1
SUBJECT
1. Introduction .................................................................................................................................2
2. Description ..................................................................................................................................2
3. Operation ....................................................................................................................................2
4. Trip Relay and Auxiliary Fault Relays .......................................................................................6
5. LED Indicators and Diagnostics ................................................................................................6
6. Settings .......................................................................................................................................8
7. Use with Sigma3-TDM Touchscreen Display Module ...........................................................14
8. MODBUS Communication ........................................................................................................18
9. Installation .................................................................................................................................22
10. Commissioning ..........................................................................................................................25
11. Technical Specifications ............................................................................................................32
12. Catalogue Numbers ...................................................................................................................33
Appendix A: Excerpt from CAN / CSA M421-00: Use of Electricity in Mines .............................33
TABLES
Table 6.1: Trip Relay Operating Mode Setting Dip switch #1 (left hand array)
Table 6.2 Trip Memory Selection Dip switch #2 (left hand array)
Table 6.3 Ground Fault Trip Time Delay Settings Dip switches #3 - #4 - #5 - #6 - #7 (left hand
array)
Table 6.4 Ground Fault Trip Current Level Settings Dip switches #8 - #9 - #10 (left hand array)
Table 6.5 System Frequency Selection Dip Switch #11 (right hand array)
Table 6.6 NGR Let-through Current Settings Dip Switches #12 - #13 - #14 - #15 - #16 (Right
Hand Array )
Table 8.1: MODBUS ID Address Map
Table 8.2: MODBUS RTU Standard 8 Byte Holding Register Read Function (03)
Table 8.3: Returned Information Structure for Holding Register Request
Table 8.4: Sigma Relay Register Definitions
Table 8.5: Relay Status Registers
Table 8.6: MODBUS Register Format Conventions
Table 10.1 NGR Test Values
FIGURES
Figure 3.1: Sigma 3 Typical System Diagram (HRG System)
Figure 3.2: Sigma 3 Typical System Diagram (LRG System)
Figure 3.3: The Creation of a Pulse Signature by Cycling the Let-Through Current Under Various
Arrangements
Figure 6.1: Sigma 3 Dip Switch Array
Figure 7.1: Sigma 3 to Sigma3-TDM Connection Diagram
Figure 7.2: Home Screen
Figure 7.3: Status Screen
Figure 7.4: Event Log
Figure 7.5: Settings Page
Figure 7.6: Sigma and Alarm Settings Page
Figure 7.7: Pulse Contactor Settings Page
Figure 7.8: Communications Settings Page
Figure 8.1(a): Preferred 4-wire MODBUS Communication Connection
Figure 8.1(b): Alternate 2-wire MODBUS Communication Connection
Figure 9.1: Sigma 3 Terminal Connections
Figure 10.1: Potentiometer to be used to Adjust HF1 Current
Figure 10.2(a): Setup for Offline Calibration Showing the Ammeter Connected
Figure 10.2(b): Example of DC Ammeter used in Calibration Procedure
Figure 10.3: Partial Short NGR when Performing Offline Calibration
Figure 10.4: Sigma3-TDM to Sigma3 Connection
Figure 10.5: Sigma3 Settings Page
Figure 10.6: Sigma3 Calibration Page
Figure 11.1: Dimensional Drawings
TABLE OF CONTENTS
