Scully Groundhog ST-47C Series User manual

Scully ST-47C Groundhog
Technical Manual
ST-47C Series Self-Proving Vehicle
Earthing Verification System
Scully Signal Company / Tel. [phone] / Fax. [phone] / 800 2 SCULLY (272 8559)
70 Industrial Way, Wilmington, MA 01887-3479, USA / [e-mail] / www.scully.com
MaxSafety®
SYSTEMS

ST-47C Groundhog - Technical Manual
Table of Contents
General 4.
1.1 Description
1.2 Technical Specifications
1.3 Accessory Equipment
Installation 8.
2.1 Mechanical Installation
2.2 Electrical Installation
2.3 Initial System Checkout
Maintenance 12.
3.1 Enclosure
3.2 Corrosion Protection
3.3 Control Module (Circuit Board)
3.4 Module Replacement
3.5 Indicator Lights
3.6 Control (Bypass) Switch
3.7 Junction Box and Plug & Cable Unit
3.8 Troubleshooting
Diagram Appendix
4.1 DWG 31412 – Outline Drawing – Control Unit Enclosure 16.
4.2 DWG 63039 – Outline Drawing – Sculcon Junction Box 17.
4.3 DWG 61441 – Wiring Diagram – Typical Loading Rack Control 18.
4.4 DWG 61442 – Mounting Diagram – Control Unit & Junction Box 19.
4.5 DWG 61408 – Internal Wiring Diagram - ST-47C-EL 20.
4.6 DWG 61407 – Internal Wiring Diagram - ST-47C-ELK 21.
4.7 DWG 61404 – Installation Wiring Diagram, ST-47C w/ SC-47 Plug 22.
4.8 DWG 61200 – Installation Wiring Diagram, ST-47C w/ SC-47 Clamp 23.
4.9 DWG 61405 – Installation Wiring Diagram, ST-15C/ST-47C 24.
4.10 DWG 61406 – Installation Wiring Diagram, ST-35C/ST-47C 25.
4.11 DWG 61557 – Replacement Parts ST-47C-120 26.
4.12 DWG 61274 – Replacement Parts ST-47C-240 27.

ST-47C Groundhog - Technical Manual
General
Page 4.
The ST-47C Groundhog is an intelligent system that continuously and automatically monitors the earthing
connection during loading operations at the gantry (loading terminal). The Groundhog is designed to
immediately shut down the loading operation if the earth connection is broken.
The Groundhog control monitor is mounted at the gantry. Indicator lights on the cover of the control
monitor are visual reference that proper earthing has or has not been accomplished.
The Groundhog requires that each vehicle be equipped with a specially designed Scully electronic
Ground Ball or Ground Bolt. Before the loading operation can begin, the controller must see an intelligent
return signal from the Ground Ball or Ground Bolt, indicating that a proper earthing connection
has been made.
The Groundhog frustrates typical cheating methods and malfunctioning problems that can lead to
earthing vehicles improperly. The ST-47C Groundhog insures that unless the proper earthing connection
has been made, the loading process will not begin. It will automatically shut down the loading
operation if the ground is broken.
1.1 Description
The ST-47C Groundhog can be wired into your existing Scully Overfill Prevention system for the
ultimate safety system. One connection gives you overfill and earthing protection. This single
connection simplifies loading and eliminates the need for additional plugs and cables at the gantry.
When wired into an overfill prevention system, the ST-47C Groundhog utilizes a spare conductor in
the existing Scully overfill prevention plug and cable together with a special Scully Ground Bolt
mounted on each vehicle. The Scully Ground Bolt sensing lead is wired to the Scully overfill
prevention socket.
The ST-47C Groundhog can be used as a completely independent system. This system is ideal for
top loading or applications where a Scully Overfill Prevention System is not in use. The ST-47C
Groundhog control monitor connects to a heavy duty Scully Sculcon® Junction Box Kit with
attached cable and special quick release snap-on plug. The Scully Ground Plug connects to a
specially designed electronic Scully Ground Ball mounted on each vehicle. The controller, in
conjunction with the Ground Ball provides and verifies vehicle earthing before loading can begin.
The controller must receive an electronic return signal from the Ground Ball throughout the loading
operation.

