Siemens EF6 Series Bedienungsanleitung PDF herunterladen (Seite 9)

Screw terminal 1

Spring-loaded terminal

3UG4 monitoring relays – single-phase current monitoring

Measuring range Hysteresis Contacts Starting- Tripping Control supply voltage Order No.

bypass time delay

22.5 mm wide, all of the devices can be digitally set and have an LCD display, a fault memory that can be switched-in,

simultaneous monitoring for overcurrent and undercurrent over the complete measuring range

3.0 mA AC/DC 0.1 mA–250 mA 1 CO 0.1–20 s 0.1–20 s 24 V AC/DC 3UG4621- AA30

up to 500 mA AC/DC 24–240 V AC/DC 3UG4621- AW30

0.05 A AC/DC 0.01 A–5 A 1 CO 0.1–20 s 0.1–20 s 24 V AC/DC 3UG4622- AA30

up to 10 A AC/DC 24–240 V AC/DC 3UG4622- AW30

Power factor and active current monitoring

Measuring range Measuring range

Power factor Active current On delay Tripping delay Rated control Order No.

for power for active hysteresis hysteresis supply voltage

factor current I

res

22.5 mm wide, all of the devices can be digitally set and have an LCD display, a fault memory that can be switched-in,

simultaneous power factor and active current monitoring over the entire measuring range

0.1–0.99 (cos ) 0.2–10.0 A 0.1 (cos ) 0.1–2.0 A 0–99 s 0.1–20.0 s 90–690 V AC

3UG4641- CS20

Monitoring Relays

Current and cos as a function of the motor load

Monitoring Plant/system states

parameter

Current • Overload monitoring

monitoring • Underload monitoring close to the rated torque

• Monitoring the functionality of electric loads

• Wire breakage monitoring

• Energy management

(phase current monitoring)

• Threshold value switch for analog signals

up to 20 mA

Power factor and • No-load monitoring

active current • Underload monitoring in the

monitoring lower power range

• Overload monitoring

• Extremely simple power factor

monitoring of

line supplies to control compensation equipment

• Energy management

• Interrupted cable between the cabinet

and the motor

Rule of thumb:

cos changes

significantly below

the rated load;

the current increases

overproportionally

above the rated load.

The I

res

active current shows a linear correlation between the motor load

and the measured value over the entire measuring range.

170

Rated load

0.2

0.4

0.6

0.8

1.2

1.4

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160

x cos

cos

Motor load

cos

8 | 9

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 31 32

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