Bulletin No. LDA-E
Drawing No. LP0673
Released 04/13
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
www.redlion.net
MODEL LD - LARGE DC VOLT/CURRENT/PROCESS DISPLAY
2.25" & 4" HIGH RED LED DIGITS
PROGRAMMABLE SCALING AND DECIMAL POINTS
PROGRAMMABLE USER INPUT
DUAL 5 AMP FORM C RELAY
ALUMINUM NEMA 4X/IP65 CASE CONSTRUCTION
RS232/RS485 SERIAL COMMUNICATIONS
C
UL
R
US LISTED
51EB
IND. CONT. EQ.
3RSD
PROCESS CONTROL EQUIPMENT
C
UL
R
US LISTED
UNIVERSALLY POWERED
GENERAL DESCRIPTION
The Large Display is a versatile display available as a DC volt, current, or
process meter with scaling, serial communications and dual relay outputs. The 5
digit displays are available in either 2.25" or 4" high red LED digits with
adjustable display intensities. The 2.25" high models are readable up to 130 feet.
The 4" high models are readable up to 180 feet. Both versions are constructed
of a NEMA 4X/IP65 enclosure in light weight aluminum.
All models also come with dual Form C relay outputs and RS232 / RS485
serial communications.
SPECIFICATIONS
SAFETY SUMMARY
1.
DISPLAY:
5 digit, 2.25" (57 mm) or 4" (101 mm) intensity adjustable Red LED
(-99999 to 99999)
2.
POWER REQUIREMENTS:
AC POWER: 50 to 250 VAC 50/60 Hz, 26 VA
DC POWER: 21.6 to 250 VDC, 11 W
DC Out: +24 VDC @ 100 mA if input voltage is greater than 50 VAC/VDC
+24 VDC @ 50 mA if input voltage is less than 50 VDC
Isolation: 2300 Vrms for 1 min. to all inputs and outputs
3.
INPUT RANGES:
Jumper Selectable
D.C. Voltages:
200 mV, 2 V, 20 V, 200 V, 10 V
INPUT
RANGE
ACCURACY @
23
°
C LESS
THAN 85% RH
INPUT
IMPEDANCE
MAX
INPUT
SIGNAL
RESOLUTION
TEMP.
COEFFICIENT
All safety regulations, local codes and instructions that appear in this and
corresponding literature, or on equipment, must be observed to ensure personal
safety and to prevent damage to either the instrument or equipment connected to
it. If equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
200 mV
2V
10 V
20 V
200 V
0.1% of span
0.1% of span
0.1% of span
0.1% of span
0.1% of span
ACCURACY @
23
°
C LESS
THAN 85% RH
1.033 M
Ω
1.033 M
Ω
1.033 M
Ω
1.033 M
Ω
1.033 M
Ω
INPUT
IMPEDANCE
75 VDC
75 VDC
250 VDC
250 VDC
250 VDC
MAX
INPUT
SIGNAL
10 µV
0.1 mV
1 mV
1 mV
10 mV
70 ppm /°C
70 ppm /°C
70 ppm /°C
70 ppm /°C
70 ppm /°C
CAUTION: Risk of Danger.
Read complete instructions prior to
installation and operation of the unit.
CAUTION:
Risk of electric shock.
D.C. Currents:
200
µA,
2 mA, 20 mA, 200 mA
INPUT
RANGE
RESOLUTION
TEMP.
COEFFICIENT
The protective conductor terminal is bonded to conductive
parts of the equipment for safety purposes and must be
connected to an external protective earthing system.
200 µΑ
2 mA
20 mA
200 mA
0.1% of span
0.1% of span
0.1% of span
0.1% of span
1.111 K
Ω
111
Ω
11
Ω
1
Ω
15 mA
50 mA
150 mA
500 mA
10 nA
0.1 µA
1 µA
10 µA
70 ppm /°C
70 ppm /°C
70 ppm /°C
70 ppm /°C
D.C. Process:
4 to 20 mA, 1 to 5 VDC, 0/1 to 10 VDC
ORDERING INFORMATION
MODEL NO. DESCRIPTION
PART NUMBER
INPUT RANGE
SELECT RANGE
4 - 20 mA
1 - 5 VDC
1 - 10 VDC
Use the 20 mA range
Use the 10V range
Use the 10V range
LD2A
LD4A
LD Plug
2.25" High 5 Digit Red LED Volt/Current Meter w/
Relay Output and RS232/RS485 Serial Comms
4" High 5 Digit Red LED Volt/Current Meter w/
Relay Output and RS232/RS485 Serial Comms
Panel Meter Plug for LD models
LD2A05P0
LD4A05P0
LDPLUG00
4.
