Red Lion GMSG1 User Manual

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MODEL GMSG1 – GRAPHITE SERIES STRAIN GAGE MODULE

 STRAIN GAGE MODULE FOR THE GRAPHITE SERIES

 PID CONTROL WITH REDUCED OVERSHOOT

 LOAD CELL, PRESSURE AND TORQUE BRIDGE INPUTS

 SELECTABLE LOW LEVEL INPUTS (20 mV, 33 mV or 200 mV

FULL SCALE)

 SOFTWARE SELECTABLE 5 VDC or 10 VDC BRIDGE

EXCITATION

 DIGITAL TARE (re-zero), BATCH TOTALIZER, AND PEAK/VALLEY

(max/min) RECORDING

 ON DEMAND AUTO-TUNING OF PID SETTINGS

 DC ANALOG OUTPUT

 WINDOWS® CONFIGURATION SOFTWARE

Bulletin No. GMSG1-A

Drawing No. LP0952

Effective 02/14

GENERAL DESCRIPTION

The Model GMSG is a full featured single loop PID controller designed for
use with the Graphite Series. The module accepts low level signals from a
variety of bridge-type transducers, such as load cells, pressure transducers,
torque transducers, etc. An optional second signal input is available, providing
math capabilities between the two input channels (average, differential, etc.).
Each input channel provides a software selectable 5 V or 10 V stable bridge
excitation voltage, capable of driving up to four 350 Ω bridges (combined total
per module). The inputs are selectable for ±20 mV, ±33 mV, or ±200 mV full
scale. With solid state or relay outputs, plus an analog output, the GMSG
module can perform virtually any combination of time-proportioning or linear
control. The discrete outputs may also be assigned to one of seven internal soft
alarms; and the linear output can be assigned to transmit virtually any internal
variable. In addition, digital tare (re-zero), batch totalizer, and peak/valley (max/
min) are provided.

The modules connect and communicate via proprietary USB connection to
the various Graphite host devices. Those devices, equipped with serial ports as
well as Ethernet port(s), allows the system to share data with PCs, PLCs, and
SCADA systems.

Caution should be used when adding modules to Graphite. Some modules,
depending on usage, may consume high levels of power. This may limit the total
number of modules that can be installed on a single Graphite host. Check the
Graphite module and Graphite host data sheets for specific usage and power
requirements.

The GMSG modules are available with relays, or open drain MOSFET
outputs. For applications requiring large loads to be controlled, several DIN rail
mount relays are available.

The modules can operate in On/Off, P, PI, or PID control mode, and use an
on-demand Auto-Tune that establishes the tuning constants. The PID constants
may be fine-tuned through the serial or Ethernet interface. The modules employ
a unique overshoot suppression feature, which allows the quickest response
without excessive overshoot. The modules can also be operated in manual mode,
providing the operator with direct control of the output.

CONFIGURATION

The Graphite Series is configured with Windows® compatible Crimson®
software. The software is an easy to use, graphical interface which provides a
means of configuration and commissioning of new systems, as well as routine
module re-calibration.

SAFETY SUMMARY

All safety related regulations, local codes and instructions that appear in the
manual 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.

Do not use the controller to directly command motors, valves, or other
actuators not equipped with safeguards. To do so can be potentially harmful to
persons or equipment in the event of a fault to the controller.

CAUTION: Risk of Danger.

Read complete instructions prior to

installationand operation of the unit.

CAUTION: Risk of electric shock.

DIMENSIONS In inches (mm)

2.97 (76)

1.25 (32)

4.65

(118)

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SPECIFICATIONS

1. POWER: Power will be supplied by the Graphite host device. Some
modules, depending on usage may consume high levels of power. This may
limit the total number of modules that can be installed on a single Graphite
host. Check the Graphite module and Graphite host data sheets for specific
usage and power requirements.
GMSG1 Max Power: 5.6 W

2. LEDs*:
STS - Status LED shows module condition.
OP1, OP2, OP3 - Indicate status of outputs 1, 2, and 3
ALM - Alarm LED is lit during any internal alarm condition.
* Default configuration.

3. MEMORY: Non-volatile memory retains all programmable parameters.

4. INPUTS:

SELECTABLE

INPUT RANGE

±20.000 mVDC

±33.000 mVDC

±200.00 mVDC

ACCURACY *

18 TO 28°C

10 TO 75% RH

0.02% of reading
+3 µV

0.02% of reading
+5 µV

0.02% of reading

+30 µV

* After 20 minute warm-up. Accuracy includes the temperature coefficient.
Connection Type:

4-wire bridge (differential)

2-wire (single-ended)
Sample Time: 50 msec (20 readings per second)
Common Mode Range (with respect to input common): 0 to +5 VDC
Common Mode Rejection: > 100 dB, DC to 120 Hz
Temperature Coefficient (ratio metric): 20 ppm/°C max.
Step Response Time: 200 msec max. to within 99% of final process value
Input Impedance: 100 MΩ
Max Continuous Overload: 30 V
PV Range: -30,000 to 30,000
Effective Resolution: 16-bit

5. BRIDGE EXCITATIONS:
Software selectable:

5 VDC, ±2%, 65 mA max.

10 VDC, ±2%, 125 mA max. combined (excitation 1 plus excitation 2).
Temperature coefficient (ratio metric): 20 ppm/°C max.
Max. four 350Ω bridges per module.

