Elgar GUPS 2400A-107 User manual

GLOBAL
UNINTERRUPTIBLE
POWER SUPPLY
Model GUPS 2400A–107
Operation Manual
ELGAR ELECTRONICS CORPORATION
9250 Brown Deer Road
San Diego, CA 92121-2294
1-800-73ELGAR (1-800-733-5427)
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.elgar.com
©2004 by Elgar Electronics Corporation
This document contains information proprietary to Elgar Electronics Corporation. The information contained herein is
not to be duplicated or transferred in any manner without prior written permission from Elgar Electronics Corporation.
Januar
y
23, 2004 Document No. M152491-01 Rev G

.

ELGAR ONE–YEAR WARRANTY
Elgar Electronics Corporation (hereinafter referred to as Elgar) warrants its products to be free from defects in
material and workmanship. This warranty is effective for one year from the date of shipment of the product to
the original purchaser. Liability of Elgar under this warranty shall exist provided that:
• the Buyer exposes the product to normal use and service and provides normal maintenance on the
product;
• Elgar is promptly notified of defects by the Buyer and that notification occurs within the warranty period;
• the Buyer receives a Return Material Authorization (RMA) number from Elgar’s Repair Department prior to
the return of the product to Elgar for repair, phone 800-73-ELGAR (800-733-5427), ext. 2295;
• the Buyer returns the defective product in the original, or equivalent, shipping container;
• if, upon examination of such product by Elgar it is disclosed that, in fact, a defect in materials and/or
workmanship does exist, that the defect in the product was not caused by improper conditions, misuse,
or negligence; and,
• that Elgar QA seal and nameplates have not been altered or removed and the equipment has not been
repaired or modified by anyone other than Elgar authorized personnel.
This warranty is exclusive and in lieu of all other warranties, expressed or implied, including, but not limited
to, implied warranties of merchantability and fitness of the product to a particular purpose. Elgar, its agents,
or representatives shall in no circumstance be liable for any direct, indirect, special, penal, or consequential
loss or damage of any nature resulting from the malfunction of the product. Remedies under this warranty
are expressly limited to repair or replacement of the product.
CONDITIONS OF WARRANTY
• To return a defective product, contact an Elgar representative or the Elgar factory for an RMA number.
Unauthorized returns will not be accepted and will be returned at the shipper’s expense.
• For Elgar products found to be defective within thirty days of receipt by the original purchaser, Elgar will
absorb all ground freight charges for the repair. Products found defective within the warranty period, but
beyond the initial thirty-day period, should be returned prepaid to Elgar for repair. Elgar will repair the unit
and return it by ground freight pre-paid.
• Normal warranty service is performed at Elgar during the weekday hours of 7:30 am to 4:30 pm Pacific
time. Warranty repair work requested to be accomplished outside of normal working hours will be subject to
Elgar non-warranty service rates.
• Warranty field service is available on an emergency basis. Travel expenses (travel time, per diem expense,
and related air fare) are the responsibility of the Buyer. A Buyer purchase order is required by Elgar prior to
scheduling.
• A returned product found, upon inspection by Elgar, to be in specification is subject to an inspection fee and
applicable freight charges.
• Equipment purchased in the United States carries only a United States warranty for which repair must be
accomplished at the Elgar factory.
Committed to Quality...Striving for Excellence
iii

