Basler BE1-CDS220 User manual

BE1-CDS220
UHP-5
8-07
BE1-CDS220
CURRENT DIFFERENTIAL
PROTECTION SYSTEM
ADVANTAGES
• All versions include harmonic restraint as well as phase shift and tap
compensation for use in transformer applications. Detailed current check report
provides record of proper CT connections.
• Includes frequency compensation for high accuracy in generator and motor
differential applications.
• BESTlogic provides the user with complete flexibility in configuring a protection
and control system. User programmable variable and switch names make the
CDS relays completely self-documenting.
• Each CT circuit is low burden and isolated to allow improving zones of protection
with fewer costly CTs.
• Optional programmable LCD display allows the relay to replace local indication
and control functions such as panel metering, alarm annunciation, and control
switches.
• Three independent communications ports with protocol support allow integration
with distributed control systems.
• The CDS220 is available in horizontal and vertical configurations to provide cost
savings in any installation. The CDS220 is fully drawout and fits cutout, drilling,
and behind-panel projection dimensions for common Basler Electric, GE, and
Westinghouse differential relays.
FEATURES
Pages 2 and 3
APPLICATIONS
Page 4
FUNCTIONAL
DESCRIPTION
Pages 4 - 6
BESTlogic
Pages 8 and 9
SPECIFICATIONS
Pages 7, 10 - 11
ORDERING
INFORMATION
Page 12
INSTRUCTION MANUAL MODBUS™ INSTRUCTION MANUAL
Request publication 9313900990 Request publication 9313900991
DNP 3.0 INSTRUCTION MANUAL
Request publication 9313900992
ADDITIONAL INFORMATION
The BE1-CDS220 Current Differential Protection System is a 3 phase, 2
restraint multifunction, numerical relay that provides percentage restrained
differential protection along with overcurrent, breaker failure, control, metering,
monitoring, and alarm functions in an integrated system.
WINDOWS®SOFTWARE
Interface for setting and communicating with Basler protection products.
Request BESTCOMS for BE1-CDS (includes "settings compare" feature).
RTU
DEVICE FUNCTIONS
43 50 51 62
87N 87R 87U 101
BF DNP
Option Option
Modbus

BE1-CDS220
2
FEATURES
PROTECTION
• Percentage Restrained Current Differential with
harmonic restraint: 87
• Percent Restraint characteristic can be percent of
maximum or percent of average through current.
• 2nd Harmonic sharing feature enhances security to
transformer inrush.
• Optional Restricted Ground Fault: 87ND (requires
optional independent ground input)
• Phase, Neutral, and Negative Sequence Instanta-
neous Overcurrent elements with settable time
delay: 50TP, 150TP, 250TP, 50TN, 150TN, 250TN,
50TQ, 150TQ, 250TQ
• Phase, Neutral, Ground, and Negative Sequence
Time Overcurrent elements: 51P, 151P, 251P, 51N,
151N, 251N, 51Q, 151Q, 251Q
• All U.S. and IEC timing curves plus user
programmable curve
• Responds to fundamental component of the power
system currents
• Minimizes transient overreach and overtravel on
overcurrent elements
• Breaker Failure protection function: BF
• Two general purpose logic timers: 62, 162
• Programmable logic using BESTlogic
• Four protection settings groups with external or
automatic (cold load pickup, and/or dynamic)
selection modes
CONTROL
• Virtual Breaker Control Switch—controllable from
both HMI and com. ports: 101
• Eight virtual selector switches—controllable from
both HMI and com. ports: 43, 143, 243, 343, 443,
543, 643, 743
INSTRUMENTATION
• Real time A, B, C phase, neutral and negative
sequence currents for each 3 phase CT input
circuit
• Real time ground current for optional independent
ground input
• Real time tap and phase compensated restraint
and operate currents for each differential element
• Real time 2nd and 5th harmonic restraint currents
for each differential element
• 1% meter accuracy down to 10% nominal current
REPORTS
• Current Demands for phase, neutral and negative
sequence for designated CT input —
magnitudes and time stamps are recorded for
today's peak, yesterday's peak, and peak since
reset (calculation settable for thermal, sliding
block average, and block average)
• Optional 4000 point log of demand reading
• Breaker operations counter and contact wear duty
• Transformer through-fault duty statistics
FAULT RECORDING
• 255 event sequence of events report with I/O and
alarm sub-reports
• Fault Reporting; 1 or 2 oscillography records per
fault report
• Fault summary reports; two most recent Fault
Summary Records saved to non-volatile memory
• Total number of fault and oscillography records
settable from 6 to 16
• Total of 240 cycles oscillography memory @ 24
samples/cycle
• COMTRADE format
• SER and Fault reporting doubled when Load
Profile option is selected
COMMUNICATIONS PORTS
• Three independent general purpose communica-
tion ports
- Front RS-232 ASCII communications
- Rear RS-232 ASCII communications
- Rear RS-485 ASCII, Modbus®, or other common
protocols
• IRIG-B time sync (unmodulated)
SELF TEST AND ALARM FUNCTIONS
• Relay Fail, major alarm and minor alarm LEDs,
and fail-safe alarm output contact
• Extensive internal diagnostics monitor all internal
functions of the relay
• More than 20 additional alarm points —
programmable for major or minor priority,
including:
- Phase demand overload alarm
- Neutral and negative sequence unbalance
demand alarms
- Three breaker alarm points—programmable for
slow trip, interruption duty threshold, or
operations counter
- Three transformer alarm points—programmable
for through fault operations or accumulated
through fault duty
SELF TEST AND ALARM FUNCTIONS
- Transformer differential alarm monitors Iop/Ires
characteristics to alarm if nearing trip condition
on load. Diagnostics provide indication of
polarity, phase shift and tap mismatch condi-
tions
- Trip circuit voltage and continuity monitor
- Programmable logic alarms