Self-Proving Vehicle Earthing Verification System
General
Page 5.
1.1.1 Model Designations
The ST-47C Controller is available in 120VAC or 240VAC models, with or without control (Bypass)
Switch.
Model suffix (E) = Explosion-proof Enclosure, (L) = Indicator Lights, (K) = Key Lockable Bypass
Switch.
1.1.2 Explosion Proof Enclosure
Suffix "E" in the model number indicates controller is in an explosion-proof enclosure suitable for
hazardous areas. Conduit holes are provided in the enclosure for electrical access. The installer
must install Exd cable glands (or conduit and seal fittings) according to local codes.
1.1.3 Indicator Lights
Suffix "L" in the model number indicates red and green indicator lights on the controller
enclosure. These lights indicate the following conditions:
1.1.4 Bypass Control Switch
Adding the suffix "K" to the model number adds a lockable two-position control switch to the
enclosure. In the "NORMAL" position, the unit will operate normally, with verification of proper
earth (ground) connection causing the output relay to become energized (i.e. closed output
contact). In the "BYPASS" position, power to the unit is switched "OFF" and the normally open
relay contacts are bypassed to permit emergency operation of the equipment, without earthing
verification.
For normal operation, this switch should always be set in the NORMAL position. The switch is
enclosed in lockable box to allow locking with a user provided padlock.
CAUTION: When in "BYPASS" mode the earth ground verification is DISABLED and the system
does not provide earth (ground) connection verification.
ON OFF A good earth (ground) connection is verified Controller output is in permissive
state i.e. permit to load.
OFF ON A good earth (ground) connection is not verified. Controller output is in
non-permissive state i.e. no permit to load.
OFF OFF No power to the unit or Bypass Control Switch is in OFF or BYPASS position.
GREEN RED Condition
ST-47C-120 EL Controller in Explosion-proof Enclosure with Indicator Lights, 120VAC
ST-47C-120 ELK Controller in Explosion-proof Enclosure with Indicator Lights and Key-lockable
Bypass Switch, 120VAC
ST-47C-240 EL Controller in Explosion-proof Enclosure with Indicator Lights, 240VAC
ST-47C-240 ELK Controller in Explosion-proof Enclosure with Indicator Lights and Key-lockable
Bypass Switch, 240VAC
Model Description

ST-47C Groundhog - Technical Manual
General
Page 6.
Temperature Range -40°C to +60°C (-40°F to +140°F)
Power Requirements 120VAC Models: 100-130 VAC, 50/60 Hz, 20VA Max.*
240VAC Models: 200-250 VAC, 50/60 Hz, 20VA Max. *
*20VA does not include circuits controlled by the output relay contact
Vehicle Interface Scully Ground Ball (via Ground Ball connector plug),
Scully Ground Bolt (via plug for overfill prevention socket),
Clamp connection (Resistive).
Output Relay One normally open volt-free contact rated 250VAC, 5A resistive max.
The output contact closes when a proper earth connection has been
established.
Response Time 0.5 second maximum
Indicator Lights Output status indicator lights:
Red: Non-permissive
Green: Permissive
Output Control Fuse Internal 5 Ampere
Connections Provided by internal terminal strips.
Enclosure Explosion-proof weatherproof IP65
Dimensions See Appendix 4 for outline drawing
Weight 12 Kg (26 Lbs.)
Approvals Ex d [ia] IIB T5 Gb (Tamb= -40°C to +60°C)
Um= 120VAC or 240VAC
Uo= 51V Co= 19nF
Io= 17mA Lo= 40mH
Po= 0,215W Lo/Ro= 100μH/wΩ
1.2 Technical Specifications
The enclosure provides protection from hazardous area in accordance with standard IP65. The
rating of the enclosure is negated if the holes in the enclosure are unplugged/unscrewed or any
holes are drilled into the enclosure. Cover screws to be minimum grade A2-70 stainless steel.
The ST-47C control unit has been designed to be impact-resistant. Do not subject to excessive
mechanical or thermal stresses. Do not allow the unit to come in contact with aggressive
substances. The ST-47C may only be repaired by replacing the internal control module. The internal
control module is non-repairable.
WARNING: Do not open when an explosive gas atmosphere is present.

