Scully ST-47 Series Technical Manual

Technical Manual ST-47 Series Self-Proving Vehicle Grounding Verifcation System Scully Signal Company / Tel. 617 692 8600 / Fax. 617 692 8620 / 800 2 SCULLY (272 8559) 70 Industrial Way, Wilmington, MA 01887-3479, USA / [email protected] / MaxSafety ® SYSTEMS ...

Table of Contents General 5. 1.1 Purpose of Equipment 1.2 ST-47 Normal Operation Technical Specifcations & Approvals 9. 2.1 Input Power 2.2 Control Contact 2.3 Operating Temperature 2.4 FM Approval & FM Approval for Canada Installation 10. 3.1 Enclosure 3.2 Physical Location 3.3 Electrical Installation 3.4 Ground Ball Installation- Stand Alone Applications 3.5 Ground Bolt Installation- Combined with Rack Monitor Initial System Checkout 11. 4.1 General 4.2 Models Without Bypass Switch 4.3 Models With Bypass Switch 4.4 Models With Deadman Feature Servicing The ST-47 12. 5.1 General 5.2 Replacing Indicator Lamps 5.3 ...

Table of Contents Diagram Appendix 6.1 DWG 61655 – Installation Drawing with Entity Parameters 17. 6.2 DWG 31412 – Outline Drawing – Control Unit Enclosure 18. 6.3 DWG 63039 – Outline Drawing – Sculcon Junction Box 19. 6.4 DWG 61441 – Wiring Diagram – Typical Loading Rack Control 20. 6.5 DWG 61345 – Principle of Overfll Prevention & Grounding 21. 6.6 DWG 61346 – Grounding Protection for Product Loading & Offoading 22. 6.7 DWG 61442 – Mounting Diagram – Control Unit & Junction Box 23. 6.8 DWG 61334 – Internal Wiring Diagram ST-47-EL 24. 6.9 DWG 61333 – Internal Wiring Diagram ST-47-ELK 25. 6.1 ...

General Page 5. 1.1 Purpose Of Equipment The ST-47 Groundhog is a line powered, Self- Proving, Vehicle Ground Verifcation System. It may be used to insure a safe ground between a terminal loading rack and a tank vehicle which is in the process of loading or unloading a hazardous product. The Groundhog system can be used in one of three modes: 1.) Wire-Through, 2.) Stand -Alone, 3.) Non Self-Proving. Optional front cover lamps indicate grounded (green lamp on) or non-grounded (red lamp on) status. Intrinsically safe ground verifcation signals connect to TB2 terminals 2 (ground) and 3 (proving signal) in ...

General Page 6. 1.1.3 Deadman Capable Model Description (Applies to Models ST-47 EL(K)/D) Deadman capable models of the ST-47 differ from standard models in two ways 1.) The Model ST-47/D requires the use of a Scully deadman equipped plug and cable or ground ball connector and cable assemblies (Model SC-47CC/D). These include a hand-operated deadman switch added to a standard plug and cable assembly. Two additional wires must be run in the intrinsically Safe (I.S.) conduit which connects the ST-47/D to the plug and cable assembly. 2.) Unlike the standard Model ST-47 there is no volt free permissive contact connected ...

General Page 7. 1.2.3 Optional Bypass Switch-Models ST-47-115 or 240 ELK An optional, three position switch, is mounted on the front cover. It allows the system to operate normally in the AUTO (center position), turned OFF (left most position), or placed in BYPASS (right most position). In the Bypass mode, the user contact will “permit” but, both the red and green lamps will be extinguished. 1.2.4 Optional Deadman Capability-Models ST-47-115 or 240 EL(K)/D 1.2.4.1 Permissive Contact Connection to External Devices Terminal 4 of TB1 is factory connected to the “hot” side of the AC power line. Th ...

General Page 8. (TB1) 3 2 1 3 2 1 TB1 GND NEUT HOT TB2 5 6 4 7 8 9 MAINS POWER FUSE Size: 3AG 250 - 5A “SLO - BLO” CONTROL CONTACTS RATED 5 AMPS 250 Volts MAX [ ] Figure 1.2 ST-47 Terminal Block Location Illustration ...

