3UG4622-1AW30 Datasheet, PDF (27/114 Pages) List of Unclassifed Manufacturers – Monitoring and Control Devices

SIMOCODE 3UF Motor Management 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.
SIMOCODE-DP 3UF5
motor protection and control devices
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 I_e 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
Siemens LV 1 T · 2006
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