© Siemens AG 2011
Monitoring and diagnostics of 24 V load feeders
In the process industry, automation components are generally powered with 24 V DC. With the SITOP PSE 200U selectivity module, any 24 V load is reliably monitored for overload and short circuit and in the event of faults it is switched off.
A selectivity module monitors up to 4 load feeders which can also be connected in sequence following defined periods in order to offload the power supply. Monitoring currents are ad- justable between 0.5 to 3 A and 3 to 10 A. The electronic sys- tem allow short current spikes such as making current swit- ching spikes, but
If one of the four outputs is switched off, a sum signaling con- tact is activated and can be evaluated by the
SITOP PSE200U selectivity module
Monitoring and diagnostics of wear in the motor and its vicinity
In the vicinity of motors, there are a number of wear fields: the power distribution, the motor feeder or converter, the motor itself, the supply lines, and the machine that the motor drives. For the user it is of great benefit if routine (visual) inspections by the servicing personnel, e.g. in order to determine the con- dition of the main contacts of contactors, can be omitted and the device can diagnose its own condition.
Condition monitoring records the wear with the aid of measu- red values which can be used to determine the condition of the affected components. Thus, depending on this condition, it is possible to determine the optimal time for maintenance.
Continuous system monitoring allows for intelligent mainte- nance with the optimized use of maintenance resources. For the motor environment, Siemens offers a series of condition
Intelligent maintenance with protection and switching devices
Siemens protection and switching devices are
•Powerful products for industrial controls with comprehen- sive basic functions and
•Information for condition monitoring.
In these devices, the data or acquisition variables needed for the basic functions are also used for condition monitoring or condition monitoring statements can be derived from this da- ta. The devices also have additional analog inputs, to which special sensors for condition monitoring analyses can be con- nected (example: SIMOCODE).
Only when a large number of measured values must be recor- ded or they reach a very high degree of complexity, special de- vices purely for the purpose of condition monitoring are nee- ded for monitoring bearings or pumps, for example.
Communication capability and integration in the Maintenance Station
In addition to the condition monitoring capability of the de- vices, they also have corresponding communication functions so that they can be optimally integrated into systems and plants. In addition, they are integrated in the Maintenance Station as follows:
•Via device ID IM0
•Via driver output for the control of the device condition sta- tus
•Via detailed diagnostics of the device condition (device- specific)
•For devices with an