Technical Specifcations and Approvals Page 9. 2.1 Input Power 120 VAC +/- 15% or 208-240 VAC 50/60Hz .25 Amps Maximum .125 Amps Maximum 2.2 Control Contact Independently fused, 240 VAC 5 Amps resistive 2.3 Operating Temperature -40 to +158 deg. F (-40 to +70 deg. C) 2.4 FM Approval & FM Approval for Canada This system’s outputs have been FM Approved as Intrinsically Safe for Connection to Class I, Division 1, Groups C and D Hazardous Locations. The Ground Ball or Ground Bolt may be mounted in a Class I, Division 1, Group C or D Hazardous Location. The ST-47-115 EL(K) and ST-47-240 EL(K) may be mou ...

Installation Page 10. 3.1 Enclosure The ST-47 is mounted in a NEMA 7 style explosion proof & weather proof enclosure that is typically located near other rack equipment. Refer to typical loading rack installation for suggested mounting. 3.2 Physical Location a.) The front panel must be in the vertical position. b.) The hinged front cover must be able to swing open for ease of servicing and chassis removal. c.) The front panel indicators must be visible to the loader. 3.3 Electrical Installation Systems using an ST-47 controller are wired as shown on an appropriate diagram in the appendix. 3.4 Ground Ball Installation ...

Initial System Checkout Page 11. 4.1 General (Refer to Figure 1.2 for Terminal Block & Fuse Locations) Note: All Tests are done with line power applied to the ST-47. 4.2 Models Without Bypass Switch (ST-47- 115 or 240 EL) Remove all wiring from the I.S. Terminal Strip TB2. You may check operation of the Groundhog by physically shorting together terminals 1 and 2 on TB2 using a jumper wire. When this test is performed, the Permit light should illuminate and Permit contacts (TB1 terminals 3 and 4) should close. When the ST-47 is in the permissive mode any connected devices should activate. If the connecte ...

Servicing the ST-47 Page 12. 5.1 General Unless noted otherwise, all the following Procedures are done with power applied to the ST-47. AC power, as measured on the TB1 terminals 2 (neutral) and 3 hot) must be within the specifed tolerances. If it is not, correct the line voltage problems. Returning part to Scully for repair or Warranty consideration: Before returning any defective equipment to the Scully Signal Company for repair and/or Warranty consideration, call Scully at 1.800.272.8559 for an RMA (Return Material Authorization) number. 5.2 Replacing Indicator Lamps 5.2.1 Models with Bypass Switch Turn off the pow ...

Servicing the ST-47 Page 13. 5.4 Test Procedure 1 - Wire-Through Applications Only Problem: The overfll prevention plug is connected to the tanker mounted overfll prevention system and the RED non-permit lamp stays on. Unit does not “permit” externally connected devices. Procedure 1, Step A Does the tanker have a Scully Ground Bolt installed and wired to Pin 9 of the overfll prevention Socket? Procedure 1, Step B If you have a Scully Rack Tester, plug the overfll prevention cable into the socket on the tester. If you do not have a tester but do have a Scully Ground Bolt, use jumper wires to connect ...

Servicing the ST-47 Page 14. Procedure 1, Step D Using the correct socket or hex wrench (Depends on ST-47 date of manufacture) remove the cover fasteners and open the front cover. Using a fat-blade screwdriver, remove the wires on intrinsically- safe terminals TB2-2 and TB2-3. Using a Multi-Meter set on DC volts, measure the DC voltage between terminals TB2-3 (+) and TB2-2 (-). Is the voltage between 24 and 30 volts DC? 5.5 Test Procedure 2 - Stand-Alone Applications Only Problem: The Ground Ball plug is connected to the tanker mounted Scully Ground Verifcation Ball and RED non-permit lamp stays on. Unit does not “p ...

Self-Proving Vehicle Grounding Verifcation System Page 15. Procedure 2, Step A1 (Ground Bolt or Ground Ball NOT required) If you do not have a Scully Ground Bolt or Ground Ball. Using a Multi-Meter set on DC volts measure the voltage between spring plunger contact inside the plug (+) and one of the three contact fngers (-) of the Ground Ball Connector Plug. Is the voltage between 24 and 30 volts DC? Procedure 2, Step B (Ground Bolt required) Using the correct socket or hex wrench (depends on ST-47 date of manufacture) remove the cover fasteners and open the front cover. Using a fat-blade screwdriver, remove the wires on intrinsicall ...

