USER GUIDE TB-9106
Ground Master Monitor
Installation, Operation and Maintenance
Made in the
United States of America
The Ground Master Monitor and its accessories are
available as the following item numbers:
Item
Description
770079
Ground Master Monitor
770064
Power Adapter, 100-240 VAC Input, 7.5
VDC 1.5 A Output, All Plugs
770069
Power Relay, North America
CTC065-C Ground Master Extension Cable Unit
CTE701
Workstation Monitor Checker
770055
SMP Software
Static Management Program
Figure 1. SCS 770079 Ground Master Monitor
Description
The SCS Ground Master Monitor is an equipment
ground continuous monitor for metal tools. It
continuously monitors the path-to-ground impedance
and electromagnetic integrity of eight metal ground
connections of process tools in work areas. This
includes semiconductor, disk drive, flat panel, and
electronic equipment manufacturing environments. The
monitor provides both visual and audible alarms and
includes fuse protection for each channel.
The Ground Master Monitor continuously monitors eight
metal tools for electromagnetic interference (EMI). EMI
can cause equipment lockups and malfunction. The
Ground Master Monitor will alarm if EMI is detected.
Each Ground Master Monitor is calibrated with accepted
procedures and standards traceable to the National
Institute of Standards and Technology (NIST) and
includes a certificate of calibration.
The Ground Master Monitor meets the Continuous
Monitor requirements of ANSI/ESD S20.20
in accordance with ESD TR53. It meets the
recommendations of ESD Handbook ESD TR20.20
which includes “if the products that are being produced
are of such value that knowledge of a continuous,
reliable ground is needed, and then continuous
monitoring should be considered or even required”.
The SCS 770079 Ground Master Monitor is compatible
with SCS Static Management Program (SMP). SMP
continuously monitors your ESD process control system
throughout all stages of manufacturing. SMP captures
data from SCS workstation, equipment and ESD event
continuous monitors and provides a real-time picture of
critical manufacturing processes. All activity is stored
into a database for on-going quality control purposes.
SMP allows you to pinpoint areas of concern and
prevent ESD events. Quantifiable data allows you to see
trends, become more proactive and prove the efficiency
of your ESD process control system.
SMP is sold separately. Click here to learn more.
Packaging
1
1
4
1
1
1
1
1
Ground Master Monitor
Monitor Ground Cord (Green and Yellow)
Replacement Fuses (250 VAC, 125 mA)
Ring Terminal
Screw, Pan-Head, 6-32 x 1/4"
Star Washer
Power Adapter, 12 VDC, with interchangeable plugs
(North America, UK/Asia, Europe, China)
Certificate of Calibration
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
TB-9106 Page 1 of 13 August 2021
© 2021 DESCO INDUSTRIES INC
Employee Owned
Features and Components
A
B. Test Limit Rotary Switch: Sets the test limit of the
tool monitor circuits from 1 to 20 ohms.
B
C
D
E
Setting
F
Test Limit
1
1 ohm
2
2 ohms
3
3 ohms
4
4 ohms
5
5 ohms
6
6 ohms
7
7 ohms
8
8 ohms
9
9 ohms
A
10 ohms*
B
12 ohms
C
14 ohms
D
16 ohms
E
18 ohms
F
20 ohms
*default setting
G
I J
L
H
M
C. Power LED: Illuminates yellow when the monitor is
powered.
K
N
Figure 2. Ground Master Monitor features and
components
A. Modbus 3.5 mm Stereo Jack: Outputs Modbus
communication protocol which may be used as an
alternative to the Ethernet port. Use a 3-conductor cable
with a 3.5 mm stereo plug as shown below to access
the terminals inside the jack. Note: The Ground Master
Monitor and external Modbus device must utilize the
same ground.
Plug Contact
Color Code Modbus Contact
Tip
Red
TR-
Center
White
TR+
Base
Green
Ground
D. Tool LEDs: Illuminates green when its respective
tool is within the impedance and electromagnetic
interference (EMI) voltage test limits. Blinks red when
its respective tool exceeds the EMI voltage limit.
