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Hitachi EH-150 manual External Wiring

Models: EH-150

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5. External Wiring

5. External Wiring

5.1 Resistance Temperature Detective Connection Method and External Wiring

	× b0	× A0
		× A0		A0 to 3 : Current terminal
RTD	× B0			B0 to 3: Current terminal
RTD	× B0	× NC		b0 to 3: Voltage terminal
		× NC
	b1
	×		A1
		×	A1
		×
RTD	B1
RTD	×		NC
		×	NC
		×
	b2
External wiring(Note1)	×	×	A2
Use a shielded cable		×
	×		NC	Make a short-circuit on
			NC	unused channel shown as
		×		unused channel shown as
	× b3			the figure.
	× b3		A3	The temperature data
		×		The temperature data
		×		becomes H7FFF.
				becomes H7FFF.
RTD	× B3	× NC
		× NC
	+24V
	×	-24V
		-24V
		×
Grounding (Note2)
	External power supply
	24VDC

Figure 5.1 External Wiring

Note 1: The external wire length shall be less than 200 m for each channel. In addition, the total resistance of the wires of each channels to be connected to the current terminals (A0 to A3, B0 to B3) shall be less than 400 ohm.

Note 2: Use shielded cable and connect shielded to functional earth on the both sides or one side, which depends on the noise environment.

Note 3: The earth terminal on the power supply module and External power supply 24 VDC must be connected to the functional earth. When functional earth area doesn't do, temperature data sometimes become unstable. The data becomes unspecified.

5-1

Image 18

Hitachi EH-150 manual External Wiring

Contents

Hitachi Programmable Controller Page Limited Warranty and Imitation of Liability Page Safety Precautions Required Prohibited V i s i o n N t e n t T e Table of contents Appendix 12-1 N t r o d u c t i o n B l e 1 R e f e r e n c e M a n u a l l i s t C u m e n tE f o r e U s e N t e n t s A n t i t yR e c a u t i o n s o n U s e E a t u r e sStructure and Nameplate Structure and Name of Each PartSpecification Specification listSpecification Terminal layout and internal circuit Block Diagram Internal Block DiagramExternal Wiring External WiringTemperature rage setting SettingSetting of temperature range Setting switchO l l e c t i o n o f T e m p e r a t e D a t a I / O a l l o c a t i o nG u r e 7 Temperature Data H7FFFB3 b2 b1 b0 Example of Calculation 1 Pt100 -50 to +400 ºC range Temperature conversion data F8CC1Pt100 -20 to +40 range Error D e t e c t i o n P r o c e s s i n g E a s u r e d T e m p e r a t u r e R a n g e o v e rError Detection Processing A m p l e o f p r o g r a mO u n t i n g M e t h o d InstallationO u n t i n g A i n t e n a n c e a n d I n s p e c t i o nPrecautions on External Wiring Figure .1 Wire Separation by Conduits or DuctsX a m p l e o f P r o g r a m m i n g X a m p l e o f P r o g r a m m i n gV i c e R003 10-3 Example of Programming 2 Offset adjustment Offset error Temperature conversion dataData Error in a Specific Channel TroubleshootingAllocation Error 41 is indicated in CPU Data Error in All ChannelsCalculation of External Wiring Resistance AppendixReference