Toshiba GRL150-100 Series Instruction Manual page 140

• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
• Apply the three-phase balance current at 10% of the rated current and interrupt a phase
current.
Then, check the BCD element operates.
6.5.1.6 Cold load protection
The testing circuit is same as the circuit shown in Figure 6.5.1.
To check the cold load protection function, the scheme switch [CLPTST] in the "Switch" screen
on the "Test" menu is used. Test the item of OC1 shown in Section 6.5.1.1.
• Set the scheme switch [CLPTST] to "S0".
Check that the OC1 operates at the setting value of normal setting group.
• Next, set the scheme switch [CLPTST] to "S3".
Check that the OC1 operates at the setting value of cold load setting group [CLSG].
6.5.1.8 Current Change Detection Element OCD
The test circuit is shown in Figure 6.5.1.6.
Single-phase
current
source
+
DC
power
−
supply
DC
voltmeter
Figure 6.5.1.6 Testing Current Change Detection Element
The output signal number of the OCD is as follows:
Measuring element
OCD-A
Operation must be verified by abruptly changing the test current from 0 A to 1.2 × Setting value or
vice versa.
OCD has a fixed setting of 0.4 A and 0.08 A for 5 A rating and 1 A rating respectively.
Element Signal No.
BCD 142
A
Signal number
68
⎯ ⎯
139
6 F 2 S 0 8 2 8
GRL150
TB1
-1
-2
A
Monitoring
jack
TB2
-A9
0V
-B9
E