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Emerson Micro Motion MVD Direct Connect, Руководство по установке

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24

Direct Connect Meters

Installation

3.8

Wiring to the remote host

1. At the remote host, open the wiring compartment and identify the RS-485 terminals. 

Refer to the vendor documentation if required.

2. If you are connecting the RS-485 wires directly from the core processor (see Figures 

2-1 and 2-2):
a. Connect the RS-485 wires from the core processor (see 

Figure 3-10

) to the RS-485 

terminals at the remote host.

b. Do not terminate the shield, braid, or drain wire(s) at the remote host. 
c. Do not terminate the RS-485 lines using the standard 60-ohm termination resistor. 

If possible, do not terminate the RS-485 lines at all. If the RS-485 cable is 1000 feet 
(300 meters) long or longer, and termination is required, the total termination 
must be 175 ohm or above.

3. If you are connecting the RS-485 wires from the I.S. barrier (see Figures 2-3 and 2-4):

a. Connect the RS-485 wires from the barrier (see 

Figure 3-12

) to the RS-485 terminals 

at the remote host.

b. Terminate the shields at the remote host.
c. The barrier contains internal pull-up/pull-down and termination resistors. Do not 

add external resistors. 

4. Close the wiring compartment.

3.9

Wiring to the power supply

1. You may connect multiple MVD Direct Connect installations to a single power supply, 

as long as each installation receives sufficient power.

2. If you are connecting the power supply wires directly from the core processor (see 

Figures 2-1 and 2-2):
a. Do not connect any other equipment to the power supply used for 

MVD Direct Connect installations.

b. Connect the power supply wires from the core processor (see 

Figure 3-10

), 

matching positive and negative (+ and –).

If you are connecting the power supply wires from the I.S. barrier (see 

Figure 2-3

 and 

Figure 2-4

):

a. The power supply may be used to power other equipment.
b. Connect the power supply wires from the barrier (see 

Figure 3-12

), matching 

positive and negative (+ and –).

Note

This step is required for all MVD Direct Connect installations.

Note

This step is required for all MVD Direct Connect installations.

Содержание Micro Motion MVD Direct Connect

Страница 1: ...Installation Manual 20002273 Rev AA July 2014 Micro Motion MVD Direct Connect Meters ...

Страница 2: ...en returning equipment These procedures ensure legal compliance with government transportation agencies and help provide a safe working environment for Micro Motion employees Failure to follow Micro Motion procedures will result in your equipment being refused delivery Information on return procedures and forms is available on our web support system at www micromotion com or by phoning the Micro M...

Страница 3: ...he MVD Direct Connect I S barrier 12 3 2 Locating the components 13 3 3 Installing the core processor 14 3 4 Wiring the core processor to the sensor 18 3 5 4 wire cable preparation and core processor wiring 18 3 6 Installing the MVD Direct Connect I S barrier 21 3 7 Wiring at the MVD Direct Connect I S barrier 22 3 8 Wiring to the remote host 23 3 9 Wiring to the power supply 24 3 10 Grounding 24 ...

Страница 4: ...4 Direct Connect Meters ...

Страница 5: ...unication between the MVD Direct Connect meter and the remote host system 1 1 Safety For information on I S applications refer to Micro Motion ATEX UL or CSA installation instructions WARNING Improper installation in a hazardous area can cause an explosion For information about hazardous applications refer to the appropriate Micro Motion approval documentation shipped with the meter or available f...

Страница 6: ...6 Direct Connect Meters Before you begin ...

Страница 7: ...rocessor may be installed The core processor standard or enhanced can be mounted integrally with the sensor or remotely If the MVD Direct Connect I S barrier is installed a separate barrier is required for each core processor See Figure 2 1 and Figure 2 2 for illustrations of MVD Direct Connect installations without the MVD Direct Connect I S barrier See Figure 2 3 and Figure 2 4 for illustrations...

Страница 8: ...Direct Connect installations Integral core processor I S barrier User supplied power cable User supplied RS 485 cable Sensor Core processor Junction box Micro Motion 9 wire cable Remote host DC power supply Remote host User supplied power cable User supplied RS 485 cable 4 wire cable Core processor Sensor DC power supply Safe area Hazardous area Barrier ...

