Tachometer Frequently Asked Questions

This is a method for setting up the MP-981 to detect the number of teeth on a gear (60 teeth) and display the rotational speed as ○○○○ r/min.

The TM-2100 series (TM-2110, TM-2120, TM-2130, TM-2140) is configured by pulling out the internal components as shown in Figure 2. First, configure the TM2100 series. Connect the power cable and signal lines after configuration.

■Signal cable connection with MP-981

Connect using the MX-705 signal cable (5m) as shown in Figure 1. Longer cables (over 5m) can be manufactured to your specified length.

Figure 1

■TM-2100 Series Tachometer Settings

Refer to Figure 2 below and set values 1 through 4. Further explanations of the settings are provided below. For detailed explanations of the functions, please refer to the instruction manual.
To display "○○○○r/min" using a gear with 60 teeth + MP-981 + TM-2100 series, set the multiplier and exponent to "1.0000 × 1" and omit the decimal point.

Figure 2

• AC-DC settings
  The signal from the MP-981 is a square wave with a high level of 5V, so set it to "DC". Generally, if the signal is a square wave, set it to "DC", and if it is a sine wave, set it to "AC".
• Voltage input, filter
  Since the MP-981 signal is a square wave voltage, set "Bit 1: OFF (voltage input side)" and "Bit 2: OFF (filter OFF)". Set "Bits 3 and 4: OFF" (these are unused switches). For open collector signals, set "Bit 1: ON (contact input side)" and "Bit 2: OFF (no filter)". For contact inputs, set "Bit 1: ON (contact input side)" and "Bit 2: ON (filter enabled)" to prevent contact chattering.
• How to find the coefficient (multiplier × exponent)

  

  Set "Bit 3, 4: OFF" to "Bit 5: ON" (exponent = 1).
  Also, set bits 6, 7, and 8 to OFF (no decimal point).
  You can set up to 3 decimal places.
  Set rotary switch 4 to "10000" (multiplier = 1.0000).
• Wide range
  When "Bit 1: ON" is selected, the measurement range is wide, and the minimum measurement range starts from 0.1 Hz (0.1 r/min). When stopped, it may take up to approximately 20 seconds for the display to reset to 0 in order to determine 0.1 Hz. When "Bit 1: OFF" is selected, the minimum measurement range starts from 1 Hz (1 r/min) or higher, and when stopped, the display resets to 0 in approximately 1 second.
  Also, please set "Bit 2: OFF" (this is an empty switch).