Using Intelligent Output Terminals
Oper
ations
a
nd Moni
tor
ing
4–48
Over-torque
Signal
The Over-torque function [OTQ] turns ON when the estimated value of output torque of motor
increases more than the arbitrary level set for the output (see table below). Recall that the
torque limit function, covered in
“Torque Limit” on page 4–30
, actually limits the torque
during certain operating conditions. Instead, the over-torque output feature only monitors the
torque, turning ON output [OTQ] if the torque is above programmable thresholds you set. The
[OTQ] function is valid only for sensorless vector control, 0-Hz domain sensorless vector
control, or vector control with sensor. Do not use the [OTQ] output except for these inverter
operational modes.
The assignment of the Over-torque function to an output terminal [OTQ] is detailed in the table
at the left.
Instantaneous
Power Failure /
Under-voltage
Signal
An instantaneous power failure (complete loss) or under-voltage condition (partial loss) of
inverter input voltage can occur without warning. SJ700
2
Series inverters can be configured to
respond to these conditions in different ways. You can select whether the inverter trips or retries
(restart attempt) when an instantaneous power failure or under-voltage condition occurs. You
can select the retry function with parameter B001.
When enabled, the Retry Function operates in the following ways:
Under-voltage conditions
– When an instantaneous power failure or under-voltage condition
occurs, the inverter will attempt to restart up to 16 times. A trip condition will occur on the 17th
attempt, which must be cleared with the Stop/Reset key. When connecting control power
supply terminals [Ro]–[To] to the DC bus [P]–[N], an under-voltage may be detected at power-
off and cause a trip. If this is undesirable, set B004 to 00 or 02.
Over-current/voltage conditions
– When retry function is selected and an over-current or an
over-voltage condition occurs, a restart is attempted 3 times. A trip will occur on the 4th failed
restart attempt. Use parameter B004 to select the trip and alarm response to instantaneous
power failure and under-voltage conditions.
If an over-voltage or over-current trip occurs during the deceleration and an instantaneous
power failure error (E16) is displayed the inverter goes into free-run stop. In this case make the
deceleration time longer.
Opt. Code
07
Symbol
[OTQ]
Valid for
Outputs
[11 to [15],
[ALx]
Required
Settings
C055, C056,
C057, C058
A044 = 03 or
04 or 05
Default
terminals
[14]
Code
Function/Description
Data or Range
C055
Over-torque, forward-driving level setting
0 to 200%
C056
Over-torque, reverse-regenerating, level setting
0 to 200%
C057
Over-torque, reverse-driving, level setting
0 to 200%
C058
Over-torque, forward-regenerating, level setting
0 to 200%
C021 to C025
Intelligent output terminal [11] to [15] function
07
Opt. Code
and
Symbol
08=[IP]
09=[UV]
Valid for
Outputs
[11 to [15],
[ALx]
Required
Settings
B001, B002,
B003, B004,
B005, B007
Default
terminals
Requires
config.
Symbol
Function Name
Description
IP
Instantaneous Power Failure
ON when the inverter detects a loss of input
power
UV
Under-voltage condition
ON when the inverter input power is less
than the specified input range
