FlowLine LI5X User manual

10500 Humbolt Street • Los Alamitos, CA 90720 USA
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www.flowline.com
Process & Temperature Meter
LI5X
Instruction Manual
• Accepts Current, Voltage, TC, & RTD Inputs
• 4 Digit Display, 0.56" (14 mm) High, Red LEDs
• Linear or Square Root with Low-Flow Cutoff
• Maximum/Minimum Display
• UL Type 4X, NEMA 4X, IP65 Front
• Universal Power Supply 85-265 VAC
• 12-36 VDC/12-24 VAC Power Option
• Two Relays or 4-20 mA Output Option
• 24 VDC Transmitter Power Supply Options
• Serial Communication Adapters
RS-232 & RS-422/485 Options
• Modbus®RTU Option
• Copy Meter Settings to Other Meters
• MeterView®Software - Configuration & Data Acquisition
Sunlight
Readable
Display!
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LI5X Process & Temperature Meter Instruction Manual
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LI5X Process & Temperature Meter Instruction Manual
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INTRODUCTION
The LI5X is a multipurpose, easy to use digital panel meter. It accepts
current, voltage, thermocouple, and RTD signals. The four front panel
buttons make the setup and programming an easy task.
The isolated 24 VDC transmitter power (optional) can be used to power
the input transmitter, the 4-20 mA output, or other devices.
The two relays (optional) can be used for alarm indication or process con-
trol applications, such as pump alternation control.
The 4-20 mA isolated output and the Modbus RTU serial communication
options make the LI5X an excellent addition to any system.
ORDERING INFORMATION
Model Options
LI50-1001 24 VDC Transmitter Power Supply
LI50-1001-MB 24 VDC Transmitter Power Supply, Modbus
LI51-1001 2 Relays, 24 VDC Transmitter Power Supply
LI51-1001-MB 2 Relays, 24 VDC Transmitter Power Supply, Modbus
LI52-1001 4-20 mA Output, 24 VDC Transmitter Power Supply
LI52-1001-MB 4-20 mA Output, 24 VDC Transmitter Power Supply, Modbus
Accessories
Model Description
LM91-1001 Low cost NEMA 4X Enclosure for LI5X Meter
LI97-1001-232 RS-232 Serial Adapter
LI97-1001-S01 MeterView®Software for 1 Meter
LI97-1001-S02 MeterView®Software for up to 10 Meters
LI97-1001-S03 MeterView®Software for up to 100 Meters
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LI5X Process & Temperature Meter Instruction Manual
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Table of Contents
INTRODUCTION ------------------------------------------------------------ 3
ORDERING INFORMATION --------------------------------------------- 3
SPECIFICATIONS---------------------------------------------------------- 7
General-------------------------------------------------------------------------------7
Process Input ----------------------------------------------------------------------8
Temperature Inputs -------------------------------------------------------------- 9
Relays Option-------------------------------------------------------------------- 10
Isolated 4-20 mA Transmitter Output ------------------------------------ 11
Serial Communications------------------------------------------------------- 11
COMPLIANCE INFORMATION ----------------------------------------12
Safety ------------------------------------------------------------------------------- 12
Electromagnetic Compatibility--------------------------------------------- 12
SAFETY INFORMATION ------------------------------------------------13
INSTALLATION ------------------------------------------------------------14
Unpacking------------------------------------------------------------------------- 14
Panel Mounting------------------------------------------------------------------ 14
Connections---------------------------------------------------------------------- 15
Connector Labeling ---------------------------------------------------------- 15
Power Connections ---------------------------------------------------------- 15
Signal Connections ---------------------------------------------------------- 16
Serial Communication ------------------------------------------------------- 19
Relays and 24 V Output Connections ----------------------------------- 19
Switching Inductive Loads-------------------------------------------------- 20
4-20 mA Output & Input Signal Connections -------------------------- 21
SETUP AND PROGRAMMING ----------------------------------------22
Front Panel Buttons and Status LED Indicators --------------------- 23
Display Functions and Messages----------------------------------------- 24
Main Menu ------------------------------------------------------------------------ 27
Setting Numeric Values ------------------------------------------------------ 28
Setting Up the Meter (setu) ------------------------------------------------- 29
Setting the Input Signal (inpt) -------------------------------------------- 30
Setting the Decimal Point (dc.pt) ----------------------------------------- 31
Setting the Temperature Scale (F C) ---------------------------------- 31
Setting the Relay Operation (rely) -------------------------------------- 32
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LI5X Process & Temperature Meter Instruction Manual
