Frequently Asked Questions about the Tachometer

This is the method for setting up a reflective sticker on the rotation axis to be detected by the LG-916 and to display the rotation speed at ○○○○ r/min.

The TM-2100 series (TM-2110, TM-2120, TM-2130, TM-2140) is set up by pulling out the internal components as shown in Figure 2. First, please complete the setup of the TM-2100 series. The connection of the power cable and signal lines should be done after the setup.

■Signal cable connection with LG-916

Connect using the signal cable MX-705 (5m) as shown in the next figure. If a longer cable is needed, it can be manufactured to the specified length.

Figure 1

Settings of the TM-2100 series tachometer.

Refer to Figure 2 to set 1 to 4. I will provide additional explanations regarding the meaning of the settings. For detailed explanations of the functions, please refer to the instruction manual.
To display "○○○○r/min" on the LG-916 + TM-2100 series, set the multiplier/exponent to "6.0000×10" and without a decimal point.

Figure 2

• AC-DC settings
  The signal from LG-9 will be a high-level square wave of 5V, so it is set to "DC". Generally, if the signal is a square wave, it is set to "DC", and if it is a sine wave, it is set to "AC".
• Voltage Input, Filter
  Since the signal of LG-9 is a square wave voltage, set "Bit 1: OFF (Voltage Input Side)" and "Bit 2: OFF (Filter OFF)". Please set "Bit 3, 4: OFF" (these are unused switches). For open collector signals, set "Bit 1: ON (Contact Input Side)" and also "Bit 2: OFF (No Filter)". For contact input, set "Bit 1: ON (Contact Input Side)" and to prevent contact chattering, set "Bit 2: ON (With Filter)".
• How to find coefficients (multipliers × exponents)

  

  Set bits 3, 4, and 5 to 'OFF' (exponent = 10). Also, set bits 6, 7, and 8 to 'OFF' (no decimal point ○○○○). It is possible to set up to 3 decimal places. Set the rotary switch to '60000' (multiplier = 6.0000).

• Wide Range
  When Bit 1 is set to "ON", it operates in wide range mode, measuring from a minimum range of 0.1Hz (6 r/min). During stop, it may take up to about 20 seconds of measurement time for the display to reach 0 in order to determine 0.1Hz. When Bit 1 is set to "OFF", the minimum measurement range starts from 1Hz (60 r/min) or higher, and the display will reach 0 in about 1 second during stop.
  Please also set Bit 2 to "OFF" (this is an unused switch).