(1)If voltage or current exceeding the input allowable voltage or
current is applied to the input terminals, the transducer may be
damaged.
(2)Apply power within the applicable range of the transducer.
Otherwise fire, electric shock or transducer damage may result.
(3)The contents of this instruction manual are subject to change
without prior notice.
(4)This instruction manual is carefully prepared. However, if any
mistake or omission is found, contact your nearest Watanabe
Electric Industry sales agent or Watanabe Electric Industry
directly.
(5)Make this manual available easily anytime.
■Outline
The TW-3K electrically insulates and transducers pulse inputs
into DC voltage or current, then outputs them. The input and
output ranges can be changed by customers by way of the
communication setting. Using a microcomputer circuit, the TW-3K
transducers pulse inputs into standardized signals and outputs
them. The output level can be adjusted using a tactile switch
(within ±5 percent of full scale )on the front panel. The transducer
also incorporates a 12V/30mA power supply for sensors, which is
provided with short-circuit protection. The cut point setting
function can output 0 percent signals when the input level is lower
than a preset value.
■Model and suffix codes to specify
Each code and the standard specifications are as follows.
First check whether or not your desired specifications are correct by
comparing them to the following specifications.
■General specifications
Allowable fluctuation
range for power supply
load
Temperature characteristic
：1.5secnds+one cycle of pulse input
(from 0 to 90%)
：Between the input and output or
power supply, More than 100MΩ
：Between the input and output or
power supply, For 1 min. at 1500V
DC
：Within 110mA (sensor power
supply:30mA)
Operating ambient
temperature/humidity
：-5 to +50℃/Less than 90%RH
(No-condensing）
Storage
temperature/humidity
：-10 to +70℃/Less than 60%RH
■Input type codes
See page 2 for a detailed description of the inputs.
Voltage pulse(0 crossing of the input voltage)
Voltage pulse (Not 0 crossing of the input voltage)
Open collector (detected voltage：5V DC/1mA)
Open collector (detected voltage：12V DC/1mA)
Contact switch (detected voltage：5V DC/1mA)
Contact switch (detected voltage：12V DC/1mA)
*When Code No.C is chosen, measuring range code are 5 to 7.
*When code No.F or G is chosen, measuring range code are 1 to 4.
And measuring range is 0 to 30Hz.
■Measuring range codes
Note: The minimum span for code Y is the same as that for the
code covering the desired measuring range.
■Output type codes and their specifications
*When the input frequency exceeds 100 percent of the full scale,
signals ranging from 105 to 110 percent of the full scale are
output.
For code No. Y limit of specifications
Voltage：0 to 10V in 1V increments
Current：0 to 20mA in 1mA increments
■Output calibration and button lock function
The output signals need to be calibrated using the tactile switch on
the front panel, which is normally prohibited when the button lock
function is in place. Cancel the button lock before calibrating the
output signals.
Canceling the button lock function：Press the SPAN/UP▲ and
ZERO/DOWN▼buttons and hold them for at least 3 seconds, then
release them.
Adjusting the output signals：A signal press of the tactile switch
changes the output by 0.01 percent of the full scale.
Press the switch for at least 300 msec. The output can be changed by
0.1 percent of the full scale by pressing and holding the switch for
over 3 seconds.
Note: When 30 seconds have elapsed without any buttons being
pressed after the button lock has been canceled, the buttons are
automatically locked again. Contact WATANABE to change this
time limit.
When the transducer is to be calibrated for securing prolonged
accuracy, use standard measuring instruments with 10-fold or
greater accuracy compared with the TW-3K.
This marking indicates that
the erroneous operation of
this transducer may result in de
ath or serious
injury.
Ｔ Ｗ － ３ Ｋ － □ □ □ － Ｃ
Input type
Output type
Measuring range
WATANABE ELECTRIC INDUSTRY CO., LTD.
