Toshiba 48-1250 A 用户手册

The TX can be configured to accept a tachometer
feedback signal through the 4-20mA input and has two
options available for scaling the tachometer input.  Note:
At the time of this printing, SP6.1 - SP6.4 are pending.

The first screen of setpoint page 6 is
TACHOMETER SCALE SELECTION.  When
this is set to AUTO, the display prompts the
user to program the TX to sense when the
motor speed is zero.  It will prompt again when
the motor speed is at maximum RPM.  Once
these inputs are given, the TX  automatically
scales the range of the tachometer feedback to
give a linear RPM ramp.  When this is set to
MANUAL, the user will need to input the
tachometer scale of the 4-20mA input range.

• Press Enter if Motor Speed = 0 RPM:  This

setpoint will be displayed when the user has
selected Auto Scaling Mode.  The TX is
prompting the user to program when the motor
speed is at zero.  This will be the lowest value
on the scale.

• Press Enter if Motor Speed = MAX RPM: The

TX is now prompting the user to program the
unit when the motor is at maximum speed.  This
will be the highest value on the scale.

• Press Enter to Scale: This is a prompt to the

user that the unit has recorded the values of the
tachometer input based on input from the user
and is now ready to automatically scale the range
of the tachometer input.

• Manual Tach Scale 4.0 mA: The unit is looking

for an RPM value to assign to the lowest point on
the scale.  This value should represent the
motor at zero speed.

• Manual Tach Scale 20.0 mA: The unit is looking

for an RPM value to assign to the highest point
on the scale.  This value should represent the
motor at full speed.

Feedback Ramp Time: This is the duration of
the tachometer ramp time.

Tach Accel Trip: The maximum allowed
percentage of slip per NEMA design of the motor.

Tach Accel Trip Delay: The duration of time that
the Tach Accel trip condition must persist before
a trip is generated.

The TX provides two 4-20mA analog outputs.
Each analog output is independent of the other
and can be assigned to monitor different
functions.  The available output ranges are
RPM, Hottest Non-Stator (Bearing) RTD,
Hottest Stator RTD, RMS current, or % Motor
Load.

• Analog Output #1 – Select a function from the

available five options to be transmitted from the
4-20mA output.  Note: If selecting RPM, the
Tachometer feedback input signal must be
present in order for the TX to give proper
output.  If selecting RTD, the RTD option must
be installed and an RTD input signal must be
present for a proper output to be given from the
analog output.

• Analog Output #1 4 mA: Enter a value that the

4mA level will represent for the selected
function;  typically this value should be 0.

• Analog Output #1 20 mA: Enter a value that the

20mA level will represent for the selected
function.

Analog Output #2 – All of the setpoints and
setup screens for Analog Output #2 are the
same as those for Analog Output #1.