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11

5 Connecting to power supply

SU 600 • 4 … 20 mA signal conditioning instrument

30652-EN-150129

5  Connecting to power supply

5.1  Preparing the connection

Always keep in mind the following safety instructions:

• 

Connect only in the complete absence of line voltage

• 

If overvoltage surges are expected, overvoltage arresters should 

be installed

In hazardous areas you must take note of the respective regulations, 

conformity and type approval certificates of the sensors and power 

supply units.

The power supply can be 20 … 253 V AC, 50/60 Hz or 

20 … 253 V DC.

The voltage supply of SU 600 is connected with standard cable ac-

cording to the national installation standards.
The instrument is connected with standard two-wire cable without 

screen. If electromagnetic interference is expected which is above the 

test values of EN 61326 for industrial areas, screened cable should 

be used.

Connect the cable screen on both ends to ground potential. In the 

sensor, the screen must be connected directly to the internal ground 

terminal. The ground terminal outside on the sensor housing must be 

connected to the potential equalisation.
If potential equalisation currents are expected, the screen connection 

on the side of SU 600 must be made via a ceramic capacitor (e. g. 

1 nF, 1500 V). The low frequency potential equalisation currents are 

thus suppressed, but the protective effect against high frequency 

interference signals remains.

Take note of the corresponding installation regulations for Ex applica-

tions. In particular, make sure that no potential equalisation currents 

flow over the cable screen. In case of grounding on both sides this 

can be achieved by the use of a capacitor or a separate potential 

equalisation.

5.2  Input mode active/passive

With the function switch you can changeover between active and pas-

sive operation of the measuring data input.

• 

In active mode, SU 600 provides the power for the connected sen-

sors. Power supply and measurement data are transmitted over 

the same two-wire cable. This mode is provided for connection of 

measuring transducers without separate voltage supply (sensors 

in two-wire version).

• 

In passive mode the sensors are not powered, only the measured 

value is transmitted. This input is for connection of transmitters 

with their own separate  voltage supply (sensors in four-wire ver-

sion). The SU 600 can be also looped into the existing circuit like a 

normal ammeter.

Note safety instructions

Take note of safety 

instructions for Ex 

applications

Select power supply

Select connection cable

Cable screening and 

grounding

Select connection 

cable for Ex applica-

tions

Summary of Contents for SU 600

Page 1: ...Operating Instructions SU 600 4 20 mA signal conditioning instrument Document ID 30652...

Page 2: ...ion 7 3 3 Operation 7 3 4 Packaging transport and storage 7 4 Mounting 4 1 General instructions 9 4 2 Mounting instructions 9 5 Connecting to power supply 5 1 Preparing the connection 11 5 2 Input mod...

Page 3: ...ip note This symbol indicates helpful additional information Caution If this warning is ignored faults or malfunctions can result Warning If this warning is ignored injury to persons and or serious da...

Page 4: ...3 Warning about incorrect use Inappropriate or incorrect use of the instrument can give rise to application specific hazards e g vessel overfill or damage to system components through incorrect mount...

Page 5: ...we confirm successful testing of the product 2 7 Environmental instructions Protection of the environment is one of our most important duties That is why we have introduced an environment management...

Page 6: ...instructions manual F E D C B A987 6 5 4 3 2 1 0 1 2 1 3 7 6 5 2 4 Fig 1 SU 600 1 Status indication operating relay 1 and 2 2 Status indication fail safe relay 3 Status indication operation 4 adjustm...

Page 7: ...U 600 is carried out via the integrated keys and a 16 step function switch 3 4 Packaging transport and storage Your instrument was protected by packaging during transport Its capacity to handle normal...

Page 8: ...A signal conditioning instrument 30652 EN 150129 Avoiding mechanical shock and vibration Storage and transport temperature see chapter Supplement Technical data Ambient conditions Relative humidity 20...

Page 9: ...ounted via the screws or carrier rail it must always be inside a switching cabinet or protective case 4 2 Mounting instructions 1 Make sure that the cutout required for installation has a size of 92 x...

Page 10: ...the adapter plate 1 to the rear of SU 600 spring of the adapter plate downward and fasten the plate with screw 2 M4 x 6 2 PlaceSU 600 against the carrier rail 3 from below and push the instrument upw...