Self-Proving Vehicle Earthing Verification System
General
Page 7.
1.3 Accessory Equipment
In addition to the control unit, a plug and cable assembly is needed to provide the inter-connection
from the ST-47C Control Unit to the vehicle.
Scully highly recommends the use of our Sculcon® Junction Box with Plug and Cable
assembly. Use of Sculcon junction box simplifies system installation and provides for easy service
of the plug and cable assembly for maintenance. Wiring the plug and cable assembly directly into
the bottom of the ST-47C enclosure is not recommended and will result in greatly increased
maintenance time and difficulty when the plug and cable assembly requires maintenance.
1.3.1 Sculcon Junction Box with Plug and Cable Assembly
One of the following junction box and cable kits is needed to make connection to a vehicle when
fitted with Scully Ground Ball.
* Use of this cable requires operation of the ST47C system in its resistive verification configuration.
Such use does not use a Ground Bolt or Ground Ball and, as such, does not have the anti-cheating
advantages provided by the Ground Bolt or Ground Ball systems. Contact Scully Technical Services
for more information.
For a list of cables that integrate the ST-47C into Overfill Prevention systems, consult Scully Tech
Data Sheet 60614.
SC-47 Sculcon Junction Box Kit with 6m (20') straight cable and ground-proving plug
for connection to vehicle mounted ground-proving ball (independent system).
SC-47CC Sculcon Junction Box Kit with 10m (32') coiled cable and ground-proving plug
for connection to vehicle mounted ground-proving ball (independent system).
SC-47CC-CLMP Sculcon Junction Box Kit with 10m (32') coiled cable and isolated jaw, static
ground clamp for connection to vehicle chassis (independent system).
This Junction Box and Clamp Kit is required for connection directly to the
frame of the vehicle. *
Model Description

ST-47C Groundhog - Technical Manual
Installation
Page 8.
The ST-47C control system is typically installed in areas that are classified as hazardous locations
due to nature of the products being loaded. Installation of the control unit and accessories must
therefore be done by qualified personnel in accordance with all national and local regulations
(codes) governing the installation of electrical equipment in hazardous locations.
It is essential that the ST-47C control unit and accessories be installed and used in accordance with
the detailed specifications and instructions in this manual. Installations that violate national and
local regulations (codes) for installation of electrical equipment in hazardous locations and/or details
in this manual may lead to unsafe operation.
Intrinsically safe wiring to/from TB2 at the bottom of the control module must enter/exit the bottom
opening in the control unit enclosure labeled "Intrinsically Safe Entry". Intrinsically safe wiring must
be kept physically separated from any other wiring.
2.1 Mechanical Installation
When choosing a location on the loading rack for the control unit, the lights on the front of the
control unit should be readily visible and within easy reach of the user. The control unit should be
mounted vertically, in a location where the cover can open for servicing. (See Diagram 61442 in
Appendix 4 for installation.)
Refer to the Outline Drawing 31412 in Appendix 4 for physical dimensions, location of the
mounting bolts, electrical cable/conduit entry locations and enclosure earth bonding stud. The
enclosure earth-bonding stud is provided for proper electrical bonding (earthing) of the enclosure to
earth (ground). Use only the three conduit entry holes provided for wiring. The top two holes are for
power and control wiring. The bottom hole is for intrinsically safe sensor wiring only. Do not drill
any additional conduit holes in the enclosure; doing so violates the enclosure's hazardous location
approval and voids the warranty.
To avoid future maintenance issues regarding water infiltration into the enclosure via the electrical
cable entries, we strongly recommend the following precautions:
•Minimize long vertical cable (or conduit) runs into the top of the enclosure as long
vertical runs promote water channeling to the cable gland.
•The cable glands at the top of the enclosure should be very carefully installed,
taking extra precaution to make certain that the installation is proper and sealed
(as required by code).
•Must seal all enclosure cable gland entries to maintain IP65 rating and protect
against water infiltration. Install a fiber washer between the cable gland and the
enclosure.
2.2 Electrical Installation
Refer to the Installation Wiring Diagrams in Appendix 4.
All cable entry fittings, junction boxes, connections, wiring, etc. are to be provided by the installer.
Explosion- proof cable glands should be employed for cable entry. If conduits are used for cable
entry, seal fittings must be installed in each conduit.