SAFETY NOTICE
Before applying power to the system, verify that the GUPS 2400A–107 is configured properly for the user’s
particular application.
WARNING
Hazardous voltages in excess of 232 VRMS, 328V peak may be present
when covers are removed. Qualified personnel must use extreme caution
when servicing this equipment. Circuit boards, test points, and output
voltages also may be floating above (below) chassis ground.
Installation and servicing must be performed by qualified personnel who are aware of dealing properly with
attendant hazards. This includes such simple tasks as fuse verification.
Ensure that the AC power line ground is connected properly to the GUPS 2400A–107 input connector
or chassis. Similarly, other power ground lines including those to application and maintenance equipment
must be grounded properly for both personnel and equipment safety.
Always ensure that facility AC input power is de-energized prior to connecting or disconnecting the power
cables. Similarly, the GUPS 2400A–107 circuit breaker must be switched off prior to connecting or
disconnecting output power.
In normal operation, the operator does not have access to hazardous voltages within the chassis. However,
depending on the user’s application configuration, HIGH VOLTAGES HAZARDOUS TO HUMAN SAFETY
may be generated normally on the output terminals. The customer/user must ensure that the output power
lines are labeled properly as to the safety hazards and that any inadvertent contact with hazardous voltages
is eliminated.
Guard against risks of electrical shock during open cover checks by not touching any portion of the electrical
circuits. Even when power is off, capacitors may retain an electrical charge. Use safety glasses during open
cover checks to avoid personal injury by any sudden component failure.
Always disconnect the AC input power and allow three minutes, minimum, before performing any internal
servicing.
Neither Elgar Electronics Corporation, San Diego, California, USA, nor any of the subsidiary sales
organizations can accept any responsibility for personnel, material or consequential injury, loss or damage
that results from improper use of the equipment and accessories.
SAFETY SYMBOLS
CAUTION
Risk of Electrical Shock
CAUTION
Refer to Accompanying Documents
Off (Supply)
Standby (Supply)
On (Supply)
Direct Current (DC)
Alternating
Three–Phase
Fuse
Earth (Ground) Terminal
Protective Conductor Terminal
Current (AC)
Alternatin
g
Current
iv

CONTENTS
SECTION 1 GENERAL DESCRIPTION ...............................................1-1
1.1 Introduction......................................................................................................1-1
1.2 General Description.........................................................................................1-1
1.3 Specifications...................................................................................................1-1
SECTION 2 INSTALLATION ..............................................................2-1
2.1 Introduction......................................................................................................2-1
2.2 Unpacking and Inspection ...............................................................................2-1
2.3 Installation........................................................................................................2-2
2.4 Air Intake and Exhaust.....................................................................................2-2
2.5 Input/Output Connectors .................................................................................2-2
2.6 Wire Gauge Selection......................................................................................2-6
SECTION 3 OPERATION....................................................................3-1
3.1 Introduction......................................................................................................3-1
3.2 Control and Indicator Panel.............................................................................3-1
3.2.1 Indicators.............................................................................................3-1
3.2.2 Pushbutton Switches...........................................................................3-3
3.3 Circuit Breaker.................................................................................................3-3
3.4 Audible Alarm ..................................................................................................3-3
3.5 Control Signals ................................................................................................3-3
3.6 Connectors ......................................................................................................3-4
3.7 Start-Up and Shutdown Sequences ................................................................3-5
3.8 Battery Operation.............................................................................................3-5
3.8.1 Battery Care and Handling ..................................................................3-6
GUPS 2400A–107 Operation Manual v

Contents
3.9 RS-232 Data Communications Port.................................................................3-7
3.9.1 Hardware Interface...............................................................................3-7
3.9.2 Software Interface................................................................................3-7
3.9.3 RS-232 Protocol...................................................................................3-8
3.9.4 Test Data Request Commands............................................................3-8
3.9.5 Elgar Terminal Interface (ETI) Data Request Commands....................3-10
3.9.6 Status Words......................................................................................3-11
3.9.7 AC Line Loss Signal...........................................................................3-16
SECTION 4 MAINTENANCE.............................................................. 4-1
4.1 Introduction ......................................................................................................4-1
4.2 Service Information..........................................................................................4-1
4.3 Spare and Repair Parts....................................................................................4-1
4.4 Periodic Maintenance.......................................................................................4-1
4.5 Troubleshooting ...............................................................................................4-2
LIST OF FIGURES
Figure 2–1. GUPS 2400A-107 (Front View) ............................................................... 2-3
Figure 2–2. GUPS 2400A-107 (Rear View)................................................................ 2-4
Figure 2–3. GUPS 2400A-107 Dimensions (Top, Side, and Front Views) .................2-5
Figure 3–1. GUPS 2400A-107 Control and Indicator Panel ...................................... 3-2
LIST OF TABLES
Table 2–1. GUPS 2400A-107 Input/Output Connectors............................................. 2-2
Table 2–2. Recommended Wire Gauge Selection Guide........................................... 2-6
Table 3–1. GUPS 2400A-107 Connector Pin Assignments........................................ 3-4
Table 3–2. Battery Storage Times.............................................................................. 3-6
Table 3–3. RS-232 Connector Pin-Out....................................................................... 3-7
Table 3–4. RS-232 Communications Port Protocol.................................................... 3-8
Table 3–5. Status Word 1 Data Format.................................................................... 3-11
Table 3–6. Status Word 2 Data Format.................................................................... 3-14
Table 4–1. GUPS 2400A-107 Troubleshooting Guide................................................ 4-2
vi GUPS 2400A–107 Operation Manual

