YOKOGAWA EXA DO402G, Руководство пользователя

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<3. Installation and Wiring>
3-11
IM 12J05D02-01E
Default settings
• The contact S1 is pre-programmed for high alarm function.
• The contact S2 is pre-programmed for a low alarm function.
• The contact S3 is pre-programmed for wash function.
• The contact S4 is pre-programmed for FAIL.
The three control contacts (S1 to S3) can be used for simple process control by programming
their function (Chapter 5). The FAIL contact is programmed to signal a fault in the measuring
loop. Always connect the FAIL contact to an alarm device such as a warning light, sound
annunciator, or alarm panel to make full use of the fault detection possibilities (self diagnostics) of
the EXA converter.
When using ON/OFF signals whose voltage is 3.3 VAC or 70 VDC or higher, use 2.5 mm
2
(AWG14) wires. If using voltages lower these voltages, select wires in the range of 0.13 to 2.5
mm
2
(AWG26 to AWG14) according to the current capacity of the connected load.
Use cables that comply with UL2556VM-1 or equivalent and whose outer diameter is 6 to 12 mm.
Tighten the cables to 0.5 N•m torque.
3.4.3 Contact input
Voltage-free contact (do not apply voltage)
Wash start or input remote range change (either choice)
It is necessary to use screening/shielding on the output signal cables. Screw (M3) 23 is used to
connect the shielding.
On resistance: 10 Ω or less
Off resistance: 100 kΩ or more
Select wires in the range of 0.13 to 2.5 mm
2
(AWG26 to AWG14) according to the current
capacity of the connected load.
Use cables that comply with UL2556VM-1 or equivalent and whose outer diameter is 6 to 12 mm.
Tighten the cables to 0.5 N•m torque.
3.5 Wiring the analog output signals
3.5.1 General precautions
The analog output signals of the EXA transmit low power standard industry signals to peripherals
like control systems or strip-chart recorders (Figure 3.8).
Do not apply voltage.
Select wires in the range of 0.13 to 2.5 mm
2
(AWG26 to AWG14) according to the current
capacity of the connected load.
Use cables that comply with UL2556VM-1 or equivalent and whose outer diameter is 6 to 12 mm.
Tighten the cables to 0.5 N•m torque.
We recommend that the cables be terminated with pin terminals (see figure 3.6).
9th Edition: Aug. 05, 2015-00