Toshiba GRL150-100 Series Instruction Manual page 137

6.5.1.2 Overcurrent and undercurrent element OC1 to OC4, OC5, UC1, UC2 and CBF and Earth
fault element EF1 to EF4 and SEF1 to SEF4
The overcurrent element is checked on the operating current value and operating time for IDMT
curve.
Operating current check
Figure 6.5.1.4 shows a testing circuit. The operating current value is checked by increasing or
decreasing the magnitude of the current applied.
+
Single-phase
current
source
−
+
DC
power
−
supply
+
DC
voltmeter
0V
(∗): Connect the terminal number corresponding to the testing element. Refer to Table 3.2.1.
The output signal of testing element is assigned to the monitoring jack A.
The output signal numbers of the elements are as follows:
Element Signal No.
OC1-A 80
84
OC2-A
88
OC3-A
92
OC4-A
• Enter the signal number to observe the operation at the LED as shown in Section 6.5.1 and
press the ENTER key.
• Apply a test current and change the magnitude of the current applied and measure the value
at which the element operates.
Check that the measured value is within 5% of the setting value.
A
Figure 6.5.1.4 Operating Current Value Test
Element Signal No.
EF1 112
EF2 113
EF3 114
EF4 115
⎯
136
GRL150
TB1
-(*)
-(*)
Monitoring
jack
TB2
-A9
-B9
E
Element Signal No.
SEF1 116
SEF2 117
SEF3 118
SEF4 119
⎯
6 F 2 S 0 8 2 8
A
0V
Element Signal No.
UC1-A 176
UC2-A 180
CBF-A 124
OC5-A 64