SECTION 1
1.1 Introduction
1.2
1.3 Specifications
GENERAL DESCRIPTION
The Elgar Model GUPS 2400A-107 is a 2400 VA Global Uninterruptible Power Supply (GUPS)
that provides regulated 115 VRMS, 60 Hz output power at up to 20.9 Amps RMS load current.
The GUPS 2400A-107 accepts 3-phase AC input line voltages from 159V to 232V at
frequencies from 370 Hz to 430 Hz. A battery backup of five minutes at 2400 VA output is
provided by a removable battery pack. Output power is continuous when transferring from AC to
battery or battery to AC.
General Description
The GUPS 2400A-107 is contained in a rack-mount enclosure. All input and output connections
are made at the rear panel. Cooling air is drawn in through a filter on the front panel and
exhausted out the rear panel. Operational and input/output power status is indicated by front
panel LEDs. An AC input circuit breaker and control pushbutton switches also are located on
the front panel. There are no operator adjustments.
(Specifications Subject to Change Without Notice)
AC Input Voltage: 115/200V, 3-phase, 3-wire plus ground, neutral not used;
159V to 232V, line voltage;
92V to 134V, phase voltage
AC Input Current: 9.8A, maximum at 200V, 2400VA/1920W load, fully charged battery;
12.5A, maximum at 159V, 2400VA/1920W load, charging battery
AC Input Frequency: 370Hz to 430Hz
Batteries: 192VDC, sealed, maintenance-free, lead-acid
Battery Hold-Up Time: 5 minutes with a 2400VA/1920W load at 25°C
GUPS 2400A–107 Operation Manual 1-1

General Description
1-2 GUPS 2400A–107 Operation Manual
Battery Recharge Time: 4 hours to 90% full charge following discharge
at 2400VA/1920W and 25°C
Output Voltage: 115V, ±2%
Output Frequency: 60Hz, ±0.1%
Output Current: 20.9A(RMS)
Output Distortion: 2% THD, maximum with linear load
Output Power: 1920W with resistive load;
2400VA/1920W with a reactive load or a non-linear load
Efficiency: 77%
AC to Battery Crossover: 159V, maximum low-line voltage;
232V, minimum high-line voltage
Battery to AC Crossover: 169V, maximum low-line voltage;
232V, minimum high-line voltage
AC Input Voltage Unbalance: 7V (RMS) maximum difference in line voltages
Temperature: 0°C to 40°C (32°F to 104°F), operating;
-40°C to 65°C (-40°F to 149°F), non-operating
Humidity: 5% to 95% non-condensing, operating
Altitude: 0 to 10,000ft, operating;
0 to 40,000ft, 2000ft/min, maximum, non-operating
Dimensions: 7"H x 19"W x 25.1"D,
excluding protrusion of handles, controls, and connectors;
fits standard RETMA rack
Weight: 75lb (34kg), UPS enclosure;
48lb (22kg) battery module;
123lb (56kg) total weight

SECTION 2
2.1 Introduction
INSTALLATION
The Elgar Model GUPS 2400A-107 has been aligned, calibrated, and tested prior to shipment.
The instrument is ready for immediate use upon receipt. However, the following checks should
be made to ensure that the instrument was not damaged during shipment.
CAUTION!
The GUPS 2400A-107 weighs 75 pounds (34 kg) without the
battery pack. The battery pack adds an additional 48 pounds
(22 kg). A minimum two–person lift is required!
WARNING
Hazardous voltages are present when operating this equipment.
Please read the SAFETY NOTICE on page ii prior to installation,
operation, or maintenance.
2.2 Unpacking and Inspection
Perform a visual inspection of the shipping container prior to accepting the package from the
carrier. If extensive damage is evident, a description of the damage should be noted on the
carrier's receipt and signed by the driver of the carrier agent.
If damage is not apparent until the instrument is unpacked, a claim for concealed damage
should be placed with the carrier. Check for shipping damage such as dents, scratches,
distortion, and damaged connectors. If the instrument or container(s) show signs of rough
handling, remove the covers from the instrument to ensure that the circuit boards are securely in
place and that no loose or broken components are evident.
In addition, the shipping container(s) and filler material should be saved for inspection. Forward
a report of damage to the Elgar Service Department. Elgar will provide instructions for repair or
replacement of the instrument.
GUPS 2400A–107 Operation Manual 2-1

