuit
Level
undervoltage detection level.
Name
Description
Display
Speed search Enables/disables the speed search
selection (cur- function for the run command and
rent detection sets the speed search method.
or speed cal- 0:Disabled, speed calculation
culation) 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
SpdSrch at
(motor direction is also searched).
Start
Current Detection:
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.
Change
Setting Factory during
Range Setting Opera-
V/f
tion
150 to
190 V
No A
210
*2
*2
Change
Setting Factory during
Range Setting Opera-
V/f
tion
*1
0 to 3 No A
2
Control Methods
Open Open
V/f Flux
Loop Loop
with Vec-
Vector Vector
PG tor
1 2
A A A A
Control Methods
Open Open
V/f Flux
Loop Loop
with Vec-
Vector Vector
PG tor
1 2
A A No A