OVERRANGE/UNDERRANGE INDICATION:
Input Overrange Indication:
“
OLOL
”.
Input Underrange Indication:
“
ULUL
”.
Display Overrange/Underrange Indication:
“
.....
”/“-
.....
”
DIMENSIONS In inches (mm)
X
Z
PART
NUMBER
X (Length)
Y (Height)
Z (Center)
Y
LD2A05P0 16 (406.4)
LD4A05P0 26 (660.4)
4 (101.6)
12 (304.3)
7.875 (200) 22 (558.8)
AIR PRESSURE STABILIZATION VENT
2.25
(57.15)
1
5.
A/D CONVERTER:
16 bit resolution
A/D Conversion Rate:
6 readings/sec.
6.
DISPLAY RESPONSE TIME:
500 msec min.
7.
USER INPUT:
Software selectable pull-up (8.6 KΩ) or pull-down resistor
(3.9 KΩ) that determines active high or active low input logic.
Trigger levels: V
IL
= 1.0 V max; V
IH
= 2.4 V min; V
MAX
= 28 VDC
Response Time: 5 msec typ.; 50 msec debounce (activation and release)
8.
COMMUNICATIONS:
Type:
RS485 or RS232
Isolation To Sensor & User Input Commons:
500 Vrms for 1 min.
Working Voltage: 50 V. Not Isolated from all other commons.
Data:
7/8 bits
Parity:
no, odd or even
Baud Rate:
300 to 38.4 K
Bus Address:
Selectable 0 to 99, Max. 32 meters per line (RS485)
9.
MEMORY:
Nonvolatile E
2
PROM retains all programming parameters and
max/min values when power is removed.
10.
OUTPUT:
Type:
Single FORM-C relay
Isolation To Sensor & User Input Commons:
1400 Vrms for 1 min.
Working Voltage: 150 Vrms
Contact Rating:
5 amps @ 120/240 VAC or 28 VDC (resistive load), 1/8
H.P. @ 120 VAC (inductive load)
Life Expectancy:
100,000 minimum operations
Response Time:
Turn On Time: 4 msec max.
Turn Off Time: 4 msec max.
11.
ENVIRONMENTAL CONDITIONS:
Operating temperature: 0 to 65 °C
Storage temperature: -40 to 70 °C
Operating and storage humidity: 0 to 85% max. RH (non-condensing)
Vibration to IEC 68-2-6: Operational 5 to 150 Hz, 2 g (1 g relay).
Shock to IEC 68-2-27: Operational 30 g (10 g relay).
Altitude: Up to 2,000 meters
12.
CONNECTIONS:Internal
removable terminal blocks
Wire Strip Length: 0.4" (10 mm)
Wire Gage: 24-12 AWG copper wire, 90°C rated insulation only
Torque: 5.3 inch-lbs (0.6 N-m) max.
Cable Diameter: Outside diameter must be 0.181" (4.6 mm) to 0.312" (7.9
mm) to maintain NEMA 4 rating of cord grips.
13.
CONSTRUCTION:
Aluminum enclosure, and steel side panels with textured
black polyurethane paint for scratch and corrosion resistance protection. Meets
NEMA 4X/IP65 specifications. Installation Category II, Pollution Degree 2.
14.
CERTIFICATIONS AND COMPLIANCES:
SAFETY
UL Listed, File # E137808, UL508, CSA C22.2 No. 14-M95
File # E179259, UL61010-1, CAN/CSA C22.2 No. 61010-1
LISTED by Und. Lab. Inc. to U.S. and Canadian safety standards
Type 4X Enclosure rating, UL50
IECEE CB Scheme Test Report #E179259-A3-CB-1
Issued by Underwriters Laboratories, Inc.
IEC 61010-1, EN 61010-1: Safety requirements for electrical equipment
for measurement, control, and laboratory use, Part 1.
IP65 Enclosure rating, IEC 529
ELECTROMAGNETIC COMPATIBILITY
Emissions and Immunity to EN 61326: Electrical Equipment for Measurement,
Control and Laboratory use.