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Relay and Alarm Operation ------------------------------------------------ 35
Scaling the 4-20 mA Analog Output (Aout) ---------------------------- 41
Program the Sensor Break Output Value (SEbr) --------------------- 42
Analog Output when Display is Out of Range------------------------- 42
Programming the Meter (prog)--------------------------------------------- 43
Scaling the Meter (scal)---------------------------------------------------- 44
Calibrating the Meter (Cal)------------------------------------------------- 46
Recalibrating Temperature Inputs (Cal) -------------------------------- 46
Recalibrating Process Inputs (ICal)------------------------------------- 47
Setting Up the Password (pass) ------------------------------------------- 48
Locking the Meter ------------------------------------------------------------ 48
Unlocking the Meter---------------------------------------------------------- 48
Advanced Features Menu---------------------------------------------------- 50
Advanced Features Menu & Display Messages ---------------------- 51
Offset Adjustment (Adj)----------------------------------------------------- 53
Noise Filter (fltr)------------------------------------------------------------ 53
Noise Filter Bypass (byps) ------------------------------------------------- 54
Serial Communications (serl) -------------------------------------------- 54
Select Menu (SElc) ---------------------------------------------------------- 55
Linear or Square Root Function (linr or Sqrt) ---------------------- 55
Low-Flow Cutoff (cutF) ----------------------------------------------------- 56
Display Intensity (inty) ----------------------------------------------------- 56
Meter Copy Function (Copy) ----------------------------------------------- 57
Internal Calibration (ICal)-------------------------------------------------- 59
OPERATION ----------------------------------------------------------------62
Front Panel Buttons Operation -------------------------------------------- 62
Maximum/Minimum Readings---------------------------------------------- 63
MOUNTING DIMENSIONS ----------------------------------------------64
TROUBLESHOOTING----------------------------------------------------65
Diagnostics Menu (diag)----------------------------------------------------- 65
Determining Software Version -------------------------------------------- 65
Reset Meter to Factory Defaults ------------------------------------------- 66
Factory Defaults & User Settings----------------------------------------- 67
Troubleshooting Tips --------------------------------------------------------- 69
QUICK USER INTERFACE REFERENCE GUIDE----------------70
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LI5X Process & Temperature Meter Instruction Manual
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Table of Figures
Figure 1. Panel Cutout and Mounting............................................... 14
Figure 2. Connector Labeling for Two Relays & 24 V Supply......... 15
Figure 3. Power Connections ............................................................ 15
Figure 4. Transmitter Powered by Ext. Supply or Self-Powered .... 16
Figure 5. Transmitters Powered by Internal Supply (Optional) ...... 16
Figure 6. Voltage Input Connections ................................................ 17
Figure 7. Thermocouple Input Connections ....................................17
Figure 8. Three-Wire RTD Input Connections .................................. 18
Figure 9. Two-Wire RTD Input Connections..................................... 18
Figure 10. Four-Wire RTD Input Connections.................................. 19
Figure 11. Relay & 24 V Output Connections................................... 19
Figure 12. AC and DC Loads Protection........................................... 20
Figure 13. Low Voltage DC Loads Protection .................................. 20
Figure 14. 4-20 mA Output & Input Signal Powered by Meter ........ 21
Figure 15. 4-20 mA Output Powered Externally............................... 21
Figure 16. Meter Copy Connection ................................................... 57
Figure 17. Meter Dimensions – Side View ........................................ 64
Figure 18. Case Dimensions - Top View........................................... 64
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LI5X Process & Temperature Meter Instruction Manual
7
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
DISPLAY 0.56" (14 mm) high, red LED
Four digits (-1999 to 9999), automatic lead zero blanking.
DISPLAY INTENSITY Eight intensity levels
DISPLAY
UPDATE RATE
Process/RTD: 3.7-5/second
Thermocouple: 1.8-2.5/second
OVERRANGE Display flashes 9999
UNDERRANGE Display flashes -1999
PROGRAMMING
METHODS
Four front panel buttons, PC and MeterView®software, or
cloning using Copy function
NOISE FILTER Programmable from 2 to 199 (0 will disable filter)
RECALIBRATION All ranges are calibrated at the factory. Recalibration is
recommended at least every 12 months.
MAX/MIN
DISPLAY
Max/min readings reached by the process are stored until
reset by the user or until power to the meter is turned off.
PASSWORD Programmable password restricts modification of
programmed settings.