Illuminates solid red and audible alarm sounds when its
respective tool exceeds the impedence test limit.
E. Tool Monitor Switches: Slide the switch up to
enable its respective tool monitor circuit. Slide the
switch down to disable its respective tool monitor circuit.
F. Audible Alarm Switch: Enables and disables the
monitor's audible alarm.
G. Communication LED: Blinks when the monitor is
powered and communicating to SMP Server.
H. Protective Fuses: Protects the spread of harmful
voltage to other tools via the Ground Master Monitor
should one of the tools become exposed to excessive
voltage. The appropriate fuse will disconnect the faulty
tool from the Ground Master Monitor and from the other
connected tools.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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Employee Owned
I. Optical Relay Terminals: Integrates with electronic
tools, lights, buzzers, etc. The relay opens when the
monitor enters a ground alarm condition, and it remains
closed otherwise.
Relay Parameter
Rating
Peak Blocking Voltage
400 VP
Load Current
On-Resistance (max)
140 mArms / mADC
22 ohms
J. Power Relay Terminals: For use ONLY with the
SCS 770069 Power Relay. Use the Power Relay to
control power to workbenches, hand tools, and other
electronic devices when the Ground Master Monitor
passes or fails.
6. Connect an Ethernet cable to the Ethernet jack
located on the bottom-side of the Ground Master
Monitor. Verify that the cable is properly connected
to a network.
7. Connect the power adapter to the power jack
located on the bottom-side of the Ground Master
Monitor. Route the wire from the supply to a nearby
AC outlet and plug it into the outlet. Make sure the
voltage and frequency match those listed on the
power supply. The Ground Master Monitor is now
powered.
K. Monitored Tool Terminals: Monitors metal tools
for proper conductive impedance and electromagnetic
interference (EMI) voltage. Use 18 AWG wire to connect
the metal tools to these terminals.
L. Ethernet Jack: Provides network communication
between the Ground Master Monitor and Static
Management Program (SMP).
Grounded Metal Tool
Tool Monitor Wire
(not included)
M. Power Jack: Connect the included 7.5 VDC power
adapter here.
N. Ground Terminal: Common ground point for the
monitor.
Installation
Monitor Ground
Cord
Hardware Setup
1. Remove the Ground Master Monitor from the carton,
and inspect for damage.
2. Determine the mounting location of the Ground
Master Monitor, and use its mounting tabs to secure
it. Its display should be visible to the operator(s).
3. Secure one end of the included ground cord to the
ground terminal located on the bottom-side of the
Ground Master Monitor. Attach the other end of the
cord to a ground point. The face plate screw of a
grounded AC wall outlet may provide a convenient
connection point.
Ethernet Network
Cable
Power Adapter
Figure 3. Wiring the Ground Master Monitor to two metal
tools
4. Insert stripped terminations of 18 AWG wires (not
included) into the monitored tool terminals located
on the bottom-side of the Ground Master Monitor.
Ensure that the tool monitor switches are enabled if
using these monitored tool terminals.
5. Route the tool monitor wires from the bottom-side
of the Ground Master Monitor to their respective
grounded metal tools, and secure them. Keep the
wires as short as possible. Do not loop or coil them
as it may affect the measured impedance.
Figure 4. Mounting hole locations (all dimensions are in
inches)
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
TB-9106 Page 3 of 13
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Employee Owned
SMP Network Setup
The following procedure outlines how to connect the Ground Master Monitor to SMP via a local area network
(LAN). SMP must be installed to a PC prior to using this procedure. The diagram shown below illustrates a common
SMP system setup that utilizes the server software, client software, WS Aware Monitor, EM Aware Monitor, and
Ground Master Monitor.