Immunity to Industrial Locations:
Electrostatic discharge
EN 61000-4-2
Criterion B
4 kV contact discharge
8 kV air discharge
Electromagnetic RF fields
EN 61000-4-3
Criterion B
10 V/m
Fast transients (burst)
EN 61000-4-4
Criterion B
2 kV power
1 kV signal
Surge
EN 61000-4-5
Criterion A
1 kV L-L,
2 kV L&N-E power
RF conducted interference
EN 61000-4-6
Criterion B
3 V/rms
Voltage dip/interruptions
EN 61000-4-11 Criterion A
0.5 cycle
Emissions:
Emissions
EN 55011
Class A
Notes:
1. Criterion A: Normal operation within specified limits.
2. Criterion B: Temporary loss of performance from which the unit self-
recovers.
15.
WEIGHT:
LD2A05XX - 4.5 lbs (2.04 kg)
LD4A05XX - 10.5 lbs (4.76 kg)
1.0 I
nstallIng
INSTALLATION
INSTALLATION ENVIRONMENT
the
M
eter
MOUNTING INSTRUCTIONS
This display is designed to
be wall mounted or
suspended from a ceiling
truss or other suitable
structure capable of
supporting the LDA.
Caution
should
be
exercised when hanging
the display to provide for
the safety of personnel. If
hanging the LDA, run the
suspension cables (or chains)
through the mounting bracket
holes. For wall mounting use
#10-32 size bolts.
MOUNTING HOLE (.281")
The meter meets NEMA 4X/IP65 requirements when properly installed.
The unit should be installed in a location that does not exceed the operating
temperature. Placing the unit near devices that generate excessive heat should
be avoided. The unit should only be cleaned with a soft cloth and neutral soap
product. Do NOT use solvents.
Continuous exposure to direct sunlight may accelerate the aging process of
the front overlay. Do not use tools of any kind (screwdrivers, pens, pencils, etc.)
to operate the keypad of the unit.
TERMINAL #3 (TBA)
MUST BE
CONNECTED TO
2.0 s
ettIng
INPUT RANGE JUMPER
the
J
uMpers
20 V/200 V
10 V
200 MV/2 V
200 µA
2 MA
20 MA
200 MA
RANGE SELECT
This jumper is used to select the proper input range. The input range selected
in programming must match the jumper setting. Select a range that is high
enough to accommodate the maximum signal input to avoid overloads. To
access the jumper, remove the side cover of the meter.
Warning:
Exposed line voltage exists on the circuit boards.
Remove all power to the meter and load circuits before accessing
inside of the meter.
2
1
2
3
4
5
6
TBC
3.0 W
IrIng
the
M
eter
WIRING OVERVIEW
Electrical connections are made via pluggable terminal blocks located inside
the meter. All conductors should conform to the meter's voltage and current
ratings. All cabling should conform to appropriate standards of good installation,
local codes and regulations. It is recommended that the power supplied to the
meter (DC or AC) be protected by a fuse or circuit breaker. When wiring the
meter, compare the numbers on the label on the back of the meter case against
those shown in wiring drawings for proper wire position. Strip the wire, leaving
approximately 0.4" (10 mm) bare lead exposed (stranded wires should be tinned
with solder.) Insert the lead under the correct screw clamp terminal and tighten
until the wire is secure. (Pull wire to verify tightness.) Each terminal can accept
up to one #14 AWG (2.55 mm) wire, two #18 AWG (1.02 mm), or four #20
AWG (0.61 mm). Use copper conductors only, with insulation rated at 90°C.
EMC INSTALLATION GUIDELINES
Although Red Lion Controls Products are designed with a high degree of
immunity to Electromagnetic Interference (EMI), proper installation and wiring
methods must be followed to ensure compatibility in each application. The type
of the electrical noise, source or coupling method into a unit may be different
for various installations. Cable length, routing, and shield termination are very
important and can mean the difference between a successful or troublesome
installation. Listed are some EMI guidelines for a successful installation in an
industrial environment.
1. A unit should be mounted in a metal enclosure, which is properly connected
to protective earth.
2. Use shielded cables for all Signal and Control inputs. The shield connection
should be made as short as possible. The connection point for the shield
depends somewhat upon the application. Listed below are the recommended
methods of connecting the shield, in order of their effectiveness.
a. Connect the shield to earth ground (protective earth) at one end where the
unit is mounted.
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is over 1 MHz.
