Vanguard MCCB-250 User Manual
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REV 2 MCCB-250 USER’S MANUAL
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TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ....................................................................... 1
1.0
INTRODUCTION .................................................................................................................... 2
1.1
General Description and Features ................................................................................... 2
1.2
Furnished Accessories ...................................................................................................... 2
1.3
MCCB-250 Technical Specifications ................................................................................. 3
1.4
Controls and Indicators .................................................................................................... 4
2.0
FUNCTIONAL DESCRIPTION ................................................................................................. 6
2.1
MCCB-250 AC Current Source .......................................................................................... 6
2.2
MCCB-250 Current Output Control ................................................................................. 7
2.3
Timer Stop Input and Control .......................................................................................... 8
2.4
MCCB-250 Timer .............................................................................................................. 9
2.5
External Current Input ..................................................................................................... 9
2.6
LCD Contrast Control ....................................................................................................... 9
3.0
OPERATING PROCEDURES ................................................................................................. 10
3.1
Testing the Time Delay of a Protection Relay ................................................................ 10
3.2
Measuring Current Transformer Primary and Secondary Currents .............................. 12
LIST OF TABLES
Table 1. MCCB-250 Technical Specifications .................................................................................. 3
Table 2. Functional Descriptions of MCCB-250 Controls and Indicators ........................................ 5
Table 3. MCCB-250 Current Output ................................................................................................ 6
Table 4. MCCB-250 Overload Current Output ................................................................................ 6
LIST OF FIGURES
Figure 1. MCCB-250 Controls and Indicators .................................................................................. 4
Figure 2. Typical MCCB-250 Test Results Screen ............................................................................ 9
Figure 3. Typical MCCB-250 Application ....................................................................................... 10
Figure 4. Typical Current Transformer Current Ratio Test Connections ...................................... 12