253
6
F
2
S
0
8
3
4
changed in case of OST-ZN.)
•
Press 5 (= Logic circuit) on the "Test" screen to display the "Logic circuit" screen.
•
Enter 84 as a signal number to be observed at monitoring jack A and press the ENTER key.
•
Apply a three-phase rated voltage.
•
Choose a test current IT by referring to the table below, which shows the relation of setting
reach and test current.
Reach setting
IT
0.2 – 3.0
Ω
(1 - 15
Ω
10A
2.0A)(*)
3.1 – 10.0
Ω
(16 - 50
Ω
5A
1.0A)
10.1 – 20.0
Ω
(51 - 100
Ω
2.5A
0.5A)
20.1 – 30.0
Ω
(101 - 150
Ω
1.5A
0.3A)
30.1 – 50.0
Ω
(151 - 250
Ω
1A
0.2A)
(*) Values shown in parentheses are in the case of 1A rating.
Other values are in the case of 5A rating.
OSTXF
•
Set the voltage and current phase relation as shown below. That is, Va lags Vc by 90°, Vb =
−
Va and IT lags Va by 90°.
90
°
90
°
Vb
Va
Vc
IT
•
Adjust the magnitude of Va and Vb while retaining the conditions above and measure the
voltage Va at which the element operates.
•
The theoretical operating voltage is obtained by 2IT
×
ZOST when the setting reach is ZOST.
Check that the measured voltage is within
±
5% of the theoretical voltage value when it is
expressed with 2Va (= Va
−
Vb).
Element
ZOST
IT
2IT
×
ZOST Measured voltage (2V
a
)
OSTXF
OSTXB
•
Set the voltage and current phase relation as shown below. That is, Va lags Vc by 90°, Vb =
−
Va and IT leads Va by 90°.
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Summary of Contents for GRZ100-211B
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