3. Never run Signal or Control cables in the same conduit or raceway with AC
power lines, conductors, feeding motors, solenoids, SCR controls, and
heaters, etc. The cables should be run through metal conduit that is properly
grounded. This is especially useful in applications where cable runs are long
and portable two-way radios are used in close proximity or if the installation
is near a commercial radio transmitter. Also, Signal or Control cables within
an enclosure should be routed as far away as possible from contactors, control
relays, transformers, and other noisy components.
4. Long cable runs are more susceptible to EMI pickup than short cable runs.
5. In extremely high EMI environments, the use of external EMI suppression
devices such as Ferrite Suppression Cores for signal and control cables is
effective. The following EMI suppression devices (or equivalent) are
recommended:
Fair-Rite part number 0443167251 (RLC part number FCOR0000)
Line Filters for input power cables:
Schaffner # FN2010-1/07 (Red Lion Controls # LFIL0000)
6. To protect relay contacts that control inductive loads and to minimize radiated
and conducted noise (EMI), some type of contact protection network is
normally installed across the load, the contacts or both. The most effective
location is across the load.
a. Using a snubber, which is a resistor-capacitor (RC) network or metal oxide
varistor (MOV) across an AC inductive load is very effective at reducing
EMI and increasing relay contact life.
b. If a DC inductive load (such as a DC relay coil) is controlled by a transistor
switch, care must be taken not to exceed the breakdown voltage of the
transistor when the load is switched. One of the most effective ways is to
place a diode across the inductive load. Most RLC products with solid state
outputs have internal zener diode protection. However external diode
protection at the load is always a good design practice to limit EMI.
Although the use of a snubber or varistor could be used.
RLC part numbers: Snubber: SNUB0000
Varistor: ILS11500 or ILS23000
7. Care should be taken when connecting input and output devices to the
instrument. When a separate input and output common is provided, they
should not be mixed. Therefore a sensor common should NOT be connected
to an output common. This would cause EMI on the sensitive input common,
which could affect the instrument’s operation.
Visit RLC’s web site at http://www.redlion.net/Support/InstallationConsiderations.
html for more information on EMI guidelines, Safety and CE issues as they
relate to Red Lion Controls products.
WIRING CONNECTIONS
Internal removable terminal
blocks are used for power and
signal wiring. Access to
terminal blocks is through
conduit fittings. Remove end
plates with ¼" nut driver. For
LD4 versions, all wiring is on
right side of unit. For LD2
versions, power and relay
wiring is on the right side and
the input, serial, DC out and
user input is on the left side.
Connect drain wire from
shielded cable(s) to screw on
side plate for proper grounding.
LD4
1
TBA
2
3
1
2
3
4
5
6
TBB
Front
1
2
3
4
5
6
1
2
3
4
5
RANGE SELECT
TBC
TBD
LD2
TBC
RANGE SELECT
3
4
5
6
Front
RIGHT SIDE VIEW
LEFT SIDE VIEW
3.1 POWER WIRING
The power wiring is made via the 3 position terminal block (TBA) located
inside the unit (right side). The DC out power is located: LD2 - left side, LD4
- right side
Power
Terminal 1: VAC/DC +
Terminal 2: VAC/DC -
Terminal 3: Protective Conductor
Terminal
+
-
1 L1
2 L2
3
3
DC Out Power
TBA
Terminal 4: + 24 VDC OUT
Terminal 6: User Common
4 + EXC
6
USER COMM
1
TBB
2
TBD
3
4
5
1
2
1
TBA
2
3
1
2
3
4
5
6
Front
TBC
3.2 USER INPUT WIRING
The User Input is located: LD2 - left side, LD4 - right side
Terminal 5: User Input
Terminal 6: User Comm
Sinking Logic
Sourcing Logic
5 USER
6 USER COMM
3.3 SETPOINT (OUTPUT) WIRING
The setpoint relays use a six position terminal block (TBB) located inside the
(right side).
Terminal 1: NC 1
Terminal 2: NO 2
Terminal 3: Relay 1 Common
Terminal 4: NC 1
Terminal 5: NO 2
Terminal 6: Relay 2 Common
1 N.C. 1
2 N.O. 1
3 COMM 1
4 N.C. 2
5 N.O. 2
6 COMM 2
TBB
3.4 INPUT WIRING
Before connecting signal wires, the Input Range Jumper should be verified
for proper position.
