Red Lion LD2A05P0, LD4A05P0, LD2A, LD4A User guide
AIR PRESSURE STABILIZATION VENT
(57.15)
2.25
X
Z
Y
Tel +1 (717) 767-6511
C
US LISTED
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US LISTED
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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
U
R
C
L
US LISTED
IND. CONT. EQ.
51EB
U
R
C
L
US LISTED
LABORATORY EQUIPMENT
3RSD
UNIVERSALLY POWERED
Bulletin No. LDA-C
Drawing No. LP0673
Released 09/09
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.
SAFETY SUMMARY
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.
CAUTION: Risk of Danger.
Read complete instructions prior to
installation and operation of the unit.
CAUTION: Risk of electric shock.
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.
ORDERING INFORMATION
MODEL NO. DESCRIPTION PART NUMBER
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
(NOT included in LD Product UL File)
LD2A05P0
LD4A05P0
LDPLUG00
SPECIFICATIONS
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
200 mV 0.1% of span
20 V 0.1% of span
200 V
10 V
ACCURACY @
23
C LESS
THAN 85% RH
2 V 0.1% of span
0.1% of span
0.1% of span
INPUT
IMPEDANCE
1.027 M
1.027 M
1.027 M
1.027 M
538 K
D.C. Currents: 200 A, 2 mA, 20 mA, 200 mA
INPUT
RANGE
200 μΑ 0.1% of span
2 mA 0.1% of span
20 mA 0.1% of span
200 mA 0.1% of span
ACCURACY @
23
C LESS
THAN 85% RH
INPUT
IMPEDANCE
1.111 K
111
11
1
D.C. Process: 4 to 20 mA, 1 to 5 VDC, 0/1 to 10 VDC
INPUT RANGE SELECT RANGE
4 - 20 mA Use the 20 mA range
1 - 5 VDC Use the 10V range
1 - 10 VDC Use the 10V range
4. OVERRANGE/UNDERRANGE INDICATION:
Input Overrange Indication: “
OLOL”.
Input Underrange Indication: “ULUL”.
Display Overrange/Underrange Indication: “.....”/“-.....”
MAX
INPUT
RESOLUTION
SIGNAL
75 VDC 10 μV 70 ppm /°C
75 VDC 0.1 mV 70 ppm /°C
250 VDC 1 mV 70 ppm /°C
250 VDC
30 V
MAX
INPUT
SIGNAL
15 mA 10 nA 70 ppm /°C
50 mA 0.1 μA 70 ppm /°C
150 mA 1 μA 70 ppm /°C
500 mA 10 μA 70 ppm /°C
10 mV
1 mV
RESOLUTION
TEMP.
COEFFICIENT
70 ppm /°C
70 ppm /°C
TEMP.
COEFFICIENT
DIMENSIONS In inches (mm)
1
PART
NUMBER
Y (Height)X (Length)
4 (101.6)16 (406.4)LD2A05P0
7.875 (200)26 (660.4)LD4A05P0
Z (Center)
12 (304.3)
22 (558.8)
5. A/D CONVERTER: 16 bit resolution
MOUNTING HOLE (.281")
MUST BE
CONNECTED TO
TERMINAL #3 (TBA)
A/D Conversion Rate: 6 readings/sec.
6. DISPLAY RESPONSE TIME: 500 msec min.
7. USER INPUT:
Software selectable pull-up (8.6 K) or pull-down resistor
(3.9 K) that determines active high or active low input logic.
Trigger levels: V
Response Time: 5 msec typ.; 50 msec debounce (activation and release)
= 1.0 V max; VIH = 2.4 V min; V
IL
MAX
= 28 VDC
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 50 °C
Storage temperature: -40 to 70 °C
Operating and storage humidity: 0 to 85% max. RH (non-condensing)
Vibration According to IEC 68-2-6: Operational 5 to 150 Hz, in X, Y, Z
direction for 1.5 hours, 2 g’s (1 g relay).
Shock According to IEC 68-2-27: Operational 30 g’s (10 g relay), 11 msec
in 3 directions.
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
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. CERTIFICA TIONS AND COMPLIANCES:
SAFETY
UL Listed, File # E137808, UL508, CSA C22.2 No. 14-M95
File # E179259, UL61010A-1, 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.
Notes:
Immunity to Industrial Locations:
Criterion BEN 61000-4-2Electrostatic discharge
4 kV contact discharge
8 kV air discharge
Criterion BEN 61000-4-3Electromagnetic RF fields
10 V/m
Criterion BEN 61000-4-4Fast transients (burst)
2 kV power
1 kV signal
Criterion AEN 61000-4-5Surge
1 kV L-L,
2 kV L&N-E power
Criterion BEN 61000-4-6RF conducted interference
3 V/rms
Voltage dip/interruptions
Criterion AEN 61000-4-11
0.5 cycle
Emissions:
Class AEN 55011Emissions
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 INSTALLING THE METER
INSTALLATION
The meter meets NEMA 4X/IP65 requirements when properly installed.
INSTALLATION ENVIRONMENT
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.
2.0 SETTING THE JUMPERS
INPUT RANGE JUMPER
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.
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.