NON-VOLATILE
MEMORY
All programmed settings are stored in non-volatile memory
for a minimum of ten years if power is lost.
POWER AC: 85-265 VAC, 50/60 Hz, 20 VA
DC: 90-265 VDC, 20 Watts
FUSE Required fuse: UL Recognized, 5 A max, slow blow
Up to 6 meters may share one 5 A fuse
ISOLATED
TRANSMITTER
POWER SUPPLY
24 VDC ±10% @ 200 mA max. (-1 option)
NORMAL MODE
REJECTION
64 dB at 50/60 Hz
ISOLATION 4 kV input/output-to-power line
500 V input-to-output, output-to-P1
OVERVOLTAGE
CATEGORY
Installation Overvoltage Category II:
Local level with smaller transient overvoltages than Instal-
lation Overvoltage Category III.
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LI5X Process & Temperature Meter Instruction Manual
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ENVIRONMENTAL Operating temperature range: 0 to +65°C
Storage temperature range: -40 to +85°C
Relative humidity: 0 to 90% non-condensing
CONNECTIONS Removable screw terminal blocks accept 12 to 26 AWG
wire, RJ11 for serial communication adapters
ENCLOSURE 1/8 DIN, high impact plastic,
UL 94V-0, color: gray
MOUNTING 1/8 DIN panel cutout required. Two panel mounting
bracket assemblies provided
TIGHTENING
TORQUE
Screw terminal connectors: 4.5 lb-in (0.5 Nm)
OVERALL
DIMENSIONS
2.45" x 4.68" x 4.19" (62 mm x 119 mm x 106 mm)
(H x W x D)
WEIGHT 8.0 oz (227 g) (no options)
9.7 oz (275 g) (2 relays & 24 V transmitter supply options)
WARRANTY 2 years parts and labor
Process Input
INPUTS Field selectable:
±20 mADC (0-20, 4-20 mA) and ±10 VDC (0-5, 1-5, 0-10 V)
ACCURACY ±0.05% of span ±1 count, square root: 10-100% F.S.
LOW-FLOW
CUTOFF
0-9999 (0 disables cutoff function)
TEMPERATURE
DRIFT
50 PPM/°C from 0 to 65°C ambient
DECIMAL POINT Up to three decimal places for process inputs:
d.ddd, dd.dd, ddd.d,or dddd
CALIBRATION
RANGE
An Error message will appear if input 1 signal and input 2
signals are too close together.
Input
Range
Minimum Span
Input 1 & Input 2
4-20 mA 0.40 mA
±10 V 0.20 V
INPUT
IMPEDANCE
Voltage ranges: greater than 1 MΩ
Current ranges: 50 - 100 Ω(depending on resettable fuse impedance)
INPUT
OVERLOAD
Current input protected by resettable fuse.
Fuse resets automatically after fault is removed.
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LI5X Process & Temperature Meter Instruction Manual
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Temperature Inputs
INPUTS Field selectable: type J, K, T, or E thermocouples;
100 Ωplatinum RTD (0.00385 or 0.00392 curve)
RESOLUTION 1°for all thermocouples and RTD inputs
1°or 0.1°for Type T thermocouple
ACCURACY
Input Type Range Accuracy
Type J -58°to 1382°F
-50°to 750°C
±2°F
±1°C
Type K -58°to 2300°F
-50°to 1260°C
±2°F
±1°C
Type T -292°to 700°F
-180°to 371°C
±2°F
±1°C
Type T
0.1°Res
-199.9°to 700.0°F
-180.0°to 371.0°C
±1.8°F
±1.0°C
Type E -58°to 1578°F
-50°to 870°C
±2°F
±1°C
100 ΩRTD -328°to 1382°F
-200°to 750°C
±1°F
±1°C
COLD
JUNCTION
REFERENCE
Automatic, fixed, no user calibration needed
TEMPERATURE
DRIFT
±2°C maximum
0 to 65°C ambient temperature
OFFSET
ADJUSTMENT
Programmable to ±19.9°. This parameter allows the user to
apply an offset value to the temperature being displayed.
INPUT
IMPEDANCE
Greater than 100 kΩ
SENSOR BREAK
DETECTION
Open TC or RTD sensor indicated by display flashing oPEn.
All relays and alarm status LEDs go to alarm state.
Analog output goes to the programmed sensor break value.
