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DOLD Insulation monitors for non-earthed systems VARIMETER IMD

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DOLD Insulation monitors for non-earthed systems VARIMETER IMD
Unplanned standstills of machines and systems as a result of insulation errors can have serious consequences. By detecting such errors in ungrounded networks (IT networks) early on, DOLD insulation monitors prevent outages of electrical systems and thus guarantee higher operating and system security. The system operator is informed early on about pending critical operating conditions and people and machinery are protected by the insulation monitoring. The functionality of DOLD insulation monitoring devices has been intentionally designed simply. You profit twice over from this: through high user-friendliness as well as cost savings.
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Type Function System type Nominal Voltage [V] Response valule with auxiliary voltage Earth fault indicator Connection  for Indicator Housing style:  Width [mm]
LK 5896 Insulation monitor mixed systems 1000 adjusable,  1kΩ ... 2MΩ + + + Switch cabinet: 90
LK 5895 Insulation monitor mixed systems 1000 adjusable,  1kΩ ... 2MΩ + +
Switch cabinet: 90
LK 5894 Insulation monitor mixed systems 690 adjusable,  1kΩ ... 2MΩ + +
Switch cabinet: 90
UH 5892 Insulation monitor mixed systems AC: 400 DC: 600 fixed,  10kΩ ... 440kΩ + + + Switch cabinet: 45
IL 5880,
IP 5880,
SL 5880,
SP 5880
Insulation monitor AC; three-phase 500 adjustabe, 5kΩ ... 100kΩ + +
Distribution board: 35; 70
MK 5880N,
MH 5880
Insulation monitor AC; three-phase 500 adjustabe, 5kΩ ... 100kΩ + +
Switch cabinet: 22,5; 45
RP 5888 Insulation monitor AC; three-phase 500 adjustabe, 5kΩ ... 5MΩ + + + Distribution board: 70
IN 5880/710,
IN 5880/711,
IP 5880/711
Insulation monitor for rooms used for medical purposes AC; three-phase 500 adjustabe, 50kΩ ... 500kΩ + +
Distribution board: 52,5; 70
BD 5877/241 Motor control for  motor windings AC; three-phase 400 adjustabe, 200kΩ ... 2MΩ


Switch cabinet: 45
IL 5881,
SL 5881
Insulation monitor DC 280 adjustabe, 5kΩ ... 200kΩ
+
Distribution board: 35 Switch cabinet: 35
Following products are also available: AG 5870, AG 5876, AI 897, AI 898, EH 5878
Technical Information and Features

DOLD insulation monitoring VARIMETER IMD for non-earthed systems.

Insulation monitoring device (abbreviated: IMD), monitors the insulation resistance in non-earthed systems (IT systems). DIN VDE 0100-410 and DIN VDE 0100-710 standards mandate the use of an insulation monitoring device in non-earthed systems, in order to detect a first occurring fault between an active conductor and a component or against the ground. The IMD has to emit an optical and / or acoustic signal if a first fault occurs. Disturbances which are the result of insulation faults and costly operational downtimes, personal and other damage associated with them are prevented.

Timely information:
In non-earthed power supply systems (IT systems), no active conductors are connected directly to the ground. In case of an insulation fault, only a small residual current can flow for that reason, caused by the system leakage capacitance. Devices protecting from over-current do not respond in this case and the voltage supply remains maintained. The working process, such as an operation, for instance, can be completed. Permanent monitoring of the insulation resistance carried out by the IMD ensures timely receipt of information about potential hazards. Faults can be removed early enough. The insulation monitoring device is connected between the active mains conductors and the ground. When the measurement process is active, it supplies the mains with a measuring voltage. If an insulation fault occurs, the measuring circuit will close and a small current, proportional to the insulation fault will flow. This measuring current is evaluated by the electronic system of the device. If there are uncertainties in case of a certain insulation resistance (response value), a message will be send via the device.
DOLD insulation monitoring VARIMETER IMD for non-earthed systems.
Insulation monitoring devices of the VARIMETER IMD family are available for both the DC and the AC voltage as well as for combined systems, such as for instance, systems with floating voltage and frequency, high system leakage capacitance or the DC component of the current.
DOLD insulation monitoring VARIMETER IMD for non-earthed systems.
Advantages:
- Simple operation
- Tripping values can be adjusted via a potentiometer 
- For mains with up to AC 1000 V and DC 1000 V 
- Monitoring of early warning alarm threshold value. 
- For system leakage capacitance of up to 3000 μF 
- Customer-specific versions

Example of application of DOLD insulation monitoring device LK 5896.

The insulation monitoring device LK 5896 is optimally designed for monitoring of photo-voltaic systems thanks to its two measurement circuits, the main and the auxiliary measurement circuit. Whereas the DC component is monitored and checked for insulation fault by the main measurement circuit before the inverter, the auxiliary measurement circuit evaluates the insulation resistance against the ground on the AC side. And these all take place before the photo-voltaic system is switched on. In order to prevent two measurement circuits from influencing each other, the auxiliary measurement circuit will be deactivated via the control terminal when the system is switched on.
Example of application of DOLD insulation monitoring device LK 5896.