6. ISOLATION LEVEL: 500 Vrms @ 50/60 Hz for 1 minute between the
following:
OP1 * OP2 * OP3 *
Linear Output
Signal Inputs (the 2 input channels are not isolated from each other)
Power Supply Input
* Outputs OP1, OP2 and OP3 of SSR model are not isolated from each other

7. COMMUNICATIONS: Provided by the Graphite host device.

8. DISCRETE OUTPUTS:
Available as (3) Solid State NFET, or (3) Form A relay.
Solid State Output:

Type: Switched DC, N Channel open drain MOSFET
Current Rating: 1 A max
VDS ON: 0.3 V @ 1 A
VDS MAX: 30 VDC
Offstate Leakage Current: 0.5 mA max

Form A Relay Output:

Type: N.O.
Current Rating: 3 Amps @ 125 VAC
1/10 HP @ 125 VAC
Life Expectancy: 200,000 cycles at maximum load rating. (Decreasing

load, increasing cycle time, and use of surge suppression such as RC
snubbers increases life expectancy.)

9. CONTROL MODES:
Control: On/Off, P, PI, or PID
Output: Time proportioning or linear
Cycle Time: Programmable from 0.0 to 60.0 sec
Auto-Tune: When selected, sets proportional band, integral time, derivative

time values, and output dampening time

Input Fault Response: Upscale

ACCURACY *

0 TO 50°C

0 TO 85% RH

0.07% of reading
+4 µV

0.07% of reading
+7 µV

0.07% of reading

+40 µV

ACCURACY *

-40 TO 70°C

0 TO 85% RH

0.09% of reading
+5 µV

0.09% of reading
+9 µV

0.09% of reading

+50 µV

10. ALARMS:
Modes: Manual

Absolute High Acting Absolute Low Acting
Deviation High Acting Deviation Low Acting

Inside Band Acting Outside Band Acting
Reset Action: Programmable; automatic or latched
Standby Mode: Programmable; enable or disable
Hysteresis: Programmable
Input Fault Response: Upscale

11. ANALOG DC OUTPUT:
Software programmable for 0-10 VDC, 0-20 mA, or 4-20 mA
Resolution:

Voltage: 500 µV
Current: 1 µA

Accuracy:

0.1% of full scale (18 to 28°C)

0.2% of full scale (-40 to 70°C)
Update Time: 0.0 to 60.0 sec
Compliance (for current output only): 500 Ω max.
Minimum load (voltage output only): 10 KΩ min.
Output is software selectable for either 10 V or 20 mA. The output range may

be field calibrated to yield approximate 10% overrange and a small
underrange (negative) signal.

12. ENVIRONMENTAL CONDITIONS:
Operating Temperature Range: -40 to +70°C
Storage Temperature Range: -40 to +85°C
Operating and Storage Humidity: 85% max relative humidity, non-condensing,

from 0 to +50°C

Altitude: Up to 2000 meters

13. CERTIFICATIONS AND COMPLIANCES:

CE Approved

EN 61326-1 to Industrial Locations
IEC/EN 61010-1
RoHS Compliant

14. CONSTRUCTION: Case body is all metal construction. For indoor use
only. Installation Category II, Pollution Degree 2.

15. CONNECTIONS: Removable wire clamp screw terminal blocks.
Wire Gage: 28-16 AWG terminal gage wire
Torque: 6.0 lbf-inch (96 oz-inch)

16. MOUNTING: Screws to host.

17. WEIGHT: 8 oz (224 g)

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BLOCK DIAGRAM

VDC

RELAY

D

LINEAR

OUTPUT

ISOLATED

OP1-RELAY

OP2-RELAY

OP3-RELAY

ISOLATED

0-10V

0-20mA

F

PORT 1

PROGRAMMING

A

PORT 2

COMMUNICATIONS

A

+

-

POWER
SUPPLY

A

ISOLATED

PORT 3

ETHERNET

B

GRAPHITE HOST

+EXC

+SIG

-SIG

COM

+EXC

+SIG

-SIG

COM

SSR

OUTPUTS

ISOLATED

INPUT1

OUTPUTS

INPUT2

C

POWER

SUPPLY

ISOLATED

OP1-SSR1
OP2-SSR2
OP3-SSR3

E

GMSG1 - STRAIN GAGE MODULE

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.

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