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LI5X Process & Temperature Meter Instruction Manual
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Relays Option
RATING 2 SPDT (form C); rated 3 amps @ 30 VDC or 3 amps @
250 VAC resistive load; 1/14 HP @ 125/250 VAC for
inductive loads
ELECTRICAL
NOISE
SUPPRESSION
A suppressor (snubber) should be connected to each relay
contact switching inductive loads, to prevent
disruption to the microprocessor’s operation.
Recommended suppressor value: 0.01 µF/470 Ω, 250 VAC
DEADBAND 0-100% of full scale, user selectable
HIGH OR LOW
ALARM
User may program any alarm for high or low trip point.
RELAY
OPERATION
Automatic (non-latching)
Latching
Pump alternation control
RELAY RESET User selectable via front panel buttons or PC
Automatic reset only (non-latching)
Automatic + manual reset at any time (non-latching)
Manual reset only, at any time (latching)
Manual reset only after alarm condition has cleared (latching)
Automatic reset: Relays will automatically reset when the
input passes the reset point.
Manual reset: Front panel ACK button. Pressing ACK re-
sets all manually resettable relays.
TIME DELAY 0 to 199 seconds, on and off delays
Programmable and independent for each relay
FAIL-SAFE
OPERATION
Programmable
Independent for each relay
AUTO
INITIALIZATION
When power is applied to the meter, relays will reflect the
state of the input to the meter.
Fail-safe operation: relay coil is energized in non-alarm condition. In
case of power failure, relay will go to alarm state.
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LI5X Process & Temperature Meter Instruction Manual
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Isolated 4-20 mA Transmitter Output
OUTPUT RANGE 1.00 to 23.00 mA typical
CALIBRATION Factory calibrated for 4-20 mA
SCALING RANGE 0.00 to 23.99 mA for any display range,
see output range above
ACCURACY ± 0.1% F.S. ± 0.004 mA
TEMPERATURE
DRIFT
50 PPM/°C from 0 to 65°C ambient
Note: Analog output drift is separate from input drift.
ISOLATED
TRANSMITTER
POWER SUPPLY
24 VDC ±10% @ 200 mA max. (-1 option)
EXTERNAL LOOP
POWER SUPPLY
35 VDC maximum
OUTPUT LOOP
RESISTANCE Power supply Minimum Maximum
24 VDC 10 Ω700 Ω
35 VDC (external) 100 Ω1200 Ω
Serial Communications
METER
ADDRESS
Standard Proprietary Data Comm (PDC) protocol: 0 – 99
Optional Modbus protocol: 1 - 247
BAUD RATE 300 – 19,200 bps
TRANSMIT
TIME DELAY
Programmable between 0 and 199 ms
or transmitter always on for RS-422 communication
DATA 8 bit (1 start bit, 1 stop bit)
PARITY None, even, or odd
(Modbus only; PDC protocol does not use parity)
BYTE-TO-BYTE
TIMEOUT
0.01 – 2.54 sec (Modbus only)
TURN AROUND
DELAY
Less than 2 ms (fixed)
Refer to Standard and Modbus Communication Protocol manuals for details.
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LI5X Process & Temperature Meter Instruction Manual
12
COMPLIANCE INFORMATION
Safety
UL LISTED USA and Canada
UL 508 Industrial Control Equipment
UL FILE NUMBER E193723
FRONT PANEL UL Type 4X, NEMA 4X, IP65; panel gasket provided
LOW VOLTAGE
DIRECTIVE
EN 61010-1:2001 (UL 61010C-1)
Safety requirements for measurement, control, and
laboratory use
Electromagnetic Compatibility
EMISSIONS EN 55011:1998
Group 1 Class A ISM emissions requirements
Radiated
Emissions
Class A
AC Mains
Conducted
Emissions
Class A
IMMUNITY EN 61000-6-2:2001
EMC heavy industrial generic immunity standard
RFI - Amplitude
Modulated
80 -1000 MHz 10 V/m 80% AM (1 kHz)
Electrical Fast
Transients
±2kV AC mains, ±1kV other
Electrostatic
Discharge
±4kV contact, ±8kV air
RFI - Conducted 10V, 0.15-80 MHz, 1kHz 80% AM
AC Surge ±2kV Common, ±1kV Differential
Surge 1KV (CM)
Power-Frequency
Magnetic Field
3 A/m 70%V for 0.5 period
Voltage Dips 40%V for 5 & 50 periods
Voltage
Interruptions
<5%V for 250 periods
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LI5X Process & Temperature Meter Instruction Manual
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Note:
Testing was conducted on LI5X Meters installed through the covers
of grounded metal enclosures with cable shields grounded at the
point of entry representing installations designed to optimize EMC
performance.