Installation
2-2 GUPS 2400A–107 Operation Manual
When returning the instrument to Elgar, suitable shipping containers and packing material must
be used. If the instrument needs to be shipped and proper packing material is not available,
contact Elgar to provide containers and shipping instructions.
2.3
2.4
Installation
The Model GUPS 2400A-107 is 7" (178 mm) high and is designed to be installed in a standard
19" (483 mm) wide cabinet enclosure or a transit case.
Refer to Figure 2–1 through Figure 2–3 for information on outline and mounting dimensions.
Air Intake and Exhaust
The air intake is located on the front panel of the instrument and the exhaust is through the rear
panel. Care must be taken not to block the air intake and exhaust. No special vertical
separation is required when stacking instruments. However, a 1¾" (44.5 mm) vertical spacer
above and below the instrument may improve cooling.
CAUTION!
Avoid blocking the instrument air intakes or exhaust.
2.5 Input/Output Connectors
Table 2–1 provides a listing of the GUPS 2400A-107 input and output connectors.
J1: AC Input Connector
Panel Connector MS3102E20-4P
Mating Connector MS3456W20-4S
J2: AC Output Connector
Panel Connector MS3102E20-19S
Mating Connector MS3456W20-19P
J3: Data/Alarm Port Connector
Panel Connector MS3470W12-8S
Mating Connector MS3476W12-8P
Table 2–1. GUPS 2400A-107 Input/Output Connectors

Installation
GUPS 2400A–107 Operation Manual 2-3
Figure 2–1. GUPS 2400A-107 (Front View)

Installation
2-4 GUPS 2400A–107 Operation Manual
Figure 2–2. GUPS 2400A-107 (Rear View)

Installation
GUPS 2400A–107 Operation Manual 2-5
Figure 2–3. GUPS 2400A-107 Dimensions (Top, Side, and Front Views)

Installation
2-6 GUPS 2400A–107 Operation Manual
2.6 Wire Gauge Selection
The following guidelines assist in determining the optimum cable specification for the user's
power applications. These guidelines are equally applicable to both DC and low frequency AC
(up to 450 Hz) power cabling. The same engineering rules apply whether going into or out of an
electrical device. Thus, this guide applies equally to the input cable and output cable for this
Elgar instrument and application loads.
Power cables must be able to safely carry maximum load current without overheating or causing
insulation destruction. It is important to everyday performance to minimize IR (voltage drop)
loss within the cable. These losses have a direct effect on the quality of power delivered to and
from instruments and corresponding loads.
When specifying wire gauge, the operating temperature needs to be considered. Wire gauge
current capability and insulation performance drops with the increased temperature developed
within a cable bundle and with increased environmental temperature. Thus, short cables with
generously derated gauge and insulation properties are recommended for power source
applications.
Avoid using published commercial utility wiring codes. These codes are designed for the
internal wiring of homes and buildings and accommodate the safety factors of wiring loss, heat,
breakdown insulation, aging, etc. However, these codes consider that up to 5% voltage drop is
acceptable.
Such a loss directly detracts from the quality performance specifications of this instrument.
Frequently, these codes do not consider bundles of wire within a cable arrangement.
In high performance applications, as in motor start-up and associated inrush/ transient currents,
additional consideration is required. The cable wire gauge must consider peak voltages and
currents which may be up to ten times the average values. An underrated wire gauge adds
losses which alter the inrush characteristics of the application and thus the expected
performance.
Table 2–2 identifies popular ratings for DC and AC power source cable wire gauges.
Column 1
Size
(AWG)
Column 2
Amperes
(Maximum)
Column 3
Ohms/100 Feet
(One Way)
Column 4
IR Drop/100 Feet
(Col. 2 X Col. 3)
14 15 0.257 3.85
12 20 0.162 3.24
10 30 0.102 3.06
8 40 0.064 2.56
6 55 0.043 2.36
4 70 0.025 1.75
2 95 0.015 1.42
1/0 125 0.010 1.25
3/0 165 0.006 1.04
Table 2–2. Recommended Wire Gauge Selection Guide