Страница 9: ...re 2 4 MVD Direct Connect installations Remote core processor I S barrier 4 wire cable User supplied power cable User supplied RS 485 cable Sensor Micro Motion 9 wire cable DC power supply Remote host Safe area Hazardous area Barrier Core processor Junction box ...

Страница 10: ...p to fifteen MVD Direct Connect installations can be networked to a single remote host If I S barriers are used one barrier is required for each core processor Figure 2 5 shows the four options for a multidrop installation Figure 2 5 Multidrop installation options Safe area Hazardous area ...

Страница 11: ...pply may be used to power any number of core processors but must not be used to power other devices Use shielded wiring The power supply must not allow power surges or conducted radio frequency interference RFI to propagate through to its output The power supply must not be grounded In EU countries the power supply must meet the requirements of the EMC directive The power supply cable must comply ...

Страница 12: ...wer source must provide a minimum of 0 2 A of short term current per core processor The maximum steady state current is 0 15 A For assistance in sizing the power supply cable refer to Table 3 1 and use the equation below Example The core processor is mounted 350 feet from a DC power supply If you want to use 18 AWG cable calculate the required voltage at the DC power supply as follows Table 3 1 Ty...

Страница 13: ...sts the wire size and length requirements for MVD Direct Connect installations with the I S barrier Example A single MVD Direct Connect I S barrier is mounted 350 feet from a DC power supply If you want to use 18 AWG cable calculate the required voltage at the DC power supply as follows Table 3 2 Wire sizes and lengths MVD Direct Connect installations without I S barrier Span Cable type Wire size ...

Страница 14: ... 500 feet 150 meters 18 AWG 0 8 mm2 500 feet 150 meters Barrier to host RS 485 22 18 AWG 0 35 0 8 mm2 1000 ft 300 meters Barrier to power supply Power 22 AWG 0 35 mm2 300 feet 90 meters 20 AWG 0 5 mm2 500 feet 150 meters 18 AWG 0 8 mm2 500 feet 150 meters Notes Core processor to barrier wire must be sized to provide a minimum of 15 V at the core processor See the discussion in the preceding sectio...

Страница 15: ...is oriented as desired c Tighten the cap screws torquing to 30 to 38 in lbs 3 to 4 N m 3 Attach the mounting bracket to an instrument pole or wall For pipe mount two user supplied U bolts are required Contact Micro Motion to obtain a pipe mount installation kit if required Figure 3 2 Remote core processor components End cap to 9 wire ground screw Mounting bracket Core processor cover Core processo...

Страница 16: ...ocessor 1 2 14 NPT or M20 X 1 5 2 13 16 71 2 1 4 57 4 1 2 114 3 5 16 84 1 11 16 43 To centerline of 2 pipe 5 1 2 140 Pipe mount 2 1 2 64 2X 3 76 2 5 8 67 4X Ø3 8 10 4 9 16 116 Wall mount 2 13 16 71 5 11 16 144 3 4 14 NPT 2 3 8 61 Ø4 3 8 111 Dimensions in inches mm 6 3 16 158 ...

Страница 17: ...processor 1 2 14 NPT or M20 X 1 5 2 13 16 71 3 13 16 97 4 1 2 114 2 5 16 58 4 9 16 116 To centerline of 2 pipe 5 1 2 140 Pipe mount 2 1 2 64 2X 3 76 5 7 16 67 4X Ø3 8 10 4 9 16 116 Wall mount 2 13 16 71 5 11 16 144 3 4 14 NPT 3 7 8 99 Ø4 3 8 111 Dimensions in inches mm 6 3 16 158 ...

Страница 18: ... gland terminate the shield or braid and drain wires in the cable gland Never connect the drain wires to the internal ground screw of the core processor Go to Step 7 If you are installing shielded or armored cable with a Micro Motion supplied cable gland With shielded cable where the shield consists of foil prepare the cable and apply shielded heat shrink as described in Steps 3 through 6 The shie...