Declaration of Conformity available.
SAFETY INFORMATION
!
CAUTION: Read complete
instructions prior to instal-
lation and operation of the
meter.
WARNING: Risk of
electric shock.
WARNING
Hazardous voltages exist within enclosure. Installation and service
should be performed only by trained service personnel.
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LI5X Process & Temperature Meter Instruction Manual
14
INSTALLATION
There is no need to remove the meter from its case to com-
plete the installation, wiring, and setup of the meter.
Unpacking
Remove the meter from box. Inspect the packaging and con-
tents for damage. Report damages, if any, to the carrier.
If any part is missing or the meter malfunctions, please contact
your supplier or the factory for assistance.
Panel Mounting
• Prepare a standard 1/8 DIN panel cutout – 3.622" x 1.772" (92 mm
x 45 mm). Refer to Mounting Dimensions, page 64 for more details.
• Clearance: allow at least 4" (102 mm) behind the panel for wiring.
• Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).
Recommended minimum panel thickness to maintain Type 4X
rating: 0.06" (1.5 mm) steel panel, 0.16" (4.1 mm) plastic panel.
• Remove the two mounting brackets provided with the meter (back-off
the two screws so that there is ¼" (6.4 mm) or less through the
bracket. Slide the bracket toward the front of the case and remove).
• Insert meter into the panel cutout.
• Install mounting brackets and tighten the screws against the panel.
To achieve a proper seal, tighten the mounting bracket screws
evenly until meter is snug to the panel along its short side. DO NOT
OVER TIGHTEN, as the rear of the panel may be damaged.
Panel
Gasket
Mounting
Bracket
Mounting
Screw
Removable
Connectors
3.622" (92mm)
1.772"
(45mm) Panel Cutout
to DIN 43700
Square Corners to 0.060"
(1.5mm) Max Radius
A
B
Tolerances:
A: +0.032 (+0.8mm)
-0.000 (-0.0mm)
B: +0.024 (+0.6mm)
-0.000 (-0.0mm)
Figure 1. Panel Cutout and Mounting
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LI5X Process & Temperature Meter Instruction Manual
15
Connections
All connections are made to removable screw terminal connectors
located at the rear of the meter.
!
Use copper wire with 60°C or 60/75°C insulation for all
line voltage connections. Observe all safety regulations.
Electrical wiring should be performed in accordance with
all applicable national, state, and local codes to prevent
damage to the meter and ensure personnel safety.
Connector Labeling
The connectors label, affixed to the meter, shows the location of all
connectors available with requested configuration. It also identifies the
location of the RTD/TC selector switch.
24V OUT
EL1601
PO WER
EXC T+V+ mA+ COM
RTD
SW I TC H
TC
TC
RTD
12 3 456
COM NONO NC NC COM
RELA Y2 RELA Y1
4365 21
3412 5
2121
P+ P-
+-
Figure 2. Connector Labeling for Two Relays & 24 V Supply
Power Connections
Power connections are made to a two-terminal connector labeled
POWER on Figure 2. The meter will operate regardless of DC polarity
connection. The + and - symbols are only a suggested wiring convention.
12
AC or DC
POWER
Required External Fuse:
5 A max, Slow Blow
POWER CONNECTOR
+-
Figure 3. Power Connections
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LI5X Process & Temperature Meter Instruction Manual
16
Signal Connections
Signal connections are made to a five-terminal connector labeled
SIGNAL on Figure 2. The COM (common) terminal is the return for all
types of input signals.
Current and Voltage Connections
The following figures show examples for current and voltage connections.
There are no switches or jumpers to set up for current and voltage inputs.
Setup and programming is performed through the front panel buttons.
COMmA+
21 354
V+ T+
EXC
External
Power
Supply
2-Wire
4-20 mA
Transmitter
-+ +-
SIGNAL CONNECTOR
COM
SIGNAL CONNECTOR
mA+
21 354
V+ T+
EXC
2-Wire 4-20 mA
Self-Powered
Transmitter
-+
Figure 4. Transmitter Powered by Ext. Supply or Self-Powered
COM
SIGNAL CONNECTOR
mA+
21 354
V+ T+
EXC
2-Wire
4-20 mA
Transmitter
-+
P+ P-
21
24V OUT
COM
SIGNAL CONNECTOR
mA+
21 354
V+ T+
EXC
3-Wire
4-20 mA
Transmitter
Signal
+
21
24V OUT
-
P+ P-
Figure 5. Transmitters Powered by Internal Supply (Optional)
The current input is protected against current overload by a resettable
fuse. The display may or may not show a fault condition depending on
the nature of the overload.