BE1-CDS220
3
FEATURES, continued
Figure 2 - Optional Advanced HMI (Human Machine Interface)
CDS220 Horizontal Rack Mount version shown
PROGRAMMABLE I/O
• All current based functions are individually pro-
grammable for which CT input circuit is monitored
• Eight programmable contact sensing inputs
• Six programmable outputs and one dedicated
programmable alarm output
• Outputs 1 and 6 are high speed (1/4 cycle nominal)
• Output 6 is Form C
Figure 1 - Standard Front Panel
CDS220 Horizontal Rack Mount version shown
HARDWARE FEATURES
• Case configurations
- MX Vert: M1, M2/FT31, FT32 size, fully drawout
- MX Horiz: panel or 19" rack mount, fully drawout
• Active CT technology for low burden and
increased dynamic range
• Flash Memory for upgrading embedded
programming without changing chips
• Optional HMI with Graphic LCD display
• Optional cover (see below)

BE1-CDS220
4
FUNCTIONAL DESCRIPTION
The BE1-CDS relays use advanced digital signal
processing to enhance differential protection. Numeri-
cal technology allows this multifunction relay to
provide unprecedented flexibility, security, and perfor-
mance in differential protection.
Numerical design, with 16 bit A/D precision, fre-
quency tracking, digital filters, and active CTs
provides high accuracy and wide dynamic range,
resulting in wide settings ranges. The differential
protection element can even handle mismatch be-
tween current inputs with a tap adjust range of 10:1.
The percentage restrained differential element can be
set to respond to either percent of maximum through
current or percent of average through current. Maxi-
mum restraint is recommended, because it uses
information from the best-performing CT to restrain the
differential element. The flexibility provided by numeri-
cal design allows us to also offer average restraint to
emulate the operating characteristic of common
electromechanical differential relays.
APPLICATIONS
The BE1-CDS Current Differential Protection System provides percentage restrained differential protection along
with multiple overcurrent elements and is intended for use in any low impedance current differential protection
application including transformer, generator, motor, and bus protection. Its unique capabilities make it ideally
suited for applications with the following requirements:
• Applications that require low burden to extend the linear range of CTs.
• Applications where dedicated CTs for the differential are not available. Unlike traditional differential relays,
dedicated CT circuits are not required because each CT input is isolated from the others and phase shift
compensation can be accomplished internally.
• Applications that require high accuracy across a wide frequency range such as for motor, generator, and
generator step-up transformer protection or in cogeneration facilities.
• Applications that require the flexibility provided by wide settings ranges, multiple setting groups, and multiple
coordination curves in one unit.
• Applications that require the economy and space savings provided by a multifunction, multiphase unit. This
one unit can provide all the protection as well as local and remote indication, metering, and control required
on a typical circuit.
• Applications that require harmonic restraint to aid security for the differential.
• Applications that require communication capability and protocol support.
• Applications where the optional case configurations facilitate modernizing protection and control systems in
existing substations.
• Applications where the capabilities of a digital multifunction relay are required, yet drawout construction is also
desirable.
• Applications where bus protection is provided by a high speed overcurrent blocking scheme on the transformer
bus mains instead of dedicated bus differential circuit.
• Applications where the capabilities of intelligent electronic devices (IEDs) are used to decrease relay and
equipment maintenance costs.
To improve security from misoperation on false
differential caused by CT saturation, the differential
protection element includes a transient monitor that
monitors the restraint and operate currents to detect
false differential current caused by CT saturation. The
relay then modifies its response to enhance security
under this condition.
To improve security from misoperation during inrush in
transformer protection applications, the percentage
restrained differential element includes 2nd harmonic
restraint. Since the 2nd harmonic component of
inrush current may not be equally shared on all three
phases, misoperation can occur on a phase with low
2nd harmonic content. Our unique method of 2nd
harmonic sharing improves security by allowing the
harmonic restraint elements to respond to the ratio of
operate current to the sum of harmonic current mea-
sured on all three phases. This is superior to other
methods of cross blocking, since each phase element
operates independently in its comparison of operating
current to harmonic current. Thus, security is en-

