Table of Contents
Advertisement
Undervoltage detection--(LU)
(Function code data = 3)
This signal is turned on when the DC link circuit voltage of the inverter drops be-
low the specified level or when the motor stops due to activation of the undervolt-
age protection feature (undervoltage trip). It is turned off if the DC link circuit volt-
age exceeds the specified level.
Torque limiting (Current limiting)--(IOL)
(Function code data = 5)
This signal is turned on when the inverter is limiting the motor drive current by ac-
tivating the current limiter of either software (F43: Operation condition, F44: Limit-
ing level) or hardware (H12 = 1: Active). The minimum ON-duration is 100 ms.
Auto-restart after recovery of power--(IPF)
(Function code data = 6)
This signal is turned on during the period from when the inverter detects the un-
dervoltage of the DC link circuit and stops the output (if auto-restart after recovery
of power is selected (F14 = 4 or 5)) until auto-restarting (the output frequency has
recovered up to the set frequency). At that moment of auto-restarting, this signal is
turned off.
Motor overload early warning--(OL)
(Function code data = 7)
This signal is used to issue a motor overload early warning for enabling you to
take corrective action before the inverter detects a motor overload (
and stops its output.
The motor temperature characteristics are specified by function codes F10 (Elec-
tronic thermal selection) and F12 (Thermal time constant). If a value calculated
from the settings of F10 and F12 exceeds the detection level of the early warning
set by function code E34, then this signal is turned on. Normally, the recom-
mended set current level for E34 is 80 to 90% of the allowable continuous load
current set by function code F11.
Function code E34 is effective for not only the motor overload early
warning (OL), but also for the operation level of the current detection (ID)
and low level current detection (IDL).
Retry in operation--(TRY)
(Function code data = 26)
This signal is turned on when the retry function specified by function codes H04
(Number of retries) and H05 (Latency time) is activated. Refer to function codes
H04 and H05 for details of the output timing and number of retries.
Service life alarm--(LIFE)
(Function code data = 30)
This signal is turned on when it is judged that the service life of any of capacitors
(DC bus capacitor and electrolytic capacitor on the printed circuit board) and
cooling fan has expired.
5-35
OL1
alarm)
Advertisement
Chapters
Table of Contents
