TOSHIBA- 49
TX Series 48 - 1250A
SP.8 Overload Curve Configuration (Setpoint Page 8)
(Security Level: 3)
MENU
PAGE 8 OVERLOAD
CURVE CONFIGURATION
BASIC RUN
OVERLOAD CURVE
(Hit DOWN ARROW seven times)
RUN CURVE LOCKED
ROTOR TIME: O/L CLASS
Range: 1 - 30 SEC, O/L CLASS
RUN LOCKED ROTOR
CURRENT: 600% FLA
BASIC START
OVERLOAD CURVE
AREA UNDER CURVE
PROTECTION: DISABLED
CURRENT OVER
CURVE: DISABLED
Range: ENABLED or DISABLED
Options: DISABLED, LEARN
or ENABLED
COAST DOWN TIMER
TIME: DISABLED
START CURVE LOCKED
ROTOR TIME: O/L CLASS
NUMBER OF STARTS PER
HOUR: DISABLED
TIME BETWEEN STARTS
TIME: DISABLED
MAX I*I*T START
: 368 FLA*FLA*SEC
ACCELERATION TIME
LIMIT: 30 SEC
LEARNED START CURVE
BIAS: 10%
Range:1 - 60 MIN, DISABLED
Increments of 1
Range:1 - 30 SEC, O/L CLASS
Increments of 1
Range:1 - 300 SEC, DISABLED
Increments of 1
Range: 1 - 6, DISABLED
Increments of 1
Range:1 - 60 MIN, DISABLED
Increments of 1
Range:1 - 2500, FLA*Time (Sec)
Increments of 1
Range: 5 - 40%
Increments of 1
START LOCKED ROTOR
CURRENT: 600% FLA
TIME FOR SAMPLING
: 30 SEC
Range: 400 - 800%
Increments of 10
Range: 1 - 300 SEC
Increments of 1
Range: 400 - 800%
Increments of 1
Configures the unit’s start and run
protection mode. The unit has
independent start and run curve
protection and the settings can be
based on the OL Class or set by the
motor’s locked rotor current and time.
SP8.1 Basic Run Overload Curve
• Run Curve Locked Rotor
Time: Set the locked rotor
time to the OL Class default
chosen in Setpoint Page 1 or
set the time in seconds.
This is the time the locked
rotor condition exists before a
trip occurs.
• Run Locked Rotor Current:
The current the motor draws
with full voltage on the
windings and no rotor
movement (as a percent of
motor FLA). Refer to the
nameplate data or contact the
motor manufacturer.
• Coast Down Timer: If
enabled, this prevents the
motor from restarting for the
programmed amount of time,
after a stop command is
given.
SP8.2 Basic Start Overload Curve
• Start Curve Locked Rotor Time: The locked rotor
time can be set to the OL Class default chosen in
Setpoint Page 1 or to a specific time. The
overload condition must exist for the programmed
amount of time before a trip occurs.
• Start Locked Rotor Current: The current the
motor draws with full voltage on the windings and
no motor movement (as a percent of motor FLA).
Refer to the motor nameplate data or contact the
motor manufacturer. See Appendix A.
• Acceleration Time Limit: If the motor does not
enter run mode (reach at speed) within the preset
time, the unit trips on acceleration time limit.
• Number of Starts per hour: If enabled, this limits
the maximum number of starts permitted per hour.
This setpoint allows a maximum of 6 starts per
hour. Contact motor manufacturer.
• Time Between Starts: If enabled, the TX
prevents another start attempt until the
programmed time has expired.
SP8.3 Area Under Curve Protection: If enabled,
this secondary start protection uses both the
basic start protection and the area under the
curve protection.
• Max I*I*T Start: The maximum I
2
T allowed
during start. If the I
2
T to start exceeds this
number then the TX will generate a trip.
SP8.4 Current Over Curve: Learns the motor’s
starting characteristics and protects the motor
based upon the learned curve. It is useful
when commissioning a new motor.
• Learn: The unit reads the motor’s starting
characteristics. Start the motor and allow it
to come to full speed. The start feedback
enables the motor protection based on the
learned start curve.
• Learned Start Curve Basis: The maximum
allowed deviation above or below the start
curve before a trip is generated.
• Time for Sampling: The time the TX
continues to sample the start curve
characteristic during learn the mode.
