IT systems have the great advantage that, as described in DIN VDE 0100-410 and in section 411 of IEC 60364-4-41, a first fault does not lead to an automatic shutdown of the power supply and thereby to a failure of the entire system. On the contrary, IT systems can continue to be operated and controlled, and the fault can be rectified later when it is more convenient to do so without having high downtime costs. The basis for this are insulation monitoring systems. They monitor the insulation resistance and signal when the value falls below a specific limit value. With this information, the appropriate time for the insulation fault location can be determined. In the case of complex systems and power supplies that are distributed over a large area, the insulation fault location may require a high investment in terms of time and personnel.
The solution to this problem are insulation fault location systems that comply with the product standard DIN EN 61557-9 (IEC 61557-9). These search automatically for insulation faults during operation and indicate the faulty outgoing circuit.
The new Bender insulation fault locator EDS440 is adapted to the additional functionality of the new insulation monitoring device iso685. The iso685-D-P variant is equipped with the locating current injector required for the insulation fault location. The operating menu for the setting of the EDS440 has been extended and adapted. Automatic bus scan to detect the connected EDS440 and customised text input for the alarm messages allow a comfortable application by the operating personnel.
There always seems to be a space problem in control cabinets, in which insulation fault locators of the type EDS are usually installed. Here, the benefit of the EDS440 is its smaller enclosure width. The depth is also more compact.
The connection type is realised by plug-in terminals that are optionally available as screw or push-wire terminals. This way, a fast installation and also an easy exchange of devices is possible.
The measurement is based on the technology of the EDS460 and the EDS195P, but was optimised according to the following criteria
INFO BOX
Automatic insulation fault location during operation and indication of the faulty outgoing circuit offer the system operator the following advantages:
The solution to this problem are insulation fault location systems that comply with the product standard DIN EN 61557-9 (IEC 61557-9). These search automatically for insulation faults during operation and indicate the faulty outgoing circuit.
The new Bender insulation fault locator EDS440 is adapted to the additional functionality of the new insulation monitoring device iso685. The iso685-D-P variant is equipped with the locating current injector required for the insulation fault location. The operating menu for the setting of the EDS440 has been extended and adapted. Automatic bus scan to detect the connected EDS440 and customised text input for the alarm messages allow a comfortable application by the operating personnel.
There always seems to be a space problem in control cabinets, in which insulation fault locators of the type EDS are usually installed. Here, the benefit of the EDS440 is its smaller enclosure width. The depth is also more compact.
The connection type is realised by plug-in terminals that are optionally available as screw or push-wire terminals. This way, a fast installation and also an easy exchange of devices is possible.
The measurement is based on the technology of the EDS460 and the EDS195P, but was optimised according to the following criteria
- Higher accuracy
- Reduced interference effects from the system to be monitored
- Residual current measurement with adjustable response values (RCM function)
- Improved cable auto-detection for the connected measuring current transformers
- Higher sensitivity in connection with the series W ... AB measuring current transformers
- EDS440-S and EDS440-L for use in main circuits with a response value for the generated locating current of 2…10 mA
- EDS441-S and EDS441-L for use in control circuits with a response value for the generated locating current of 0.2…1 mA.
INFO BOX
Automatic insulation fault location during operation and indication of the faulty outgoing circuit offer the system operator the following advantages:
- A shutdown of the system (or system parts) is not necessary.
- No work on living parts is required for the fault location. Hazards for electrically skilled persons are thereby avoided.
- The insulation fault location is done automatically during operation.
- The fault location is indicated more localised and more precisely.
- The information on the faulty circuit is available within seconds.
- The recommendation mentioned in the basic safety standard DIN VDE 0100-410 (IEC 60364-4-41):
- "It is recommended that a first fault be eliminated with the shortest practicable delay." is fulfilled.
