Control; Motor Thermal Protection; Tests; Ground Fault Protection - WEG SSW7000 User Manual

About the SSW7000

3.1.9. Control

The SSW7000 control is implemented using two electronic control boards, isolated from each other through fiber
optic cables.
The C1 (CC11) control board is responsible for all the user access means: HMI, analog and digital inputs and
outputs, communication accessories, PT100 input and SoftPLC. It presents the possibility of firmware update
either via USB communication or via flash memory.
The C2 (CSM) control board is responsible for the motor control, the firing signals, the voltage and current
readings, and the synchronism. It is mounted in the medium voltage compartment and it does not allow direct
access to the user. The board firmware can be updated via USB communication.

3.1.10. Motor thermal Protection

Besides the possibility of using overload protection on the motor by means of preset thermal class, the SSW7000
has an eight channel PT100 input accessory (IOE-04 module), which allows monitoring the motor winding and
bearing temperatures.
The advantage of this module is the possibility of using the motor overload protection combined with the PT100
temperature measurements. Besides, these temperature measurements are also available on the HMI and
through network communication.
The fault and alarm levels of the motor thermal protection through the motor PT100 sensors can be totally
programmed. For further details, refer to sections 15.5 - Motor Thermal Protection and 15.6 - Motor Thermal
Class Protection, of the programming manual.

3.1.11. Tests

The SSW7000 has a test routine with the purpose of verifying the main panel connections. For more details, refer
to the section 7.1- SSW7000 Operation Verification
SSW7000 programming manual.
There is also the possibility of performing test with low voltage; however, it becomes necessary to change the
voltage reading connections, as well as the SSW7000 parameterization (P0296).

3.1.12. Ground Fault Protection

The SSW7000 has two ground fault detection methods. One by neutral to ground voltage measurement (in the
standard panel) for isolated networks, and another by ground fault current measurement (the current transformer
is optional).
NOTE!
The ground fault by voltage detected by the SSW7000 may have occurred in any point of the
power supply system from the transformer to the motor.
The ground fault protection by voltage has the advantage that the SSW7000 also detects the ground fault when
the ground fault current does not pass through the SSW7000.
SSW7000 | 3-4
in this manual and to the section 14.2 - Test Mode in the
Figure 3.4: Ground fault detection by voltage