AuCom MVS, Руководство пользователя

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OPERATION
710-13019-00A MVS User Manual Page 51
9.4 Motor Protection
Motor, System and Soft Starter Protection Mechanisms
The MVS incorporates extensive protection features to ensure safe operation of the motor, system and soft starter. Most
protection features can be customised to suit the installation. Use parameter group 4 to control the situation where the
protections will activate and parameter group 16 to select the soft starter's response. The default response is to trip the
soft starter.

Protection Coordination
Check protection settings on the supply side of the starter to ensure correct discrimination with the soft starter.
When using fuse and main contactors, set the breaker current parameters to coordinate with the fuse and contactor. The
contactor must not open if the current is above its maximum value. The fuse must act first or the upstream breakers
instantaneous trip level must be less than the contactor's fault break current level.
If using breakers only, set breaker so that the maximum instantaneous trip time is < 150 ms.
Voltage must not be continuously maintained on the phase arms while the motor is off. Short circuit protective equipment
must be installed in all cases.

Motor Overload Protection
The MVS offers thermal model motor overload protection which monitors the performance of the motor and calculates
its temperature in all states. This protection is based on the motor information programmed in parameter groups 1 and
9, and the thermal model adjusts itself according to the motor's recent operating history (including temperature rise from
previous operation).
Time
1: Motor service factor
2: Locked rotor current
3: Motor failure curve
4: Motor thermal model protection curve
5: Typical motor operating current
Current
Motor Thermal Model Protection Set-up
To enable motor and starter protection using the motor thermal model, the soft starter must be programmed with
accurate information on the motor's characteristics.
1. Set parameters 1B
Locked Rotor Time
, 1C
Locked Rotor Current
and 1D
Motor Service Factor
according to the
motor datasheet.
2. Use instantaneous overcurrent protection (parameters 4E, 4F) to provide protection for locked rotor situations.
Refer to individual parameters for details.
3. Use instantaneous overcurrent protection stage 2 (parameters 4U, 4V) to trip circuit breaker or main contactor in the
event of extreme overcurrent situations.
9.5 Operating Feedback
Displays
The Controller displays a wide range of performance information about the soft starter. The top half of the screen shows
real-time information on current or motor power (as selected in parameter 8D). Use the
and buttons to select
the information shown on the bottom half of the screen.

Starter status

User programmable screen
0
401
3.
C
1
4
3
2
5