Digital Gauges: Frequently Asked Questions

This section explains how to connect to the terminal block. Please refer to the instruction manual for further details.

 

 

(1) Connecting to the cable

The terminal block uses M3.5 screws. We recommend using round crimp terminals that are compatible with these screws.

 

(2) Grounding

For safety and noise reduction, be sure to ground the grounding terminal (no. 3). Use a single-point grounding at the grounding terminal; do not use connecting wires.

Grounding type: 3rd class grounding or higher (100Ω or less)
Grounding wire: Soft copper wire of 2mm² or larger (AWG14)
Grounding extension: max. 20m

 

(3) Connection of relay output

When connecting inductive loads (such as relays) to the relay outputs (No. 10-15) on the rear panel, use a protection circuit to keep back electromotive force low and prevent damage to the relay contacts.

 

 

The guidelines for c and r are

c: 0.5 to 1 μF for a contact current of 1 A
r: 0.5 to 1Ω for a contact voltage of 1V

However, this is not always the case due to variations in load characteristics and relay characteristics. Please verify this experimentally, considering that c is responsible for suppressing discharge when the contact is opened, and r is responsible for limiting the current when the contact is closed again. Use a capacitor with a voltage rating of 100V to 300V for c. Use an AC capacitor (non-polarized) in AC circuits. If the load is a relay or solenoid, the recovery time will be delayed.

 

(4) Connection of external devices

When inputting preset gate signals, hold signals, and reset signals from external devices, connect the signals to the terminal block on the rear panel.
Please refer to the timing chart for the DG4280 terminal block input signals.​

 

(5) Installation of terminal block cover (optional)

Terminal block covers (DG0420 type) are available.

 

(6) Connecting the GS sensor and BCD signal cable

Connect as shown in the diagram below. A signal cable for the BCD connector, type AA8107 (3m long, open on one end), is available as an option.
For information regarding BCD OUT, please refer to the DG4280 BCD out specifications.