Self-Proving Vehicle Earthing Verification System
Installation
Page 9.
There are three holes in the enclosure for cable entry. Two holes in the top of the enclosure are for
mains power and control output wiring. One hole in the bottom of the enclosure, labeled
"Intrinsically Safe Entry" is for connection to ground verifications, via a Scully Sculcon Junction
Box.
WARNING The electrical cable entry in the bottom of the enclosure marked "INTRINSICALLY SAFE
ENTRY" must only be used for vehicle interconnection (via plug and cable assembly). To maintain
intrinsic safety, this cable entry must not be used for any other wiring. DO NOT ROUTE MAINS
POWER THROUGH THIS HOLE.
2.2.1 Power Connections
Route the mains power wires through the top left-hand entry hole in the top of the enclosure.
Connect mains power wires to the appropriate terminals on the terminal block (strip) on the metal
bracket in the enclosure. The Power terminals are marked E, N & L, also shown in wiring diagram.
NOTE: The ST-47C Control Module is protected by a field replaceable 1A high interrupt capacity
fuse in the enclosure. The fuse (F1) is located next to the terminal strip on metal bracket.
2.2.2 Enclosure Earth (Ground) Connection
Connect a wire (1.5mm2minimum) from the enclosure-bonding stud to earthed metallic structure
of the gantry (rack).
2.2.3 Control Output (Controlled Circuit) Connections
Route the control output wiring through the top right hand entry hole in the enclosure and connect
to output contact terminals, indicated on the terminal strip on metal bracket. The output control
contact is open when no connection from the controller is made to a vehicle (idle state). The output
control contact closes when a proper static discharge path (earthing) between the gantry and the
vehicle has been established (or when optional bypass switch is in the "Bypass" position).
The contact opens if the discharge path is broken or disconnected.
NOTE: An internal field replaceable 5A high interrupt capacity fuse protects the output relay
contact. The fuse (F2) is located on metal bracket.
The output contact is rated 250VAC, 5A resistive maximum. It is used to close a valve or pump
directly or by wiring it in series with other control contacts, such as a preset meter's control
contacts. (See Diagram 61441, Typical Loading Rack Control in Appendix 4.) In addition it may
also be connected to an input of a terminal automation system (TAS) to provide status of the
controller's output to TAS.
Caution: A valve or pump should be directly controlled by ST-47C's relay output contact. It should
not go via the logic circuits of a TAS, as that can introduce unsafe failure modes into this emergency
shutdown system. TAS may also control a valve or pump based on other conditions.

ST-47C Groundhog - Technical Manual
Installation
Page 10.
2.2.4 Intrinsically Safe Connections to Sculcon Plug & Cable Unit
Signals from ST-47C to Sculcon Plug & Cable Unit are intrinsically safe. The intrinsically safe
connections must only be made via the entry hole in the bottom of the enclosure. The
connections are made to the terminal strip TB2 at the bottom end of the printed circuit
board module. The wires must be 1.5mm2(18AWG) minimum conductor size. Connect
wires to Sculcon as shown in the Wiring Diagram in Appendix 4. Use wire colors as
indicated. If other than suggested color codes are used, this information should be so noted
in the back of this manual for future reference and troubleshooting. All wiring installation
should be in accordance with local wiring codes.
2.3 Initial System Checkout
2.3.1 Test Equipment
Scully suggests the use of Scully ST-2-DSWJ Universal Loading Rack Tester to
perform system tests out as described below. The tester will expedite the initial system
checkout of the ST-47C (when integrally wired with overfill).
While not required, the tester provides all of the proper overfill prevention system
connec tions to verify the new installation without the need to secure an actual vehicle for
testing.
•ST-2-DSWJ Tester has multiple socket configurations for connection to all
Scully Sculcon Plug Models.
Note: If the ST-47 is not being used integrally with a Scully overfill prevention system, you
must provide a vehicle or simulation equipped with the ground verification device(s)
installed.
2.3.2 Operational Testing
Apply power to the ST-47C control unit (and overfill control units, if present).
If the ST-47 is not equipped with a Bypass Control Switch then the red lamp should be lit
and the Green lamp should be off.
If the unit is equipped with a Bypass Control Switch, place Bypass Control Switch in the
normal position. Verify that the Red lamp is lit and Green lamp is off.
Bypass Equipped Units only: Check status of lights with Bypass Control Switch in the
following positions:
•NORMAL: Red light should be ON. Circuit is non-permissive
• BYPASS: Both lights should be OFF. Circuit is permissive

Self-Proving Vehicle Earthing Verification System
Installation
Page 11.
On units equipped with Bypass Control Switch: Return the Bypass Switch to the NORMAL
position. The Bypass Switch should be kept under a lock (user provided) so that its setting
cannot be tampered with.
Connect the Sculcon plug to the socket on the tester. Follow instructions provided with the
tester. As the tester simulates a vehicle’s overfill system and a Ground Bolt, the Overfill
Control and ST-47C outputs will go permissive with green light ON and red light OFF.