Customer’s Network
SMP Server
Network Switch
SMP Client
WS Aware
WS Aware
Ground Master
SMP Client
EM Aware
SMP Client
EM Aware
Figure 6. SMP system setup
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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DYNAMIC IP PROCEDURE
1. Verify that the Ethernet cable is securely connected to your network and Ground Master Monitor. The LEDs on
the Ethernet port will illuminate when a connection to the network is established.
2. Open SCS SMP Server Monitor.
3. The SMP Server icon will appear in the Windows taskbar.
4. Click the SMP Server icon located on the Windows taskbar. The SMP Server menu will appear. Click the Start
button to start SMP Server.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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5. A message will appear and display “Starting SMP Server…” Click the SMP Server icon located in the Windows
taskbar.
6. SMP Server will now indicate Active server status.
7. SMP Server will search and find the Ground Master Monitor on the network. The Device and Active counts will
increase to 1.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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8. Open SCS SMP Admin.
9. The window for SMP Server Admin will appear. “1 unassigned” is representative of the Ground Master Monitor
that was just found by SMP Server. Click the Add New Building button.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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10. Enter a building name, and then click the OK button.
11. The building name will appear on the navigation pane in SMP Server Admin.
12. Click on the building name in the navigation pane, and then click the Add New Floor button.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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13. Enter a floor name, and then click the OK button.
14. The floor name will appear on the navigation pane in SMP Server Admin.
15. Click on the floor name in the navigation pane, and then click the Add New Line button.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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16. Enter a line name, and then click the OK button.
17. The line name will appear on the navigation pane in SMP Server Admin.
18. Click on the line name in the navigation pane, and then click the Attachable Devices arrow located at the
bottom of the window.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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Employee Owned
19. The serial number for the Ground Master Monitor will appear. Click attach.
20. The Ground Master Monitor will attach to the selected line.
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East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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21. Open SCS SMP Client.
22. Verify that the Ground Master Monitor was added to the appropriate building, floor and line.
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
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© 2021 DESCO INDUSTRIES INC
Employee Owned
Operation
Use the table below to interpret the behavior of the
Ground Master Monitor's tool LED's and audible buzzer
(if enabled).
Green
LED
Red
LED
Buzzer
Status
ON
OFF
OFF
No failures
OFF
ON
ON
Impedance failure
ON
BLINK
OFF
EMI voltage failure
OFF
OFF
OFF
Monitor channel disabled
Maintenance
Cleaning
Disconnect the power adapter from the device. Clean
the Ground Master Monitor using a dry brush or vacuum
cleaner. Clean its contacts using a contact cleaner or
brush, and tighten all connections. Do not reconnect the
power adapter until cleaning is finished.
Replacing the Fuses
The monitored equipment may become prone to
excessive voltage and significant damage should it lose
its connection to ground or be bonded to an improperly
wired ground point. In order to prevent the spread
of this excessive voltage to other equipment via the
Ground Master Monitor, fuses are implemented for each
individual ground connection. In the case of excessive
voltage on the equipment, the appropriate fuse will
disconnect the equipment from the Ground Master
Monitor and from the other connected equipment.
Ground failure on that particular ground will be
immediately indicated.
Figure 7. SCS CTE701 Workstation Monitor Checker
Specifications
Power
Power Adapter
100-240 VAC
50-60 Hz
Output: 12 VDC @ 1.5 A
Output Plug Polarization: Center
Positive
Output Plug: 5.5 mm O.D. x 2.1
mm I.D. x 9.5 mm L
Metal Tool
Amount Monitored 8
Impedance Limit
10 ohms (default)
EMI Voltage Limit
223 mV average amplitude
(@ 1.5 MHz)
Test Voltage
80 mV square pulse @ open
circuit (80 Hz)
NOTE: Never use wire jumpers in place of fuses. Use
only factory-authorized fuses. Disconnect power before
replacing any fuses. The fuses are manufactured by
Littelfuse®, and its part number is 37301250410.
Test Current