SUBJECT
PAGE
1. Introduction ...............................................................................................................................2
2. Description ................................................................................................................................3
2.1 Catalogue Numbers .................................................................................................3
2.2 Pick-up Settings ......................................................................................................3
2.3 Time-Current Characteristics .................................................................................3
2.4 Display ......................................................................................................................4
2.5 Trip Indicator ............................................................................................................5
2.6 Reset Control ...........................................................................................................5
2.7 Button Functions .....................................................................................................6
2.8 Power-On LED .........................................................................................................8
2.9 Pre Trip Alarm ..........................................................................................................8
2.10 ZSIP ........................................................................................................................8
3. Current Sensors .......................................................................................................................8
4. Operation ..................................................................................................................................9
5. Specifications .........................................................................................................................10
5.1 Scope ......................................................................................................................10
5.2 Control Power ........................................................................................................10
5.3 Temperature Range ...............................................................................................10
5.4 Dielectric Strength .................................................................................................10
5.5 Display ....................................................................................................................10
5.6 Accuracy .................................................................................................................10
5.7 Reset .......................................................................................................................11
5.8 Trip Indicator ..........................................................................................................11
5.9 Short Circuit Withstand Capacity .........................................................................11
5.10 Transient Immunity ...............................................................................................11
5.11 Relay Contacts .....................................................................................................11
5.12 Dropout to Pick-up Ratio .....................................................................................11
5.13 Frequency Range .................................................................................................11
5.14 Standards (except -AB types) .............................................................................11
6. Installation .............................................................................................................................12
6.1 Site Requirements .................................................................................................12
6.2 Mounting ................................................................................................................12
7. Maintenance ...........................................................................................................................12
7.1 General ...................................................................................................................12
7.2 Troubleshooting ....................................................................................................14
TABLE OF FIGURES
Figure 1: Block Diagram of MGFR Relays ................................................................................15
Figure 2: Time - Current Characteristics ..................................................................................16
Figure 3: Time - Current Characteristics ..................................................................................17
Figure 4: 3-level TCP and ZSIP Connection ............................................................................18
Figure 5: Connection Diagram for MGFR Relays .....................................................................19
Figure 6: Connection Diagram for MGFR-SE-ZB Relays ........................................................20
Figure 7 Outline & Mounting Dimensions for MGFR Relays ................................................21
Figure 8 Recommended Diode Protection to Reduce Switching Spikes ...............................21
TABLE OF CONTENTS
Summary of Contents for MGFR Series
Page 1: ...C 322EM Instruction Manual March 2015 GROUND FAULT RELAY GROUND FAULT RELAY MGFR ...
Page 17: ...FIGURE 1 BLOCK DIAGRAM OF MGFR RELAYS ...
Page 21: ...FIGURE 5 CONNECTION DIAGRAM FOR MGFR RELAYS ...
Page 22: ...FIGURE 6 CONNECTION DIAGRAM FOR MGFR SE ZB RELAYS ...
Page 24: ...www i gard com Phone 905 673 1553 Toll Free 1 888 737 4787 Fax 905 673 8472 sales i gard com ...
