Omron SYSDRIVE 3G3RV, User Manual

Page: 269 / 446

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