Dual Workstation Monitoring System

SM1


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Static Control > Monitoring Systems

Description

SM-1 is a grounding operator/workstation monitor with the highest flexibility and performance specifications in the industry. This compact system provides complete operator protection by monitoring both resistance and voltage using dual wire wrist strap.

It also monitors dissipative surface ground and low resistance of chassis ground on two workstations simultaneously. Alarm limits for max. resistance and voltage are easily set by the PC using serial communication port. Multiple monitors can be connected via optional RS-485 interface for continuous centralized monitoring of entire production facility
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Monitor Operation and Features:

The SM-1 grounding workstation monitor is a precision instrument designed for monitoring
of the status of grounding on two stations. Up to four functions can be measured for each station, and their status displayed using bicolor LED’s on the front panel
as shown on the diagram below:

Operator Grounding:
SM-1’s main function is to ground an operator wearing a dual-contact wrist strap.
While grounding the operator, the monitor measures resistance of the operator’s dual-contact wrist strap and voltage on the operator. If any of these parameters exceed programmed limits, appropriate LEDs will change color from green to red.
The LEDs labeled “WS” indicate wrist strap resistance. The LEDs labeled “V” indicate voltage on
the operator.
If the wrist strap is not plugged into a wrist strap remote, both LEDs “WS” and “V” will be off
indicating stand-by mode.
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Soft Ground
The SM-1 monitor measures resistance of dissipative surface. While that resistance stays below
programmed limits, the LEDs labeled “MAT” will be green.
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Hard Ground
The SM-1 monitor measures low value resistance to ground in the range of 2 to 20 Ohm, such as
resistance of a grounded microscope or a workbench metal frame. The appropriate LED labeled
“GND” will be green as long as that resistance stays below programmed limits.
Only 200 microamperes of current are used for this measurement, and as a result only 4mV of
potential is induced on the monitored instrument.
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Audible Alarm
If any of the measured parameters exceed programmed limits, an audible alarm will sound, in
addition to the appropriate LED turning red. For instant identification, if the alarm occurs on
“Station 1”, a series of single beeps will sound, and if the alarm is on “Station 2”, a series of double beeps will sound.
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Monitor Installation:

All of the connections to the monitor are made to the back panel as shown in the diagram below:
Two 6-ft stereo cables are used for connecting the wrist strap remotes to the monitor. One end
of each stereo cable plugs into the back of the remote and the other end plugs into the monitor
stereo connector labeled “OP1” for operator 1 or “OP2” for operator 2.

A 5-position Phoenix connector is used for connecting to:
• “m2” dissipative surface on station 2 (soft ground 2 or mat 2)
• “gnd” reference connection to ESD ground
• “m1” dissipative surface on station 1 (soft ground 1 or mat 1)
• “g2” low value resistance to ESD ground on station 2 (hard ground 2)
• “g1” low value resistance to ESD ground on station 1 (hard ground 1)

An 8-24V DC power supply is connected to a 2.5mm center positive connector labeled “power”.
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Optional analog 4-20 ma outputs and an extra power input are connected to an RJ45 connector
labeled “analog out”. Pin-out of this connector is as follows:
• Pin 1 and pin 4 analog 4-20 ma output representing operator 1 resistance
• Pin 2 and pin 5 analog 4-20 ma output representing tool 1 resistance
• Pin 3 “+” power input
• Pin 6 “-” power input and circuit GND
• Pin 7 analog 4-20 ma output representing operator 2 resistance
• Pin 8 analog 4-20 ma output representing tool 2 resistance

After the previous communications steps have been performed, the current monitor information
will be displayed in the “Device Information” and the “Setup Parameters” sections of the screen.

The “Device Information” section will display:
• Part Number “SM-1”
• Part Description “Dual Workstation Monitor”
• Firmware Revision will display the version number of the latest firmware
in the monitor CPU
• Date Programmed will display the date of the last configuration change

The “Setup Parameters” section is where various parameters can be configured by the user.
This section of the screen will display the current monitor configuration.

• “Device ID”: This field MUST be a number other than 000. If this field is “000”, the set up program will not allow the configuration change. This field is user-configurable for internal company usage.
• “Department”: User-configurable field; accepts any alpha-numeric values, including blank.
• “Wrist Strap HI”: Drop-down option menu allows the choice of any value from 8M to 35M in 1MOhm increments, or disabling this measurement.
• “Voltage Detection HI”: Drop-down option menu allows the choice of any value from 1V to 10V in 1V increments, or disabling this measurement.
• “Voltage Detection LO”: Drop-down option menu allows the choice of any value from -1V to -10V in 1V increments, or disabling this measurement.
• “Mat”: Drop-down option menu allows the choice of resistance values from 400K to 3.5M, or disabling this measurement.
• “GND”: Drop-down option menu allows the choice of resistance values from 2 Ohm to 20 Ohm in 1Ohm increments, or disabling this measurement.
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When a particular measurement is disabled, appropriate LED will be turned off and the inputs for
this measurement will be ignored.

After all of the desired configuration parameters are selected, press the “Program” button to download the information to the monitor.

Press the “Identify” button on the bottom of the screen to verify correct download.

Press the “Exit” button on the bottom of the screen to exit the setup program.

Need help?

Not sure exactly what you’re looking for or just want clarification? We’d be happy to chat with you and clear things up for you. Anytime!

Call anytime

+49 8131 998099

Email us

info@qc-quality-control.de

Address

QC-Quality Control GmbH
Dieselstrasse 11
D-85757 Karlsfeld
Phone: +49 8131 998099
Fax: +49 8131 998101
E-Mail: info@qc-quality-control.de
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