Страница 19: ...lated wires leaving 3 4 inch 19 mm of foil or braid and drain wires exposed and separate the wires d Wrap the shield drain wire s around the exposed foil twice Cut off the excess wire Figure 3 6 Wrapping the shield drain wires e Place the shielded heat shrink over the exposed shield drain wire s The tubing should completely cover the drain wires f Without burning the cable apply heat 250 F or 120 ...

Страница 20: ...O ring Figure 3 8 Folding the cloth shield i Install the gland body into the core processor housing conduit opening Figure 3 9 Gland body and core processor housing 6 Insert the wires through the gland body and assemble the gland by tightening the gland nut 7 Connect signal wires to the RS 485 terminals on the core processor see Figure 3 10 If you are using Micro Motion 4 wire cable use the green ...

Страница 21: ...rally with the sensor twisting the core processor will damage the sensor To avoid damaging the sensor do not twist the core processor CAUTION Damaging the RS 485 wires can cause measurement error or meter failure Damaging the power supply wires can cause meter failure When replacing the core processor cover make sure that the wires are not caught or pinched RS 485 B Green 4 wire ground screw do no...

Страница 22: ...ensions are shown in Figure 3 11 To remove the barrier from the rail lift the bottom lock Figure 3 11 Barrier dimensions Note This step is required only for installations that include the MVD Direct Connect I S barrier Refer to Figure 2 3 and Figure 2 4 1 39 35 for mounting on 35 mm DIN rail 4 095 104 0 925 23 5 Dimensions in inches mm 4 291 109 ...

Страница 23: ...e 3 12 These wires will be used in the next step to connect the barrier to the remote host Do not terminate the shields at the barrier 3 Connect power supply wires to the non I S VDC terminals at the barrier terminals 11 and 12 See Figure 3 12 These wires will be used in the next step to connect the barrier to the power supply Figure 3 12 Barrier terminals Note This step applies only to installati...

Страница 24: ...to the RS 485 terminals at the remote host b Terminate the shields at the remote host c The barrier contains internal pull up pull down and termination resistors Do not add external resistors 4 Close the wiring compartment 3 9 Wiring to the power supply 1 You may connect multiple MVD Direct Connect installations to a single power supply as long as each installation receives sufficient power 2 If y...

Страница 25: ... wire 14 AWG 2 0 mm2 or larger for grounding Keep all ground leads as short as possible less than 1 ohm impedance Connect ground leads directly to earth or follow plant standards If your installation includes the MVD Direct Connect I S barrier see Figure 2 3 and Figure 2 4 the barrier is not grounded Do not ground the barrier Figure 3 13 Core processor 9 wire ground screw Note This step is require...

Страница 26: ...26 Direct Connect Meters Installation ...

Страница 27: ...milliseconds If required a delay may be programmed into the core processor see the manual entitled Modbus Mapping Assignments for Micro Motion Transmitters The core processor may be queried as often as once every 10 milliseconds If you are sending queries at this rate at 38 400 baud a maximum of three floating point values can be returned per query Core processors may be multidropped with a maximu...

Страница 28: ...d associated byte orders are listed in Table 4 3 4 4 Additional information For more information on programming a remote host for use with MVD Direct Connect systems see the manual entitled Modbus Mapping Assignments for Micro Motion Transmitters Table 4 2 Byte contents in Modbus commands and responses Byte Bits Definitions 1 S E E E E E E E S Sign E Exponent 2 E M M M M M M M E Exponent M Mantiss...

Страница 29: ...Installation Manual 29 MVD Direct Connect communications ...

Страница 30: ... Japan T 81 3 5769 6803 F 81 3 5769 6844 Micro Motion Asia Emerson Process Management 1 Pandan Crescent Singapore 128461 Republic of Singapore T 65 6777 8211 F 65 6770 8003 Micro Motion United Kingdom Emerson Process Management Limited Horsfield Way Bredbury Industrial Estate Stockport SK6 2SU U K T 44 0870 240 1978 F 44 0800 966 181 2014 Micro Motion Inc All rights reserved The Emerson logo is a ...

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