Installation
GUPS 2400A–107 Operation Manual 2-7
The following notes apply to Table 2–2 and to the power cable definition:
1. The above figures are based upon insulated copper conductors at 25°C (77°F), two current
carrying conductors in the cable plus a safety (chassis) ground.
Columns 3 and 4 refer to "one way" ohms and IR drop of current carrying conductors
(e.g., a 50-foot cable contains 100 feet of current carrying conductor).
2. Determine which wire gauge for the application by knowing the expected peak load current
(Ipeak), the maximum tolerated voltage loss (Vloss) within the cable, and the one way cable
length. The formula below determines which ohms/100 feet entry is required from Column
3. Read the corresponding wire gauge from Column 1.
(Column 3 value) = Vloss/[Ipeak x 0.02 x (cable length)]
Where:
Column 3 value = Entry of the table above.
Cable length = One way cable length in feet.
Vloss = Maximum loss, in volts, permitted within cable.
SPECIAL CASE:
Should the Vloss requirement be very loose, Ipeak may exceed the maximum amperes
(Column 2). In this case, the correct wire gauge is selected directly from the first two
columns of the table.
EXAMPLE:
A 20 ampere (Ipeak) circuit which may have a maximum 0.5 volt drop (Vloss) along its 15-
foot cable (one way cable length) requires (by formula) a Column 3 resistance value of
0.083. This corresponds to wire gauge size 8 AWG.
If the cable length was 10 feet, the Column 3 value would be 0.125 and the
corresponding wire gauge would be 10 AWG.
3. Aluminum wire is not recommended due to soft metal migration at the terminals which may
cause long term (on the order of years) poor connections and oxidation. If used, increase the
wire gauge by two sizes (e.g., specify 10 gauge aluminum instead of 14 gauge aluminum).
4. Derate the above wire gauge (use a heavier gauge) for higher environmental temperatures
since conductor resistance increases with temperature.
Temperature Current
°C °F Capability
40 104 80%

Installation
2-8 GUPS 2400A–107 Operation Manual
5. Derate the above wire gauge (use a heavier gauge) for an increased number of current carrying
conductors. This offsets the thermal rise of bundled conductors.
Number of Current
Conductors Capability
3 to 6 80%
Above 6 70%
6. The preferred insulation material is application dependent. Elgar recommends any flame
retardant, heat resistant, moisture resistant thermoplastic insulation rated to a nominal 75°C
(167°F). Voltage breakdown must exceed the combined effects of:
•The rated output voltage;
•Transient voltages induced onto the conductors from any source;
• The differential voltage to other nearby conductors; and,
• Safety margins to accommodate degradations due to age, mechanical abrasion and
insulation migration caused by bending and temperature.
7. As frequency increases, the magnetic field of the current carrying conductors becomes more
significant in terms of adverse coupling to adjacent electrical circuits. Use twisted pairs to
help cancel these effects. Shielded twisted pairs are even better. Avoid close coupling with
nearby cables by using separate cable runs for high power and low power cables.
8. The above general values and recommendations should be reviewed, modified and
amended, as necessary, for each application. Cables should be marked with appropriate
safety WARNING decals as hazardous voltages may be present.

SECTION 3
3.1
3.2
3.2.1 Indicators
OPERATION
Introduction
This section provides detailed information on the controls and indicators, input/output
connections, start-up and shutdown sequences, battery operation, and the RS-232 data
communications port.
Control and Indicator Panel
All controls and indicators for the GUPS 2400A-107 are located on the front panel of the unit.
There are no operator adjustments inside the unit. Refer to Figure 3–1 for the location of the
controls and indicators listed below.
There are eight indicators and three pushbutton switches on the panel. In addition, there is an
input circuit breaker located below the control panel.
AC INPUT
Three green LED’s that indicate the presence of line voltage at the AC input. The indicators turn
on when the line voltage is greater than 90V (phase voltage greater than 52V).
ON BATT
An amber LED that indicates the loss of AC input and operation from battery power.
BATT
A three-color LED that indicates the condition of the battery. The LED is green under normal
operating conditions, amber when the battery is discharging or has low capacity while charging,
and red when the battery capacity is low and impending inverter shutdown is approached.
LOAD
A three-color LED that indicates the amount of output load. The LED is green when the load is
less than 80% of maximum output, amber when the load is within 80% to 105%, and red when
the load exceeds 105% (indicating that the inverter will shut down if the load is maintained).
GUPS 2400A–107 Operation Manual 3-1