BE1-CDS220
5
FUNCTIONAL DESCRIPTION, continued
hanced without sacrificing dependability, because a
faulted phase will not be restrained by inrush on
unfaulted phases.
To further enhance security from false tripping on
inrush, the operating characteristic responds only to
the fundamental component of this highly distorted
current – reducing sensitivity to inrush current, yet
allowing improved sensitivity to power system faults.
Advanced digital signal processing also provides
flexibility for application of differential relays with
simpler CT connections. Phase shift and zero se-
quence compensation can be done internally in the
relay, eliminating the need for special CT connections.
Connecting CTs in wye simplifies CT circuit checkout
and reduces burden on the CT circuit itself, reducing
the likelihood of misoperation caused by CT satura-
tion. The internal zero sequence compensation can
even accommodate additional ground sources such
as zig-zag grounding banks within the zone of protec-
tion.
With all CT inputs isolated and low burden, and the
ability to connect all CTs in wye, the need for dedi-
cated CTs for differential protection is eliminated,
allowing zones of protection to be improved with fewer
CTs required. However, the BE1-CDS can also accept
traditional differential CT connections to make retrofit
and modernization projects simple.
BESTlogic
BESTlogic programmable logic provides the user with
high flexibility in configuring a protection and control
system.
Each of the protection and control functions in the
BE1-CDS is implemented as an independent function
block that is equivalent to its single function, discrete
device counterpart. Each independent function block
has all the inputs and outputs that the discrete
component counterpart might have. Figures 6A and
6B show each of the independent function blocks
available for use in the BE1-CDS. Programming
BESTlogic is equivalent to choosing the devices
required by your protection and control scheme and
drawing schematic diagrams to connect the inputs
and outputs to obtain the desired operational logic.
The BE1-CDS relay can store, as user settings, one
user programmable, custom logic scheme. To save
you time, several preprogrammed logic schemes have
also been provided. Any of the preprogrammed
schemes may be copied into the logic settings without
making any additional BESTlogic settings.
BESTlogic provides the protection engineer with the
flexibility to set up this powerful multifunction system
with the same freedom that was once enjoyed with
single function, discrete devices. It is no longer
necessary to compromise your standard protection
and operating practices to deal with the limitations in
programmability of previous multifunction devices.
Figure 5 shows rear panel connections.