ST-47C Groundhog - Technical Manual
Maintenance
Page 12.
CAUTION: BEFORE PERFORMING ANY MAINTENANCE ON THE CONTROL UNIT,
DISCONNECT POWER TO THE ST-47C AND WAIT FIVE MINUTES BEFORE OPENING THE
ENCLOSURE. DO NOT OPEN WHEN AN EXPLOSIVE GAS IS PRESENT.
3.1 Enclosure
Inspect the enclosure routinely for deterioration due to environmental corrosion. The control unit
should be opened once per year for internal inspection and replacement of the corrosion inhibitor
capsule. Repair or replace as necessary only hardware that appears cracked, broken, corroded or
otherwise deteriorated. Cover screws must be minimum grade A2 – 70 stainless steel.
3.2 Corrosion Protection
The control unit is shipped from the factory with a corrosion inhibitor capsule adhered to the inside
of the cover. The corrosion capsule is designed to condition the atmosphere within the enclosure to
resist corrosion. It is intended to last approximately 1 year in normal use. As previously mentioned,
the control unit should be opened once per year for internal inspection. At this time the corrosion
capsule should be replaced (see Replacement Parts Sheet in Appendix Section 4). It is also
recommended to replace the cover O-ring at the same time.
3.3 Control Module (Circuit Board)
The ST-47C control unit's internal circuitry does not require any routine periodic maintenance, but
should be inspected during routine maintenance for corrosion or other signs of damage. The
control circuitry may be repaired only by replacing the internal control module with an equivalent
module. The internal module is non-repairable.
DO NOT ATTEMPT TO SERVICE OR REPLACE COMPONENTS ON THE ST-47C MODULE.
DOING SO WILL NEGATE WARRANTIES, CERTIFICATIONS AND JEOPARDIZE INTRINSIC
SAFETY ASPECTS OF THE DEVICE.
If it is determined (after troubleshooting, see Section 3.8) that control module needs to be replaced,
remove the faulty control module and install the replacement control module per the following
steps: (See Figure 1 ST-47C Control Module Illustration on following page). Non-operational control
modules may be returned to Scully for repair. Contact Scully Technical Services for assistance in
obtaining a Return Material Authorization (RMA) before returning any material to the factory.
3.4 Module Replacement
REMOVING THE MODULE
1. Remove (disconnect) power from the ST-47C Control Unit. Make sure the work area is
gas vapour free.
2. To open the ST-47C Control Unit cover, remove the (16) hex socket head bolts by using a
6mm hex wrench.
3. Mark/label wires connected to TB1 on printed circuit board (to be able to reconnect to
the same terminal numbers on the replacement module).
4. Disconnect all wires connected to TB1.
5. Mark/label wires connected to TB2.
6. Disconnect all wires connected to TB2.
7. Remove the Control Module assembly by loosening the four-(4) mounting screws located
in the four corners of the Control Module assembly.

Self-Proving Vehicle Earthing Verification System
Maintenance
Page 13.
INSTALLING REPLACEMENT MODULE
1. Place the new Control Module onto the mounting plate and attach the (4) mounting
screws.
2. Reconnect the wires to TB2.
3. Reconnect the wires to TB1.
4. Close the cover and attach the (16) cover bolts. Ensure the bolts are evenly tightened.
5. Apply power to the Control Unit and test for proper operation.
Note: The ST-47C Replacement Control Module cannot be repaired in the field. A damaged
or faulty module must be replaced with an equivalent Scully ST-47C Control Module. The
ST-47C Replacement Control Module must only be installed in Scully's explosion-proof
enclosure. The enclosures' explosion-proof and weatherproof integrity must be maintained.
Caution: Do not expose the Control Module to aggressive substances that may attack the
exposed material.
Figure 1: ST-47C Control Module Illustration
12
TB2
3
12
TB1
345678 9
FOR #6 (3.5 mm) SCREW
(158.8 mm)
(171.5 mm)
(6.75”)
4 PLACES
(6.25”)
(3.75”)
(95.25 mm)
(108 mm)
(4.25”)
(12.7 mm)
(54.1 mm)
(2.13”)
(.50”)