VOLT INPUT
1
INPUT COMMON
2
TBC
CURRENT INPUT
3
+24 VDC EXC.
4
USER INPUT
5
USER/EXC. COMMON
6
20 V/200 V
10 V
200 MV/2 V
200 µA
2 MA
20 MA
200 MA
CAUTION:
Analog common is NOT isolated from user input
common. In order to preserve the safety of the meter application,
the DC common must be suitably isolated from hazardous live
earth referenced voltage; or input common must be at protective
earth ground potential. If not, hazardous voltage may be present
at the User Input and Input Common terminals. Appropriate
considerations must then be given to the potential of the input
common with respect to earth ground. Always connect the
analog signal common to terminal 2.
3.5 INPUT SIGNAL WIRING
Voltage Signal
(self powered)
Terminal 1: +VDC
Terminal 2: -VDC
ANALOG COMM
Current Signal
(self powered)
Terminal 3: +ADC
Terminal 2: -ADC
ANALOG COMM
Current Signal (2 wire
requiring excitation)
Terminal 4: +EXC
Terminal 3: +ADC
CURRENT
Current Signal (3 wire
requiring excitation)
ANALOG COMM
Terminal 3: +ADC (signal)
Terminal 2: -ADC (common)
Terminal 4: +EXC
VOLT
CURRENT
CURRENT
+ EXC.
1
+
-
2
2
3
Load
3
-
2 WIRE
TRANSMITTER
4
+
Voltage Signal (3 wire
requiring excitation)
VOLT
Terminal 1: +VDC (signal)
Terminal 2: -VDC (common)
Terminal 4: +EXC
1
V
out
2
COMM
3
I
out
200 VDC MAX.
-
+
3 WIRE TRANSMITTER
200 MA DC MAX.
4
+ EXC.
-
TBC
5 USER
6 USER COMM
+
TBC
4
3.6 SERIAL WIRING
RS232 Communications
The serial connections are made via terminal block TBD located inside the
unit on the left side for the LD2 and on the right side for the LD4.
TXD
1
RXD
2
TBD
COMM
3
A
4
B
5
232
485
RS232 is intended to allow two devices to communicate over distances up to
50 feet. Data Terminal Equipment (DTE) transmits data on the Transmitted Data
(TXD) line and receives data on the Received Data (RXD) line. Data Computer
Equipment (DCE) receives data on the TXD line and transmits data on the RXD
line. The LD emulates a DTE. If the other device connected to the meter also
emulates a DTE, the TXD and RXD lines must be interchanged for
communications to take place. This is known as a null modem connection. Most
printers emulate a DCE device while most computers emulate a DTE device.
Some devices cannot accept more than two or three characters in succession
without a pause in between. In these cases, the meter employs a busy function.
As the meter begins to transmit data, the RXD line (RS232) is monitored to
determine if the receiving device is “busy”. The receiving device asserts that it
is busy by setting the RXD line to a space condition (logic 0). The meter then
suspends transmission until the RXD line is released by the receiving device.
LD METER
+5V
Transmit
Enable
47K
RECEIVING DEVICE
1
2
3
5
4
47K
B (-)
A (+)
Terminal Block Connection Figure
3
COMM.*
RS485 Communications
The RS485 communication standard allows the connection of up to 32
devices on a single pair of wires, distances up to 4,000 ft. and data rates as high
as 10M baud (the LDA is limited to 38.4k baud). The same pair of wires is used
to both transmit and receive data. RS485 is therefore always half-duplex, that is,
data cannot be received and transmitted simultaneously.
* OPTIONAL
Terminal Block Connection Figure
4.0 r
evIeWIng
the
F
ront
B
uttons
and
d
Isplay
BUTTON DISPLAY MODE OPERATION
PAR
SEL
RST
Access Programming Mode
Index display through selected displays
Resets display
PROGRAMMING MODE OPERATION
Store selected parameter and index to next parameter
Advance through selection list/select digit position in
parameter value
Increment selected digit of parameter value
OPERATING MODE DISPLAY DESIGNATORS
MAX - Maximum display capture value
MIN - Minimum display capture value
“1” - To the left of the display indicates setpoint 1 output activated.
“2” - To the left of the display indicates setpoint 2 output activated.
Pressing the
SEL
button toggles the meter through the selected displays. If display scroll is enabled, the display will toggle automatically every four seconds
between the enabled display values.
5
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