Servicing the ST-47 Page 16. 5.6 Troubleshooting Models with Deadman Capability 5.6.1 General Before proceeding with this section the ST-47 must be operational. It must permit (green lamp) when connected to a Scully Ground Ball or Ground Bolt. The unit is capable of turning on the green permit lamp even if the deadman circuitry is not functioning properly. If the unit will not permit, consult the earlier parts of this troubleshooting section for advice on repairing the problem. 5.6.2 Wire-Through and Stand-Alone Applications Troubleshooting Problem: The ST-47 permit lamp comes on but the ST-47 will not activate an ext ...

Diagram Appendix Page 17. 6.1 DWG 61655 – Installation Drawing with Entity Parameters 61655 RevA composants peuvent nuira a la securite intrinseque et creer des conditions dangereuses. Couper l'alimentation avant d'ouvrir la protection. Garder la courvercle clos tant que les Disconnect power before opening enclosure. Keep cover tight while circuits are Improper connections, component substitution or tampering may impair intrinsic . .. alive. WARNING WARNING . safety and create hazardous conditions. S/N .. ' Model: ST-47- circuits sont en etat de marche. Power Supply VAC, 20VA max. AVERTISSEMENT Um ' Y ...

Diagram Appendix Page 18. 31412 RevC ENTRY SAFE INTRINSIC scully 5.87 8.38 6.75 2.25 (57.1) 8.44 R 13.69 10°, 4 PL G SEE NOTE 2 2.00 6.62 ENCLOSURE EARTH 2.47 TOP VIEW 5.87 SEE NOTE 2 2. ENTRY HOLES: 1. DIMENSIONS ARE IN INCHES WITH MILLIMETERS NOTES: (347.7) (214.3) BOTTOM VIEW FMC APPROVED MODELS: 3/4" NPT ATEX APPROVED MODELS: M20 X 1.5 IN PARENTHIESS. BONDING STUD (168.1) (50.8) (149.0) (62.7) (12.7) .50 FRONT VIEW (212.9) (149.0) REAR VIEW (146.0) 5.75 (171.5) (MOUNTING LUG CENTERS) (MOUNTING LUG CENTERS) 6.2 DWG 31412 – Outline Drawing – Control Unit Enclosure ...

Diagram Appendix Page 19. 6.3 DWG 63039 – Outline Drawing – Sculcon Junction Box 63039 RevF 7.33 7.87 (200.0) 5 6 3 4 2 (186.2) 3.94 (100.0) CONDUIT HUB (CABLE GLAND) Ø1.06 (27) KNOCKOUT FOR 1 3.94 (65.5) 2.58 (100.0) (81.3) 3.20 1.44 (36.6) Ø1.06 (27) HOLE FOR CONDUIT HUB (CABLE GLAND) MOUNTING CENTERS FOR #8 (4) HEX SOCKET HEAD SCREWS (4 PLACES) NOTES: 1. DIMENSIONS ARE IN INCHES WITH MILLIMETERS IN PARENTHIESS. ...

Diagram Appendix Page 20. 6.4 DWG 61441 – Wiring Diagram – Typical Loading Rack Control 61441 RevB 4 5 TERMINALS EMERGENCY SHUTDOWN SWITCH OR RELAY SCULLY CONTROL UNIT'S OUTPUT CONTACT CARD READER PERMISSIVE CONTACTS SET-STOP METER VALVE CONTROL CONTACTS LOADING VALVE PILOT CONTROL SOLENOIDS SV SV HI FLOW LO FLOW TO OTHER SET-STOP METERS ON SAME RACK TO OTHER LOADING RACK 5A HOT NEUT HI FLOW LO FLOW MAINS POWER NOTE: WIRING SHOWN IS TYPICAL AND WILL VARY AS MORE OR LESS EQUIPMENT IS EMPLOYED. PUMP CONTROL CIRCUITS NOT SHOWN. THIS DIAGRAM IS INTENDED TO BE USED ONLY TO CLARIFY USE OF CONTROL CONTACTS. A ...