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INF-TN1FSH-E
5.2.4. Measuring insulation resistance
CAUTION
Be sure to turn off the power before opening the cover of the flow transmitter.
The power terminals (N, L) and the output terminals (Iout, SERIAL, DO1 to DO3) are provided with an
arrester as standard. To measure the insulation resistance between the
power terminal
and the
grounding
terminal
, remove the earth plate of the power terminal block as shown by the following figure. To measure
the insulation resistance between each
output terminal
described above and the
grounding terminal
, remove
the ground wire of the measurement board terminal block and the control board terminal block.
The insulation resistance performance of the equipment is 100 M
Ω
/500 V DC.
Be sure to return the earth plates and ground wire in position after the measurement is completed.
[Measurement method]
(1) Between power terminal and grounding terminal
In the case of AC power: Between L, N (batch) and outer earth terminal
In the case of DC power: B, – (batch) and outer earth terminal
(2) Between output terminal and grounding terminal
Between Iout (+, –) (batch) and outer earth terminal
Between SERIAL (batch) and outer earth terminal
Between DO1 (+, –) (batch) and outer earth terminal
Between DO2 (+, –) (batch) and outer earth terminal
Between DO3 (+, –) (batch) and outer earth terminal
Refer to 3.3.5. for the outer earth terminal.
[Control board terminal block]
Iout
To Temp. sensor
Cable
(Black)
3
1
2
Cable
(Black)
B
Cable
(Yellow
/Green)
B
A
7
6
5
4
SERIAL
SERIAL
＋
9
8
−
RS232C
6
5
4
SHILD
TRX1
（＋）
TRX2
（−）
No.
RS485
COM
RXD
TXD
[Measurement board terminal block]
* Use LINE 1 terminals in case of single path.
1
HF
UP STR
LINE 1
LINE 2
Open colledtor
Relay contact
HF
DOWN STR
GND
2
GND
3
4
HF GND
UP STR
5
6
HF GND
DOWN STR
7
8
DO3
2
−
＋
DO1
1
＋
DO2
3
＋
4
−
5
6
−
7
[Power supply board
terminal block]
20 to 30 V AC
100 to 240 V AC
Power supply termimal (DC)
＋
1
−
2
3
Power supply termimal (AC)
L
1
N
2
3
4
4
Ground
wire
Ground
wire
Earth plate