BE1-CDS220
6
Figure 5 - CDS220 Rear Panel Connections
FUNCTIONAL DESCRIPTION, continued
Figure 4 - Typical Application Single Line
* Based on preprogrammed logic TX-W-CTL. Not all
available protection and control functions are shown.
Figure 3 - Typical AC Connections
A
H1
OPTIONAL
TRANSFORMER
IA1
IB1
IC1
IG
IA2
IB2
IC2
X3X2X1
X0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
H2 H3H3
BC
ABC

BE1-CDS220
7
5 Amp CURRENT INPUTS
Continuous: 20 Amps
One Sec. Rating: 400 Amps
Saturation limit: 150 Amps
Burden: <10 milliohms @ 5A
1 Amp CURRENT INPUTS
Continuous: 4 Amps
One Sec. rating: 80 Amps
Saturation limit: 30 Amps
Burden: <22 milliohms @ 1A
A/D CONVERTERS
Sampling Rate: 144/cycle*
Output of digital filter: 24/cycle*
* Adjusted to input frequency 40-63Hz
POWER SUPPLY
Option L: DC Range 17 - 32V
Burden 12 W continuous, 17 W maximum
Option Y: DC Range 35 - 150V, AC Range 55 - 135V
Burden 11 W continuous, 15 W maximum
Option Z: DC Range 90 - 300V, AC Range 90 - 270V
Burden 10 W continuous, 13 W maximum
TRIP CONTACTS
Make and carry: 30A (0.2sec)
Continuous: 7A
Break: 0.3A DC (L/R=0.04)
CONTROL INPUTS
Wetting voltage range: Same as power supply option
PS Option L: Burden 16kohm
Nominal Turnon 16Vdc
PS Option Y: Low setting burden 37.5Kohm
Nominal Turnon 33Vdc
High setting burden 95Kohm
Nominal Turnon 83Vdc
PS Option Z: Low setting burden 95Kohm
Nominal Turnon 83Vdc
High setting burden 190Kohm
Nominal Turnon165Vdc
COMMUNICATION PORTS
Response Time: <100mSec for metering and
control functions
Baud Rate: 300 - 19200
500Vdc in accordance with UL-508
2000Vac hipot
ELECTRICAL ENVIRONMENT
• IEEE C37.90-1989 Standard for Relays and Relay
Systems Associated with Electric Power Apparatus
• IEC 255-5 Insulation Test for Electrical Relays
Impulse and Dielectric Strength (2000Vac at 50/60Hz)
• IEEE C37.90.1-1989 Standard Surge Withstand Cap-
ability Tests for Relays and Relay Systems Associated
with Electric Power Apparatus
• IEC 255-22-1 1MHz Burst Disturbance Tests for Elec-
trical Disturbance Tests for Measuring Relays and
Protection Equipment
• EN 61000-4-4 Electrical Fast Transient/Burst Immunity
Test
• EN 61000-4-3 Radiated, Radio-frequency, Electro-
magnetic Field Immunity Test
• Type tested using a 5-watt, hand-held transceiver in
the ranges of 144 and 440MHz with the antenna
placed within 6 inches of the relay.
• IEEE C37.90.3 (Jan. 01) Draft Standard Electrostatic
Discharge Tests for Protective Relays
• EN 61000-4-2 Electrostatic Discharge Immunity Test
MECHANICAL ENVIRONMENT
• Operating temperature range: -40°C to 70°C*
(-40°F to 158°F)
*LCD Display is inoperative below -20°C.
• Storage temperature range: -40°C to 70°C
(-40°F to 158°F)
• Humidity: Qualified to IEC 68-2-38, 1st Edition
1974, Basic Environmental Test Procedures,
Part 2: Test Z/AD: Composite Temperature
Humidity Cyclic Test
• Qualified to IEC 255-21-1 (Class 1) Vibration Tests
for Electrical Relays
• Qualified to IEC 255-21-2 (Class 1) Shock and Bump
Tests for Electrical Relays
CERTIFICATIONS
UL Recognized, File E97033
CSA Certified, File LR23131
CE Qualified, Meets or exceeds standards required for
distribution in the European Community.
Gost R Certified #POCC US.ME05.B03391.
DNP 3.0 IED Certified, Subset Level 2, by SUBNET
Solutions, Inc.
CASE SIZE (Vertical unit)
5.40" (137.16mm) W x 14.63" (371.6) H x 8.70" (220.98) D
behind panel
Alternate mounting: 5.40" (137.16) W x 14.63" (371.6) H
x 7.70" (195.58) D
CASE SIZE (Horizontal unit)
14.63" (371.6) W x 5.40" (137.16) H x 8.70" (220.98) D
behind panel
Alternate mounting:14.63" (371.6) W x 5.40" (137.16) H
x 7.70" (195.58) D
CASE SIZE (Rack mount)
14.63" (371.6) W x 5.22" (132.59) H x 8.70" (220.98) D
without flanges
SHIPPING WEIGHT
Approx. 16.5 pounds (7.5 kg)
GENERAL SPECIFICATIONS

