Delfield SST2-S Manuál s instrukcemi stáhnout pdf (Strana 117)

Maintenance and Troubleshooting

September 2013

7-15

LOOP + / TEST +

TEST −

DCS SYSTEM (OR OTHER

CURRENT SOURCE)

4−20mA

CURRENT

SOURCE

−

LOOP −

LOOP + / TEST +

TEST −

NOTES:

1. MULTIMETER MEASURING 0.000 TO 1.0000 VDC

2. TYPICAL READINGS 0.004 VDC TO 0.020 VDC

3. OHM’S LAW—V = I x R, WHERE R = PRECISION 1 OHM RESISTOR, V = I x 1, SO V= I

MULTIMETER

(SEE NOTES

BELOW)

0.020

DVC6000 DIGITAL VALVE

CONTROLLER TERMINAL BOX

Figure 7-8. Check the Loop Current using the TEST Terminals

Checking the Loop Current Without

Disturbing the Loop Wiring

WARNING

Personal injury or property damage

caused by fire or explosion may occur

if this test is attempted in an area

which contains a potentially explosive

atmosphere or has been classified as

hazardous.

To check the loop current without disturbing the loop

wiring perform the following procedure.

1. With the FIELDVUE instrument connected to a

current source connect a digital multimeter reading

Volts DC ( 0 to 1 VDC or mV scale) to the TEST

terminals as shown in figure 7-8.

2. The reading at the test terminals is proportional to

the loop current [0.004 V = 0.004 A (4 MA)] mA of

loop current). Refer to Specifications, table 1-2, to

determine if the current is sufficient.

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 161 162

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