Sonic Alert DCP301 user manual Handling Precautions, Input 1 Zener barrier adjustment

Chapter 7. PARAMETER SETUP

●C q 1 (Input 1 Zener barrier adjustment)

The following adjustment must be made when using a Zener barrier.

(1)Turn the DCP301 OFF. When you have finished mounting and wiring the DCP301, short-circuit across A and B on the terminals of the RTD.

Zener barrier

Zener barrier

Short-circuit

Zener barrier

C

B

A

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33

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DCP301

(2)Turn the DCP301 ON again, and set setup data C q 0 setting to 241. For details on how to change settings, see 7-1 Parameter Setup (page 7-1).

(3)Display the setup data C q 1 setting.

(4)Press ENT to display the difference (A—B) between the resistances of the Zener bar- rier connected to leads A and B on the lower display.

(5)Press ENT to memorize the difference (A—B) between the resistances to the control- ler.

(6)Press DISP to set the DCP301 to the basic display state.

(7)Turn the power OFF, and remove the short across A and B.

Handling Precautions

• The resistance error of the Zener barrier connected to leads A and B cannot be adjusted unless it is 20Ω or less.

•This adjustment is not required when a Zener barrier and an input other than an RTD are not used.

•Once the Zener barrier has been adjusted, compensation is carried out on the Zener barrier. When using on an RTD without a Zener barrier, re-adjust without the Zener barrier.

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