BE1-CDS220
8
Figure 6A - CDS220 BESTlogic Function Blocks

BE1-CDS220
9
Figure 6B - CDS220 BESTlogic Function Blocks

BE1-CDS220
10
PERFORMANCE SPECIFICATIONS
PERCENTAGE RESTRAINED DIFFERENTIAL (87R)
Tap: 5A CT 2.0-20 Amps
1A CT 0.4-4.0 Amps
Minimum PU 0.10-1.00 times tap
Restraint Method Maximum
Average
Restraint Slope: 15-60%, off
2nd & 5th Harmonic 5-75%, off
Response Time: <2 cycles @ 5 x pickup
<3 cycles @ 1.5 x pickup
UNRESTRAINED DIFFERENTIAL (87U)
Unrestrained PU 1-21 times Tap up to 30
times I nominal, symmetrical
Response Time: <1 cycle @ 5 x pickup
<2 cycles @ 1.5 x pickup
RESTRICTED EARTH FAULT GROUND DIFFERENTIAL
(87ND)
Tap: 5A CT 2.0-20 Amps
1A CT 0.4-4.0 Amps
Minimum PU 0.10-1.00 times tap
Restraint Slope 15-60%
Constants
Curve
Type
S1
S2
L1
L2
D
M
I1
I2
V1
V2
E1
E2
A
B
C
G
F
P
A B C N K R
0.2663 0.03393 1.000 1.2969 0.028 0.5000
0.0286 0.02080 1.000 0.9844 0.028 0.0940
5.6143 2.18592 1.000 1.000 0.028 15.750
2.3955 0.00000 1.000 0.3125 0.028 7.8001
0.4797 0.21359 1.000 1.5625 0.028 0.8750
0.3022 0.12840 1.000 0.5000 0.028 1.7500
8.9341 0.17966 1.000 2.0938 0.028 9.0000
0.2747 0.1042 1.000 0.4375 0.028 0.8868
5.4678 0.10814 1.000 2.0469 0.028 5.5000
4.4309 0.0991 1.000 1.9531 0.028 5.8231
7.7624 0.02758 1.000 2.0938 0.028 7.7500
4.9883 0.0129 1.000 2.0469 0.028 4.7742
0.01414 0.00000 1.000 0.0200 0.028 2.0000
1.4636 0.00000 1.000 1.0469 0.028 3.2500
8.2506 0.00000 1.000 2.0469 0.028 8.0000
12.1212 0.00000 1.000 1.000 0.028 29.000
0.0000 1.00000 0.000 0.0000 0.028 1.0000
0 to 600 0 to 25 0 to 1 .5 to 2.5 0.028 0 to 30
S1, S2 = CO Short Inv, IAC Short Inv A= IEC Standard Inverse
L1, L2 = CO Long Inv, IAC Long Inv B= IEC Very Inverse
D= CO Definite Time C = IEC Extremely Inverse
M= CO Moderately Inverse G= IEC Long Time Inverse
I1, I2 = CO Inverse, IAC Inverse F= Fixed Time
V1, V2 = CO Very Inv, IAC Very Inv P= Programmable
E1, E2 = CO Ext Inverse, IAC Ext. Inverse
INSTANTANEOUS OVERCURRENT WITH
SETTABLE DELAY (50TP, 150TP, 250TP, 50TN,
150TN, 250TN, 50TQ, 150TQ, 250TQ)
Pickup: 5A CT 0.5-150.0 Amps
1A CT 0.1-30.0 Amps
Pickup Time: 1¼ cyc @ 5 times PU
2 cyc @ 1.5 times PU
4 cyc @ 1.05 times PU
Delay Time 0.00-60.0 Sec
PU time with TD=0.000 Sec
1¼ cyc for P, N, & G @ 5 x PU
2¼ cyc for Q @ 5 x PU
Delay time: 0.000 - 60 sec
Time Accuracy: ±0.5% or ±¼ cyc for P & N
±0.5% or ±1 cyc for Q
TIME OVERCURRENT (51P, 151P, 251P, 51N, 151N,
251N, 51Q, 151Q, 251Q)
Pickup: 5A CT 0.5-16.0 Amps
1A CT 0.1-3.2 Amps
Time Dial: TD=K=0-99 for 46 curve
TD=0.0 - 9.9 for all other curves
Time-Current Same curves as 51
Characteristics: elements
RESTRAINT CURRENT (IN MULTIPLES OF TAP)
MINIMUM PICKUP
=0.01TO1.00
TIMES TAP
OPERATING CURRENT (IN MULTIPLES OF TAP)
SLOPE = *100=(15 TO 60%)
I
I
OP
RESTR
3
3
214
5
2
1

