Technical Data
GB
a-eberle
Issue 04/2006
Measuring and monitoring unit for insulation resistance MU-ISO-04 Input
1
8
3
9 Output 10 +
kΩ
0,7 1
0,3
1,5 2,5
0,2
MU-ISO-04
5 0,1
Auxiliary
11
18 19 20
12
100 0
18
19
20
Application
The DC power source (U) produces via series reactor (Dr) low-resistance phase conductor conductor,, The unit is measuring the insulation resistance back to the bleeder RISO a measuring current of not grounded medium-voltage power on ground, which is reverse proportional to the stations. A special application is the monitoring of insulation resistance RISO. insulation resistance of induction furnaces or arc furnaces. U Dr
-
Special advantages: Separate installation of indicating and recording instruments is possible, due to the galvanic isolated DC current separated from the high voltage section (measuring signal). Low-resistance DC power source, therefore parasitic external voltages are a re largely eliminated. High resistance AC bleeder due to series reactor.
Function The measuring unit consists of the following components: Series reactor Measuring transducer with galvanic isolated DC power source and a limit detector with relay contact signal.
RISO
-
-
UH
Block diagram
Technica echnicall Data D ata Series reactor EI 130a DC resistance 440 Ω, +/-10 Ω AC resistance (50Hz) 45 kΩ, +/- 5 kΩ ≤ 3000 V∼ Operating voltage Operating frequency 45…1000 Hz range A. Eberle GmbH & Co. KG
Technical Data Operating DC current Type Protection
Connection
Test voltage
MU-ISO-04 25 mA EI 130 open IP 00, impregnated with protecting varnish flat-pin plug 6.3 x 0.8 ⇔ Winding Ground: 7kV∼
Limits of error (RISON 5kΩ ) 1% v. EW ≤ 25 Ω / 10K Temperature effect Influence of 0.2% / 10% ∆UH auxiliary supply
≤
Limit detector Adjustment range Accuracy of adjustment Adjustment element SE Operating delay Switching contact Mechanical life
Measuring transducer with limit detector Input: Measured quantity Measuring range Measuring voltage Resistance (via series reactor) Operational voltage Output: Output quantity Y Measuring range
Load Response time Response
Relay function Insulation resistance ∞ ... 0 Ω ≤ 12 V= ≤ 250 Ω ≤
Auxiliary power AC
3000 V∼
DC current (galvanic isolation) 2.....20 mA= ⇒ RISO ∞ ... 0 Ω < 2 mA signals malfunction in the metering unit ≤ 20 Ω ≤ 0.1 s
Test voltages
Frequency range Power input
115 V or 230 V, ±5% 45 ... 65 Hz ≤ 4 VA
Ambience Climate class Temperature range
3z / -10 / +60 -10 ... +60°C
Security Class of protection Overvoltage category Pollution degree Degree of protection Inside Terminal compartment
⎡ ⎛ Ω ⎞⎤ = × ⎢× ⎜ + ⎜ Ω + ⎟⎟⎥ ⎠ ⎦ ⎝ ⎣
... 0 Ω ≤ 2.5% RISON potentiometer, front panel ≤ 1s 250V∼, 2A 50 x 106 operating cycles maximum detecor, zero signal current principle changeover contact ∞
II, EN 61010-1 2 2 IP43 IP00
Input
Output
Relay
Auxiliary
-
7 kV∼
2.3 kV∼
2.3 kV∼
7 kV∼
-
2.3 kV∼
2.3 kV∼
Relay
2.3 kV∼
2.3 kV∼
-
2.3 kV∼
Auxiliary
2.3 kV∼
2.3 kV∼
2.3 kV∼
-
Input Output
A. Eberle GmbH & Co. KG
2
Technical Data L1
MU-ISO-04
L2 1
2
DR
U
RE
1
Display
W
-
3
RISO
9
-
10 P10 P8 18
SE
19
XW
20
-
11
UH
∼
12
Terminal connections Input
Terminal
1
Output 20 mA
Terminal
-9
3 +10
Test socket 100 mV
Socket
Auxiliary 115 / 230 V ~
Terminal
~11
~12
Relay contact, Switch-over contact
Terminal
18
19
Flat-pin plug 6.3 x 0.8 Solid conductor 2.5²
+P8 -P10
Ø 2mm
Solid conductor 2.5² 20
Solid conductor 2.5²
Connection diagram 110 10
04 104
Input
1
8
3
9 Output 10
-
+
kΩ
0,7 1
0,3 0,2
MU-ISO-04
5 0,1
Auxiliary
11
8 6
1,5 2,5
18 19 20
12
100 0
18
7.6 ø7.6
7 4
19
20
1 . 5
0 6
35 7.5 37.5
ø5.1 5.1
Dimension diagram transducer 3
A. Eberle GmbH & Co. KG
Technical Data
MU-ISO-04
Operating instructions:
Operating test