Operation
3-2 GUPS 2400A–107 Operation Manual
TEMP
A two-color LED that indicates an over-temperature condition within the GUPS. The LED is
green under normal operating conditions and red when an over-temperature shutdown occurs.
TEST
A two-color LED that indicates the results of the internal self-test. The LED blinks while a self-
test is in progress. When the test is complete, the LED turns green if the test is passed and red
it the test is failed.
Figure 3–1. GUPS 2400A-107 Control and Indicator Panel

Operation
GUPS 2400A–107 Operation Manual 3-3
3.2.2
3.3
3.4
3.5
Pushbutton Switches
OUTPUT ON
A momentary pushbutton switch on the front panel that alternately turns the output power on
and off.
TEST
A momentary push button switch on the front panel that initiates the internal self-test.
ALARM SILENCE
A momentary pushbutton switch on the front panel that silences the audible alarm.
Circuit Breaker
The AC input breaker is located on the front panel below the Control and Indicator Panel.
It is turned ON by pushing in the actuator button, and it is turned OFF by pulling out the actuator
button.
Audible Alarm
An audible alarm is sounded for the following alarm conditions: loss of AC input; low battery
voltage; over-temperature. If the audible alarm is silenced and an alarm condition is again
present, the audible alarm will again be sounded.
Control Signals
The Data/Alarm Port provides an interface to remote alarms or a host computer. The control
signals provide annunciation of the mode of operation, control of the system shutdown, and RS-
232 data communications. The control signals of the Data/Alarm Port and their signal return
could be floated up to 80VPK above chassis ground.
AC FAIL
Normally-open relay contacts that close when the AC input is outside the allowed range for
voltage or phase unbalance.
LOW BATTERY
Normally-open relay contacts that close when the battery voltage approaches the shutdown
threshold for the inverter.
SHUTDOWN
Input to a relay coil whose contacts interface with the control circuits of the GUPS. Energizing
the relay with a DC voltage, 16.8-36VDC (1,070 ±10% coil resistance), will result in shutdown.
If SHUTDOWN is asserted while the AC input is present, the output relay will open and output
power will be turned off; the inverter and control circuits will continue to operate.

Operation
3-4 GUPS 2400A–107 Operation Manual
If SHUTDOWN is asserted while the AC input is not present and the inverter is running from the
battery, the output relay will open and output power will be turned off; the inverter and control
circuits will also be shut down. After shutdown, the OUTPUT ON switch must be manually
toggled to turn the output back on.
RS-232 TRANSMIT/RECEIVE
RS-232 transmit and receive for data communications. Refer to Section 3.9 for more information
on RS-232 interface.
OUTPUT CURRENT
An AC voltage signal that is proportional to the AC output current. The output is 0.221V/A, or
4.6 VRMS at full load. This signal is transformer isolated from the other control signals.
3.6 Connectors
The GUPS 2400A-107 has cylindrical, metal-shell connectors with bayonet coupling for all
input/output connections of power and signal. All connectors are located on the rear panel.
Pin assignments are listed in Table 3–1.
Connector Pin Assignment
Connector J1,
AC INPUT
Pin A: Phase A
Pin B: Phase B
Pin C: Phase C
Pin D: Chassis Ground
(Neutral not used)
Connector J2,
AC OUTPUT
Pin A: Line
Pin B: Neutral (internally connected to chassis)
Pin C: Chassis Ground
Connector J3,
DATA/ALARM PORT
Pin A: AC FAIL normally-open relay contact
Pin B: LOW BATTERY normally-open relay contact
Pin C: SHUTDOWN input for remote shutdown
Pin D: RS-232 TRANSMIT signal (output)
Pin E: RS-232 RECEIVE signal (input)
Pin F: SIGNAL RETURN for signals on Pins A-E
Pin G: OUTPUT CURRENT sense signal
Pin H: Return for OUTPUT CURRENT sense signal
GROUND STUD #10-32 Stud: Earth Ground
Table 3–1. GUPS 2400A-107 Connector Pin Assignments