20 V/200 V
10 V
200 MV/2 V
2 MA
200 µA
20 MA
200 MA
RANGE SELECT
654231
TBC
2
3.0 WIRING THE METER
EMC INSTALLATION GUIDELINES
Although this meter is 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 the meter may be different for various
installations. The meter becomes more immune to EMI with fewer I/O
connections. Cable length, routing, and shield termination are very important
and can mean the difference between a successful or troublesome installation.
Listed below are some EMC guidelines for successful installation in an
industrial environment.
1. The meter should be properly connected to protective earth.
2. Use shielded (screened) cables for all Signal and Control inputs. The shield
(screen) pigtail 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 only at the panel where the unit is mounted to earth
ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is above 1 MHz.
c. Connect the shield to common of the meter and leave the other end of the
shield unconnected and insulated from earth ground.
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 ran in 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.
4. Signal or Control cables within an enclosure should be routed as far as
possible from contactors, control relays, transformers, and other noisy
components.
5. In extremely high EMI environments, the use of external EMI suppression
devices, such as ferrite suppression cores, is effective. Install them on Signal
and Control cables as close to the unit as possible. Loop the cable through the
core several times or use multiple cores on each cable for additional protection.
Install line filters on the power input cable to the unit to suppress power line
interference. Install them near the power entry point of the enclosure. The
following EMI suppression devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC# FCOR0000)
TDK # ZCAT3035-1330A
Steward # 28B2029-0A0
Line Filters for input power cables:
Schaffner # FN610-1/07 (RLC# LFIL0000)
Schaffner # FN670-1.8/07
Corcom # 1 VR3
Note: Reference manufacturer's instructions when installing a line filter.
6. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
7. Switching of inductive loads produces high EMI. Use of snubbers across
inductive loads suppresses EMI.
Snubber: RLC# SNUB0000.
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).
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.
TBA
321
Front
TBB
465132
Front
LD2
RANGE SELECT
TBC
TBD
LD4
321
465321
654231
53421
TBA
TBB
RANGE SELECT
TBC
TBD
31 2 4 56
Front
1 2345
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
+
-
L1
1
2
L2
TBA
3
RIGHT SIDE VIEW LEFT SIDE VIEW
DC Out Power
Terminal 4: + 24 VDC OUT
Terminal 6: User Common
3
+ EXC
4
USER COMM
6
TBC
3.2 USER INPUT WIRING
The User Input is located: LD2 - left side, LD4 - right side
Sinking Logic Sourcing Logic
Terminal 5: User Input
Terminal 6: User Comm
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).
N.C. 1
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
2
N.O. 1
COMM 1
3
N.C. 2
4
5
N.O. 2
COMM 2
6
TBB
TBC
+
5
-
USER
6
USER COMM
TBC
3.4 INPUT WIRING
Before connecting signal wires, the Input Range Jumper should be verified
for proper position.
TBC
VOLT INPUT
INPUT COMMON
CURRENT INPUT
+24 VDC EXC.
USER INPUT
USER/EXC. COMMON
1
2
3
4
20 V/200 V
10 V
200 MV/2 V
200 µA
2 MA
20 MA
200 MA
5
6
3.5 INPUT SIGNAL WIRING
Voltage Signal
(self powered)
Terminal 1: +VDC
Terminal 2: -VDC
Current Signal
(self powered)
Terminal 3: +ADC
Terminal 2: -ADC
Current Signal (2 wire
requiring excitation)
Terminal 4: +EXC
Terminal 3: +ADC
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.
Current Signal (3 wire
requiring excitation)
Terminal 3: +ADC (signal)
Terminal 2: -ADC (common)
Terminal 4: +EXC
VOLT
1 2
+
-
200 VDC MAX.
ANALOG COMM
2
200 MA DC MAX.
ANALOG COMM
CURRENT
3
Load
+
-
CURRENT
3
2 WIRE
TRANSMITTER
-
+ EXC.
4
+
out
ANALOG COMM
2
CURRENT
34
COMM
I
out
+ EXC.
Voltage Signal (3 wire
requiring excitation)
Terminal 1: +VDC (signal)
Terminal 2: -VDC (common)
Terminal 4: +EXC
4
VOLT
1
V
3 WIRE TRANSMITTER
3.6 SERIAL WIRING
TBD
A
COMM
RXD
TXD
4
2
3
1
B
5
232
485
5
LD METER RECEIVING DEVICE
+5V
4
47K
47K
3
B (-)
A (+)
COMM.*
Transmit
Enable
* OPTIONAL
1
TXD
RXD
COMM.
LD METER (DTE)
RECEIVING DEVICE
2
RXD
TXD
3
32
75
5
DTE
3
2
DB9
2
3
DTEDCE
DB25DB25
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.
Terminal Block Connection Figure
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.
RS232 Communications
RS232 is intended to allow two devices to communicate over distances up to
50 feet. Data T erminal Equipment (DTE) transmits data on the T ransmitted 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.
Terminal Block Connection Figure
4.0 REVIEWING THE FRONT BUTTONS AND DISPLAY
OPERATING MODE DISPLAY DESIGNATORS
MAX - Maximum display capture value
MIN
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.
BUTTON DISPLAY MODE OPERATION PROGRAMMING MODE OPERATION
PAR Access Programming Mode Store selected parameter and index to next parameter
SEL
RST
- Minimum display capture value
Index display through selected displays
Resets display
Advance through selection list/select digit position in
parameter value
Increment selected digit of parameter 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.
5
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