Operation of the transducer MU-ISO-04 without series reactor (Dr) is not permissible. Always connect the high-voltage supply with terminal 1 of the series reactor. The output circuit terminal 9- / 10+ is galvanically isolated from the high voltage circuit. In the case of malfunction extra-low voltages occur. The metering unit including the installation is to be tested for function prior to the commissioning of the system. Attention: When testing an entire induction furnace system disconnet the insulation resistance metre (series reactor and transducer) fi rst. Possibly a test can cause an occurrence of DC voltage potential (e,g. partial opening of the DC link) Trouble shooting: In the case of malfunction at fi rst only the transducer is to be exchanged. If this action does not lead to the repair, the series reactor needs to be exchanged too. If the second action does not eliminate the malfunction, the system needs to be checked for the cause of the defect.
Control of the indication of insulation resistance R ISO = ∞
Disconnect the terminal lead of terminal 1 of the series reactor. Check: Indicator in position ∞ and/or output current = 2mA Limit value relay is on → contact between terminal 19 – 20 is closed Condition: Set point adjuster > 0 Ω
Control of the indication of insulation resistance R ISO = 0 Ω
connect terminal lead to terminal 1 of the series reactor Simulate a short circuit of the furnace. Check: Indicator in position 0 Ω and/or output current = 20mA Limit value relay is off → contact between 19 – 18 is closed.
Control of an insulation resistance R ISO
Possible reasons for malfunction: DC voltage potential caused by converter system. Earth shunt in the furnace circuit.
Connect the reference resistance (e.g. 0,7kΩ ) between terminal 1 of the series reactor and terminal 3 of the transducer. Check: Conformance of the indicator and/or output current with the calibration curve. Turn off the limit value relay by turning the set point adjuster to (∞...→...0Ω ).
Defective devices are solely to be repaired by A. Eberle GmbH & Co. KG
A. Eberle GmbH & Co. KG
Furnace operating system is switched off Auxiliary supply is connected.
4
Technical Data
MU-ISO-04
Note: The small tolerance of the copper resistance of the reactor causes a maximum measuring error of ±10 Ω. If necessary, a local calibration is possible.
Adjustment of the limit detector The adjustment of the switching point is carried out via the calibration table or the reference resistance. The set point adjuster is set to ∞ and returned slowly until the limit value relay is off (contact 18 –19 are closed). It´s at 0.7kΩ with the quoted reference resistance.
Adjustment of an insulation resistance RISO
Connect the reference resistance (e.g. 0.7kΩ ) between terminal 1 of the series reactor and terminal 3 of the transducer.
By means of a trimming resistance RE (accessible by the opening on the front plate of the transducer between clamp 1 and 3) the scale interval indicator is to be aligned with the measuring shunt.
Calibration curve MU-ISO-04 A20.0 m / 18.0 m · I 16.0
17.4
14.0 12.0 10.3
10.0 8.0
6.4
6.0 3.9
4.0
3.0
2.5
2.0
2.1
0.0 0
0,1
0,7
1,5
5
5
10
20
100
2.0
∞ R·iso/kΩ
A. Eberle GmbH & Co. KG
Technical Data
MU-ISO-04
Analogue indicator (96 x 96 mm) with coloured scale
Series reactor EI 130a A. Eberle GmbH & Co. KG
6
Technical Data
MU-ISO-04
Notes: .......................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... 7
A. Eberle GmbH & Co. KG
Technical Data
MU-ISO-04
A. Eberle GmbH & Co. KG Aalener Str. 30/32 D-90441 Nürnberg Tel.: +49 (0) 911 / 62 81 08-0 Fax: +49 (0)911 / 62 81 08 96 www.a-eberle.de
[email protected] A. Eberle GmbH & Co. KG
T612D201A00 8
