4
TGH 1269E
About the IR5000
1 General
With the insulation monitoring device IR5000, BENDER offers a special
equipment for continuous monitoring of the insulation resistance of IT DC
systems to earth. The device is intended to indicate when the value falls below a
preset response value.
The IR5000 is suitable for IT DC systems involving:
•
systems with low insulation resistance and high nominal voltages
•
systems with water-cooled components
•
heating systems with ionizing air
•
smelting plants
•
extended systems
Special features of the IR5000 are:
•
voltage range of the system to be monitored:
DC 350 ... 800 V
•
3-voltmeter method for fast detection of symmetrical and asymmetrical
insulation faults
•
wide response range: 5
Ω
... 100 k
Ω
•
integrated voltage monitoring
•
two serial interfaces: RS232 and RS485
•
linear analog output 0...20 mA
•
three different alarm relays for earth fault at L+, earth fault at L- and
system faults
•
large LC display
•
control via microcontroller
•
real-time clock
•
menu-driven operating and setting
•
robust enclosure for surface mounting
If increased availability of power supply is concerned, the IT system, i.e. the
unearthed system, is the right choice. In contrast to the earthed system, the first
insulation fault does not lead to a disconnection. Combined with a well-chosen
insulation monitoring device, insulation faults and deteriorations are recognized
early, possibly when developing. Hence, increased availability of power supply
in an IT system stands and falls with the well-chosen insulation monitoring
device.
Maintaining a good insulation condition is decisive for reliable power supply.
Therefore the relevant standards demand that the first fault is to be cleared as
soon as possible.
IEC 60364-4-41, Punkt 413.1.5.4 (Note):
It is recommended that the first fault should be eliminated with the shortest
practical delay.
The A-ISOMETER
®
IR5000 complies with the requirements of IEC 61557-8.
The internal resistance has been adapted to the special applications for systems
with low insulation resistance values.
The standard deals with constructional and measuring parameters as well as the
test procedures, and the safety aspects of the insulation monitoring devices in
IT systems, including the use in IT AC systems, IT DC systems and IT DC
systems with galvanically connected DC circuits.
Underlying
standards
IT System