Page 11: ...side of SU 600 must be made via a ceramic capacitor e g 1 nF 1500 V The low frequency potential equalisation currents are thus suppressed but the protective effect against high frequency interference...

Page 12: ...ect power supply switched off to terminal 5 and 6 4 If necessary connect fail safe and operating relay as well as cur rent output The electrical connection is finished 5 4 Wiring plan 1 2 3 4 18 17 16...

Page 13: ...witch as well as two keys To open the cover insert a screwdriver in the two slots on the top and turn it slightly F E D C B A987 6 5 4 3 2 1 0 1 2 1 3 7 6 5 2 4 Fig 6 Display and adjustment elements 1...

Page 14: ...on The output signal jumps briefly to the set fault value Then the actual measured value is displayed and the corresponding current is transmitted to the current output The measured value indication s...

Page 15: ...ocedure two sensor current values 4 20 mA must be entered corresponding to the levels 0 and 100 When using a pressure transmitter an offset correction should be car ried out to reach maximum accuracy...

Page 16: ...o adjust the on and off switching points of relay 1 set the func tion switch to position 1 or 2 enter the switching points for ON or OFF and save your settings If necessary proceed in the same way wit...

Page 17: ...ulation mode can be used Any individual measured value can be simulated and e g the correct behaviour of the relays and the connected instruments can be checked Switching over between the functions OP...

Page 18: ...t the function switch to position 8 Select with the keys the measured value output 4 20 mA or 0 20 mA For this example choose 4 20 The displayed numbers have the following meanings 0 20 0 20 mA 4 20 4...

Page 19: ...when the relay is energized If the switch ing points are too close together 0 1 the appropriate LED flashes The relay takes on the safe condition In mode OPERATE an error message is outputted on the d...

Page 20: ...adjustment are checked for plausibility If irregularities occur or in case of incorrect parameter adjustment a fault signal is triggered In case of an instrument defect or line break shortcircuit a f...

Page 21: ...be carried out again 7 3 Instrument repair If a repair is necessary please proceed as follows On our homepage in the Internet under http www krohne mar com fileadmin media lounge PDF Download Specimen...

Page 22: ...separable WEEE directive 2002 96 EG This instrument is not subject to the WEEE directive 2002 96 EG and the respective national laws Pass the instrument directly on to a spe cialised recycling company...

Page 23: ...ensor supply through SU 600 mode passive Sensor has an own power supply Measured value transmission 4 20 mA Deviation Accuracy 20 A 0 1 of 20 mA Terminal voltage mode active 30 22 V at 4 20 mA Current...

Page 24: ...relay 1 2 2 x LED yellow Operation Adjustment elements 2 x key 1 x function selection switch Ambient conditions Ambient temperature 20 60 C 4 140 F Storage and transport temperature 40 80 C 40 176 F E...

Page 25: ...ent 30652 EN 150129 Galvanic separation between relay output and digital part Reference voltage 250 V Voltage resistance of the isolation 4 kV 9 2 Dimensions on 1 2 1 2 69 mm 2 72 2 mm 0 08 19 mm 0 75...

Page 26: ...26 9 Supplement SU 600 4 20 mA signal conditioning instrument 30652 EN 150129 9 3 Certificate 9 3 CE declarations of conformity...

Page 27: ...27 9 Supplement SU 600 4 20 mA signal conditioning instrument 30652 EN 150129 Fig 9 CE declarations of conformity...

Page 28: ...28 9 Supplement SU 600 4 20 mA signal conditioning instrument 30652 EN 150129 9 4 Trademark All the brands as well as trade and company names used are property of their lawful proprietor originator...

Page 29: ...g 9 Function switch 14 G Grounding 11 I Input active 11 Passive 11 Installation possibilities 9 Integration time 14 17 L LC display 24 Line break 20 Load 24 O Offset correction 15 Overflow protection...

Page 30: ...30 Notes SU 600 4 20 mA signal conditioning instrument 30652 EN 150129...

Page 31: ...31 Notes SU 600 4 20 mA signal conditioning instrument 30652 EN 150129...

Page 32: ...Subject to change without notice 30652 EN 150129...

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