ST-47C Groundhog - Technical Manual
Maintenance
Page 14.
When used properly, contact with the control module will not cause physical injury or harm
and does not pose non-electrical dangers. The unit does not produce excessive surface
temperatures, or emit infrared electromagnetic or ionizing radiation.
3.5 Indicator Lights
The control unit employs explosion-proof LED style lights. These do not require any maintenance or
changing of bulbs. In the event a light is faulty, it must only be replaced with parts numbers shown
in Replacement Parts Sheet in Appendix 4. Follow instructions provided with the replacement
indicator lights (pilot lights).
Note: Older ST-47C Controllers employed incandescent style lights. These require replacement
of bulb if it blows. Refer to Replacement Parts Sheet in Appendix 4. Switch off AC power
supply to the controller before replacing a bulb.
3.6 Control (Bypass) Switch
On those models having a lockable control (Bypass) switch the switch box may be replaced, by
removing two screws inside the switch box. The switch box is replaced as a unit.
A faulty switch may also be replaced if necessary, see Replacement Parts Sheet in Appendix 4 for
replacement part numbers.
3.7 Junction Box and Plug & Cable Unit
The Sculcon Junction Box and Cable unit requires simple routine maintenance. More attention is
needed in highly corrosive environments.
Although it is not required, we recommend that the exposed electrical contact of the plug be
coated with a corrosion inhibiting film routinely (once per month is suggested). Corrosion inhibiting
spray, ACF-50 Corrosion Block® (manufactured by Lear Chemical Research Corporation,
Mississauga ON Canada www.learchem.com). Other external metal parts of these accessories may
also be treated as necessary to prevent atmospheric corrosion problems.
The exterior surface of the plug should be kept clean using a mild detergent based cleaning
solution and water. The cabling should be routinely wiped of foreign material and cleaned to
preserve the outer jacket. To protect it from loading arm damage etc., it is important to store the
plug and cable out of harms way when it is not in use. A hook is provided on Sculcon Junction Box
or, if an overfill prevention plug is used, a Scully Storage Socket may be used.
3.8 Troubleshooting
The following troubleshooting guide should aid in an initial diagnosis of most problems encountered
with installation and operation of ST-47C.

Self-Proving Vehicle Earthing Verification System
Maintenance
Page 15.
No lights ON, on front cover •No power to control unit
•Control (Bypass) Switch in OFF position
•Bulb blown (on older units with incandescent
lamps)
•Input power fuse (F1) is blown
•Control Module is defective
• Bad wiring to lamps
Green (Permissive) light ON, •Control Output fuse (F2) is blown
but control contact outut • Wiring defect (control output contact wiring)
does not activate •Control Module is defective
valve/pump
Red (Non-permissive) •Fault in wiring to junction box and/or plug
light stays ON when •Ground Ball (or Ground Bolt) not installed
connected to vehicle properly on vehicle.
equipped with Ground Ball •Bad plug to Ground Ball or Ground Bolt socket
(or Ground Bolt) connection
•Control Module is defective
•Incorrect wiring to ST-47C TB2
Condition Possible Cause

ST-47C Groundhog - Technical Manual
Diagram Appendix
Page 16.
4.1 DWG 31412 – Outline Drawing – Control Unit Enclosure
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)

Self-Proving Vehicle Earthing Verification System
Diagram Appendix
Page 17.
4.2 DWG 63039 – Outline Drawing – Sculcon Junction Box
63039 RevF
7.33
7.87
(200.0)
5 63 42
(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.

