Speed Search - YASKAWA CIMR-F7A Instruction Manual

Con-
Name
stant
Number
Sets the time required to return
the Inverter output voltage to
normal voltage at the comple-
Voltage tion of a speed search, in units of
L2-04
recovery time one second.
Sets the time required to recover
from 0 V to the maximum volt-
age.
Sets the main circuit undervolt-
age (UV) detection level (main
circuit DC voltage) in V units.
Undervolt-
Usually setting is not necessary.
L2-05 age detection
Insert an AC reactor in the
level
Inverter input side to lower the
main circuit undervoltage detec-
tion level.
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 11 kW.
* 1. The factory settings depend on the Inverter capacity. The values for a 200 V Class Inverter of 0.4 kW are given.
* 2. These are values for a 200 V Class Inverter. Values for a 400 V Class Inverter are double.
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 on inertia, and then starts
smoothly from that speed. When restoring power after a temporary power loss, the speed search function
switches the connection from the commercial power supply, and then restarts the fan that is rotating on inertia.
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.
IMPORTANT
• 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 b1-01, speed calculation or current detection, will be performed.
Setting
Description
Range
0.0 to
5.0
150 to
210
*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-
Control Methods
Change
Open
Factory during
V/f
Loop
Setting Opera-
V/f with
Vec-
tion
PG
0.3 s
No A A
*1
190 V
No A A
*2
Continuing Operation
MEMO
BUS
Flux
Regis-
Vec-
ter
tor
tor
A A 488H
A A 489H
6-
67