BE1-CDS220
11
PERFORMANCE SPECIFICATIONS, continued
BREAKER FAILURE (BF)
Time: 50 - 999mSec
Dropout: 5A CT 0.5A
1A CT 0.1A
Time Accuracy: ±0.5% or (+1¼ cyc, -¼ cyc)
GENERAL PURPOSE LOGIC TIMERS
(62, 162, 262, 362)
Mode: PU/DO, 1 Shot Non-
Retrig., 1 Shot Retrig.,
Oscillator, Integrating,
andLatch
T1 and T2 Delay TIme: 0.000 - 9999 Sec.
Time Accuracy: ±0.5% or ±3/4 cyc
CURRENT PICKUP ACCURACY (All 50 and 51)
Phase and Ground: 5A 2% or 50mA
1A 2% or 10mA
Neutral and Negative 5A 3% or 75mA
Sequence: 1A 3% or 75mA
SETTING GROUPS
Setting Groups: 4
Control Modes: Automatic: CLP; Dynamic load
or unbalance
External: Discrete input logic
Binary: Input Logic
METERING
Current Range: 5A 0.5 to 15.0
1A 0.1 to 3.0
Current Accuracy: ±1% of reading, ±1 least
significant digital @ 25°C
Frequency: 40 - 63Hz
DEMANDS (IA, IB, IC, IN, IQ)
Demand Interval: 1 - 60 min.
Demand Mode: Thermal
Sliding Block Average
Block Average
BREAKER MONITORING
Duty Mode: I or I2
Duty Alarm Range: 0 - to 100%
Op Counter Alarm Range: 0 - 99999
Trip Time Alarm Range: 20 - 1000mSec
TRANSFORMER MONITORING
Accumulated Duty Alarm: 0-100%
Fault Counter Alarm: 0-99999

BE1-CDS220
ORDERING
SAMPLE STYLE NUMBER
The style number identification chart defines the electrical characteristics and operation features included in
BE1-CDS Relays. For example, if the style number were CDS220 E0E-N0Y-Y0N0R, the device would have the
following:
(E) - 5 Amp Nominal System with 5 Amp Independent Ground Input
(0) - No Option
(E) - 8 inputs, 6 programmable outputs, and 1 alarm output
(N) - No Option
(0) - No Option
(Y) - 48/125 Vac/dc Power Supply
(Y) - Six button HMI with graphic LCD
(0) - ASCII Communications
(N) - No Load Profile Recording
(0) - No Cover
(R) - Horizontal with 19" Rack Mount Brackets
STANDARD ACCESSORY
9180400109 MX Test Case with 2 CT Terminal Blocks.
Printed in U.S.A.
BE1-CDS220 0E 0 Y
N
COVER
NO OPTION NO OPTION
SENSING
INPUT TYPE INPUT/OUTPUT
RS-485 PORT
PROTOCOL
POWER
SUPPLY
FRONT PANEL
0) No cover
1) Cover
Y) With 6 button
HMI with LCD
Display
1 Amp Nominal Systems
5 Amp Nominal Systems
A) W/O Independent Gnd Input
B) 1 Amp Independent Gnd Input
D) W/O Independent Gnd Input
E) 5 Amp Independent Gnd Input
F) 1 Amp Independent Gnd Input
E) 8 Inputs, 6 Outputs and
1 Alarm Output
Doubles SER and oscillography memory.
NOTES:
0) ASCII
1) Modbus
3) DNP 3.0
Ô
L) 24 Vdc
Y) 48/125 Vac/dc
Z) 125/250 Vac/dc
LOAD
PROFILE
N) None
Y) 4000 Point
Data Array
MOUNTING
H) Horizontal Panel
Mount
R) Horizontal 19
Rack Mount
V) Vertical
Panel Mount
²