3UG3501 datasheet(27/114 Pages) ETC2

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SIMOCODE 3UF Motor Management and Control Devices

7/27

Siemens LV 1 T · 2006

SIMOCODE-DP 3UF5

motor protection and control devices

■Function

Protective and monitoring functions

For the protection of loads against impermissible high

temperature rises

Types of overload protection:

• Current-sensitive, electronic overload protection with

adjustable tripping characteristics (class times)

SIMOCODE-DP protects three-phase or AC motors from

overloading according to the requirements of IEC 60947-4-1.

The class (trip class) indicates the maximum tripping time

during which SIMOCODE-DP must trip at 7.2 times the

operational current from cold. The trip class can be set in six

stages from Class 5 to Class 30. The break time can therefore

be extremely finely adjusted to the load torque of the motor –

to optimize utilization of the motor (see also the section

Characteristic Curves).

• Phase failure/unbalance monitoring

A signal is output for a phase unbalance greater than 40 %.

The tripping times of the overload characteristic are reduced,

because the heat generated in the motor rises under

unbalanced conditions (additional eddy-current losses).

• Thermistor motor protection

Temperature-dependent motor protection is based on direct

temperature measurements in the motor. These protective

functions should be used, in particular, in motors with high

operating frequencies, heavy-duty starting, intermittent and/or

braking operation, but also in the case of a blocked air supply

or speeds lower than the rated speed. For this reason, a wide

range of different temperature sensors are available that are

installed in the stator winding or in the motor enclosure.

SIMOCODE-DP can evaluate the following sensor types:

- Binary PTC sensors whose resistance rises sharply when the

temperature limit is reached

- Analog temperature sensors, such as NTC, KTY83/84, which

have an almost linear characteristic curve and can therefore

be set to any warning or switch-off temperatures

EEx e type of protection

The SIMOCODE-DP system is in compliance with the regulations

for overload protection of explosion-protected motors of the

EEx e "Increased safety" type of protection according to

• EN 50019

• EN 60079-7, IEC 60079-7

• EN 60079-14 (potentially explosive areas)

• EN 50281 (areas with combustible dust)

• ATEX/PTB test regulations

In the case of SIMOCODE-DP units with 24 V DC control infeed,

isolation by battery or safety transformer according to

EN 61558-2-6 must be assured.

EC type test certificate: PTB01 ATEX 3219

Test report: PTB EX 01-30013

Rotor locking protection

When the motor current rises above a rotor locking threshold that

can be set, SIMOCODE-DP does not trip according to the

overload characteristic, but switches off immediately instead.

The prevention of unnecessary thermal loads prevents

premature aging of the motor. The rotor locking protection is not

active for start-up monitoring until the class time has elapsed,

e.g. for Class 10 after 10 seconds.

Ground-fault monitoring

Two qualitatively different ground-fault monitoring functions are

offered:

• "Internal" ground-fault monitoring by means of calculation

The internal ground-fault monitoring is only suitable for motors

with 3-wire connection and for networks that are grounded

directly or with a low impedance. In this case, the ground-fault

current is calculated by vector addition of the phase currents

of the SIMOCODE-DP current transformer. An additional

summation current transformer is not necessary. In fault-free

systems, the vectorial summation current of the three phases

is zero; if this is not the case, a ground-fault is signaled.

Ground-fault currents that are more than 30 % of the operating

current Ie are detected.

• "Internal" ground-fault monitoring by means of measurement

The external ground-fault detection is normally used in supply

systems that have a high impedance ground. An additional

summation current transformer (3UL2 20.-.A) is required for

this method that is also suitable for extremely low ground-fault

currents. Detected fault current, depending on the summation

current transformer: 0.3/0.5/1 A.

Current limit monitoring I>, I<

Current limit monitoring is not used for motor protection, but for

process monitoring.

It is used to detect developing irregularities in the plant early,

e.g. motor bearings becoming tight (consequence: upper limit

responds) or the belt coupling to the drive machine tears

(consequence: lower limit responds).

Comprehensive motor and plant diagnostics

SIMOCODE-DP provides a variety of measuring, operating and

diagnostics data concerning the load feeder:

• Up-to-date information during operation, e.g.:

- The currently flowing phase current in %

- The switching state of the motor (On, Off, clockwise,

counterclockwise, fast, slow) derived from the current flow

- Manual/automatic mode

-Test mode

- Cooling time activated after an overload tripping operation

• Detection of incipient faults, e.g.:

- Overload warning

- Current limit overshoot

- Phase unbalance

- Thermistor warning

• Rapid diagnostics in the event of an alarm, e.g.:

- Overload

- Thermistor motor protection

- Rotor locking

- Current limit overshoot

- Checkback error (e.g. no current following On command)

• Preventive maintenance by means of statistical data, e.g.:

- Number of starts

- Number of overload trips

- Tripping currents

- Operating hours

Integrated standard programs for motor control

In SIMOCODE-DP, a number of different opportunities for

controlling the motor has been predefined and can be called up

in the form of control functions:

•Overload relay

• Direct-on-line starter

• Reversing starter

• Wye-delta starter

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