The fuse limits the current to a safe level when it detects a fault condi-
tion, and automatically resets itself when the fault condition is removed.
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LI5X Process & Temperature Meter Instruction Manual
17
SIGNAL CONNECTOR
21 354
Voltage
Signal
+-
COMmA+
V+ T+
EXC COM
SIGNAL CONNECTOR
mA+
21 354
V+ T+
EXC
3-Wire
Voltage
Transducer
Signal +
21
24V OUT
-
P+ P-
Figure 6. Voltage Input Connections
The meter is capable of accepting any voltage from -10 VDC to +10 VDC.
Thermocouple and RTD Connections
The following figures show examples for thermocouple and RTD con-
nections.
The RTD/TC selector switch must be set to the proper position for the
meter to accept the selected temperature input.
The input type is selected using the Setup menu.
Selected thermocouple input must correspond to thermocouple sensor
and wire type used.
SIGNAL CONNECTOR
21 354
-
+
TC
RTD TC
12 3 456
COMmA+
V+ T+
EXC
Switch
Position
Figure 7. Thermocouple Input Connections
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LI5X Process & Temperature Meter Instruction Manual
18
SIGNAL
CONNECTOR
21 354
RTD TC
12 3 456
COMmA+
V+ T+
EXC
Switch
Position
RTD
Sensor
Figure 8. Three-Wire RTD Input Connections
The meter accepts two, three, or four-wire RTDs. The three-wire RTD
connection has built-in lead wire compensation.
SIGNAL
CONNECTOR
21 354
RTD TC
12 3 456
COMmA+
V+ T+
EXC
Switch
Position
RTD
Sensor
Figure 9. Two-Wire RTD Input Connections
Lead wire compensation for two-wire RTDs can be applied using the
Adjust menu. See Offset Adjustment (Adj), page 53.
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LI5X Process & Temperature Meter Instruction Manual
19
SIGNAL CONNECTOR
21 354
RTD TC
12 3 456
COMmA+
V+ T+
EXC
Switch
Position
RTD
Sensor
NC
Figure 10. Four-Wire RTD Input Connections
The four-wire RTD connection is similar to the three-wire. One of the
leads of a four-wire RTD is not connected, and may be clipped off.
The three-wire connection provides sufficient lead wire compensation to
provide accurate readings even with long leads.
Serial Communication
Serial communication connection is made to an RJ11 connector labeled
SERIAL on Figure 2. Use LI97-1001-232 for RS-232 interfacing.
Use a standard modular cable for meter-to-meter interfacing for cloning
purposes (i.e. copying programmed settings from one meter to other
meters).
Relays and 24 V Output Connections
Relay connections are made to a six-terminal connector labeled
RELAY1, RELAY2 on Figure 2. The COM (common) terminals of the
relays should not be confused with the COM (common) terminal of the
SIGNAL connector. The 24 VDC output is available at the connector
labeled 24V OUT, next to the relays connector.
24V OU
T
P+ P-
COM NONO NC NC COM
RELAY2 RELAY1
4365 21 21
Figure 11. Relay & 24 V Output Connections
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LI5X Process & Temperature Meter Instruction Manual
20
Switching Inductive Loads
The use of suppressors (snubbers) is strongly recommended when switching
inductive loads to prevent disrupting the microprocessor’s operation. The sup-
pressors also prolong the life of the relay contacts. Suppression can be obtained
with resistor-capacitor (RC) networks assembled by the user or purchased as
complete assemblies. Refer to the following circuits for RC network assembly
and installation:
Figure 12. AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1 Ωfor each volt across the contacts
C: 0.5 to 1 µF for each amp through closed contacts
Notes:
1. Use capacitors rated for 250 VAC.
2. RC networks may affect load release time of solenoid loads. Check to con-
firm proper operation.
3. Install the RC network at the meter's relay screw terminals. An RC network
may also be installed across the load. Experiment for best results.
Figure 13. Low Voltage DC Loads Protection
Use a diode with a reverse
breakdown voltage two to
three times the circuit volt-
age and forward current at
least as large as the load
current.
Spec Tech Industrial Electric
www.spectechind.com
888-773-2832
Spec Tech Industrial Electric
www.spectechind.com
888-773-2832