Speed Search - YASKAWA Varispeed G7 Instruction Manual

Con-
stant
Number
L2-04
L2-05
Note Attach a Backup Capacitor Unit for Momentary Power Loss if compensation for power interruptions of up to 2.0 seconds is required for 200 V/400 V
Class Inverters with outputs of 0.4 to 7.5 kW.
* 1. The factory setting depends on the Inverter capacity. The value for a 200 V Class Inverter of 0.4 kW is given.
* 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.
IMPORTANT
-64
6
Name
Description
Display
Voltage recov- Sets the time required to return
ery time the Inverter output voltage to nor-
mal voltage at the completion of a
speed search, in units of one sec-
ond.
PwrL V/F
Sets the time required to recover
Ramp t
from 0 V to the maximum volt-
age.
Undervoltage Sets the main circuit undervoltage
detection level (UV) detection level (main circuit
DC voltage) in V units.
Usually setting is not necessary.
Insert an AC reactor in the
PUV Det Level
Inverter input side to lower the
main circuit undervoltage detec-
tion level.
Speed search will be performed in the following cases.
• When Momentary power loss detection (L2-01) is set to 1 or 2 (Enabled) and power is restored after
a momentary power loss.
• When Number of auto restart attempts (L5-01) is set from 1 to 10 and the auto restart is performed
after a fault.
• Multi-function contact inputs (H1-
command is sent.
• Multi-function contact inputs (H1-
mand is sent.
The selected speed search type in b3-01, speed calculation or current detection, will be performed.
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0.0 to
0.3 s
No A A
5.0
*1
150 to
190 V
No A A
210
*2
*2
) are set to External search command (61, 62, or 64) and the
) are set to External baseblock (8 or 9) and the release com-
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A A A 488H
A A A 489H