Hitachi L300P User Manual
Page 163
L300P Inverter
Oper
ati
ons
and Monitor
ing
4–33
The figure below shows the operation during an overload restriction event. The overload
restriction level is set by B022 and B025. The overload restriction constant is the time to decel-
erate to 0Hz from maximum frequency. When this function operates, the acceleration time will
be longer than the normal acceleration time.
NOTE: The Overload Advance Notice function for intelligent outputs is related to Overload
Restriction operation, discussed in
“Overload Advance Notice Signal” on page 4–39
.
Valid for inputs:
C001, C002, C003, C004,
C005
Required
settings:
B021, B022, B023 (Mode 1),
B024, B025, B026 (Mode 2)
Notes:
• If the overload restriction constant (B023 or
B026) is set too short, an over-voltage trip
during deceleration will occur due to regener-
ative energy from the motor.
• When an overload restriction occurs during
acceleration, the motor will take longer to
reach the target frequency, or may not reach
it. The inverter will make the following
adjustments:
a) Increase the acceleration time
b) Raise torque boost
c) Raise overload restriction level
Opt.
Code
Symbol
Function Name
Input
State
Description
5
3
1
4
2
FW
TH
PLC
P24
CM1
See I/O specs on page
OLR
Example (requires input configuration—
see page
Overload
restriction level
Maximum
frequency
Output
frequency
Target frequency
Deceleration rate at overload restriction
Deceleration rate
at overload restriction
A004
F001
B022 / B025
B023 / B026
B022 / B025
t