ST-47C Groundhog - Technical Manual
Diagram Appendix
Page 18.
4.3 DWG 61441 – Wiring Diagram – Typical Loading Rack Control
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. ALL CONTACTS SHOWN IN NON-PERMISSIVE STATES.
TYPICAL LOADING RACK CONTROL SHOWING PERMISSIVE CONTACTS
IN CIRCUIT TO LOADING VALVES.
61441 RevC

Self-Proving Vehicle Earthing Verification System
Diagram Appendix
Page 19.
4.4 DWG 61442 – Mounting Diagram – Control Unit & Junction Box
61442 RevC
WIRING USING SEPARATE
INTRINSICALLY SAFE
CABLE
PLUGGED USING A CERTIFIED FLAMEPROOF STOPPER PLUG.
IN THIS CABLE OR CONDUIT.
AND THE CONTROL UNIT ENCLOSURE AT ALL CABLE PORT ENTRIES.
4. USE FIBER SEALING WASHERS BETWEEN THE CABLE GLAND FITTINGS
THE CONTROL UNIT ENCLOSURE TO AVOID CONDENSATION CHANNELING.
OR IN A CONDUIT. NO OTHER SIGNALS ARE TO BE RUN
JUNCTION BOX MUST BE RUN USING DEDICATED CABLE
OF THE CONTROL UNIT ENCLOSURE AND THE SCULCON
2. THE INTRINSICALLY SAFE WIRING BETWEEN THE BOTTOM PORT
INTENDED TO REPRESENT CODE COMPLIANCE. DETAILS SHOWN ARE FOR REFERENCE ONLY AND ARE NOT REGULATIONS FOR INSTALLATIONS IN HAZARDOUS LOCATIONS
3. MINIMIZE LONG VERTICAL RUNS OF CABLE INTO THE TOP PORTS OF
INSTALLATION NOTES
1. INSTALLATION MUST COMPLY WITH NATIONAL AND LOCAL
5. ANY UNUSED HOLES IN THE FLAMEPROOF ENCLOSURE MUST BE
OVERFILL PREVENTION SYSTEM ON PLUG ASSEMBLY TO CONNECT TO VEHICLE.
2
4
3
4. INDUSTRIAL CABLE GLAND FITTING. 2. SCULCON JUNCTION BOX WITH PLUG AND CABLE. 1. CONTROL UNIT
EQUIPMENT SCHEDULE (TYPICAL)
3. FLAMEPROOF Exd CABLE GLAND FITTING.
(PLUG HOLE IF NOT USED) ALTERNATIVE ENTRY FOR OUTPUT CONTROL WIRING
MAINS POWER AND OUTPUT CONTROL WIRING
1 3
EACH CONDUIT (NOT SHOWN). EXPLOSION-PROOF ENCLOSURE IN A HAZARDOUS LOCATION, IN
IMPORTANT: INTRINSICALLY SAFE AND NON-INTRINSICALLY SAFE
MUST BE INSTALLED WITHIN 18 INCHES OF AN
WIRING MUST ALWAYS BE SEPARATED AND RUN IN SEPARATE CONDUITS/CABLES.
IF CONDUITS ARE USED FOR CABLE ENTRY, SEAL FITTINGS

ST-47C Groundhog - Technical Manual
Diagram Appendix
Page 20.
4.5 DWG 61408 – Internal Wiring Diagram - ST-47C-EL
TB1
SPST VOLT
CONTACT
AC LINE
FREE PERMISSIVE
54
C NO
3
LIVE
2
1
NEUT
EARTH
VOLTAGE INPUT
F2
5A FAST BLOW SEE NOTE 3
F1 1A FAST BLOW SEE NOTE 3
TB1
ORN
BRN
987
WETDRY
YEL
BLK
RED
WHT
BLK
WHT
54
DRYWET
321
INPUT
AC LINE
ST-47C-120/240 H
6
GRN
EARTH
CHASSIS
R
BLK
BLK
G
WHT
FRONT COVER
COMPONENTS
GRN
ORN
BRN
WHT
BLK
GRN
(END USER WIRING TERMINAL)
TB2
321
BOLT OR GROUND BALL
CONNECTION TO GROUND
CIRCUIT MODULE
NOTES: UNLESS OTHERWISE SPECIFIED-
1. ``DRY'' CONTACTS CLOSE WHEN ST-47C IS IN PERMISSIVE MODE. 2. PERMISSIVE CONTACT RATED 250 VAC 5 AMP RESISTIVE.
3. USER REPLACEABLE FUSE.
61408 RevA