Greystone Energy Systems GT-ASM Series Bedienungsanleitung
Page 1
INTRODUCTION
The analog scaling module is used for analog signal conversion
or re-scaling. It will accept one DC voltage, current or resistive
input signal and output a non-isolated voltage or current
signal. The output signal is easily calibrated for various osets
and spans can be direct or reverse acting to provide signal
inversion.
The device also includes a regulated power output that can
be used to power a transducer or a resistance input. It features
top-adjust trim-pots for oset, gain, input attenuation and
reverse-oset calibration. There is also an LED power indicator.
The product comes with standard snap-track for easy mounting or is also available mounted in a hinged
ABS enclosure
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the device. Failure to follow these
instructions may result in product damage. Do not use in an explosive or hazardous environment, with
combustible or ammable gases, as a safety or emergency stop device or in any other application where
failure of the product could result in personal injury. Take electrostatic discharge precautions during
installation and do not exceed the device ratings.
MOUNTING
The snap-track device may be mounted in any position. Use only ngers to remove the PCB from the
snap-track, do not pry on the PCB with tools. Do not ex the PCB during removal or installation. Slide the
PCB out of the snap-track. See Figure 1. Ensure any metallic mounting hardware does not contact the
underside of the PCB.
Avoid mounting in areas where the device is exposed to vibrations
or rapid temperature changes. Mount the snap track with the PCB
removed using two screws as shown in Figure 2.
Once the snap track is mounted, place one side of the PCB into the
snap track and gently press the other side of the PCB with two ngers
evenly placed at each corner until the PCB snaps into place, see Figure
3.
If the enclosure is present it is to be mounted on a vertical surface
using the four integrated mounting holes that facilitate a #10 screw
(not supplied) as shown in Figure 4.
Open the enclosure by pulling on the latch on the right side of the
enclosure, at the same time pull on the cover as illustrated in Figure 4.
Make wire connections as per the "Wiring" instructions on page 2.
Swing the door closed until latched. For added security, two screws
are provided that may be installed in the integrated screw tabs. See
Figure 5.
Figure 1
Figure 3 Figure 4 Figure 5
Figure 2
IN-GE-GTASMXXX-01 03/20 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: +1 506 853 3057 Web: www.greystoneenergy.com
Analog Scaling Module
GT-ASM Series - Installation Instructions
Page 2
WIRING
• Deactivate the 24 Vac/dc power supply until all connections are mate to the device to prevent electrical
shock or equipment damage. Follow proper electrostatic discharge handling procedures when
installing the device or equipment damage may occur.
• Use 22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit
with wiring used to supply inductive loads such as motors. Make all connections in accordance with
national and local codes.
• Connect the plus DC or the AC voltage hot side to the PWR terminal.The supply common is connected to
the COM terminal. The device is reverse voltage protected and will not operate if connected backward.
It has a half-wave power supply so the supply common is the same as the input signal common.
• Several devices may be connected to one power supply and the input signals all share the same
common.
• Ensure the supplied power is within the device ratings. Power supply voltages outside the ratings may
cause over-heating, device damage or unreliable operation.
• The analog input signal is connected to the IN terminal and the analog output signal is connected to
the OUT terminal. Both the input and output signals are referenced to the COM terminal.
• The 20V terminal is a regulated power supply output which provides a 20 Vdc power supply at 30 mA
maximum that can be used to operate an external sensor.
CALIBRATION AND SET-UP
The device is typically calibrated with a voltage type input signal to simplify the procedure. If the actual
input signal will be a current type, then convert the required current signal to voltage rst and apply the
voltage signal for this procedure.
Calibration Voltage = Input Current Signal (Amps) x 250
For example, if the input signal will be 4-20 mA, then use a 1-5 Vdc calibration voltage.
EQUIPMENT
The following equipment will be required to change the calibration of the device:
• 24 Vdc power supply
• Digital voltage/current meter
• Voltage input signal simulator
If a signal simulator is not available, use a 10-20K trim pot to generate the input voltage. Connect one end
of the pot to the 20V terminal, the other end to the COM terminal and the pot wiper to the IN terminal.
Then measure the IN voltage and set the pot to achieve the desired input voltage.
STEP 1
Set the trim pots to fully CCW
The 4 pots on the PCB are multi-turn pots of about 20 turns. They are all factory set to fully counter-
clockwise. If they have been adjusted previously, rotate them at least 20 turns counter-clockwise to their
initial positions.
Figure 6 Figure 7
0 - +
OFFSET
IN
OUT
VmA
PWR COM 20V IN OUT ATN GAN REV OFF
POWER
PCB Jumpers set up for
normal acting, no oset,
mA input and voltage output
0001256
REV NORM
PWR
COM
20V
IN
OUT
+
-
+
-
24 Vac/dc Power Supply
Loop Powered Sensor
PWR
COM
20V
IN
OUT
+
-
R1
R2
24 Vac/dc Power Supply
IN-GE-GTASMXXX-01 03/20 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: +1 506 853 3057 Web: www.greystoneenergy.com
Page 3
STEP 2
Set the PCB jumpers
Set the Normal/Reverse jumper to the NORM position. If a reverse acting signal is required, it will be set
later in the procedure.
Set the OFFSET jumper to the 0 position. If an oset is required, it will be set later in the procedure.
Set the IN jumper to the V position. If a current input signal is required, it will be set later in the procedure.
Set the OUT jumper to theV position. If a current output signal is required, it will be set later in the procedure.
STEP 3
Make the wiring connections
Ensure the power supply is turned o when making connections.
Connect 24 Vdc to the PWR terminal.
Connect the power supply common, the voltmeter common (-) and the input signal common to the COM
terminal.
Connect the + of the input voltage signal to the IN terminal.
Connect the + of the voltmeter to the OUT terminal.
STEP 4
Apply power
Turn on the 24 Vdc power supply and the POWER LED should light.
STEP 5
Input/Output signal calculation
Calculate the required INPUT voltage signal span.
Vin_span = Vin_max - Vin_min
Examples, 0-5 V input = 5 volt span, 3-12 V = 9 volt span
If the input is to be 4-20 mA, use the equivalent calibration voltage calculated previously, 4-20 mA = 1 - 5
V = 4 V span.
Calculate the required OUTPUT voltage signal span.
Vout span = Vout max - Vout min
Examine, 3-15 V output = 12 volt span
STEP 6
Apply the input voltage span result to the IN terminal. For example, if the calculated input span is 9 volts,
apply 9 volts to the IN terminal.
Compare the output meter reading to the output voltage span number calculated previously. If the meter
reads higher, then adjust the ATTN pot until the meter equals the output span value. If the meter equals
the output span value.
During this adjustment, the input signal should be as stable as possible and the output adjustment should
be as precise as possible to obtain the best results.
STEP 7
Oset adjustment
The oset adjustment shifts the output signal up or down. For example, a 1-5 volt output signal has a 1
volt of oset.
IN-GE-GTASMXXX-01 03/20 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: +1 506 853 3057 Web: www.greystoneenergy.com
Page 4
SPECIFICATIONS
POWER OUTPUT
Regulated Power Output............ 20 Vdc ± 10% @ 30 mA maximum (use to power an external sensor)
INPUT SIGNAL
Voltage Range ................................ 0 to 17.5 Vdc
Voltage Impedance ...................... >100 KΩ
Current Range................................. 0 to 30 mA
Current Impedance....................... 250 Ω
OUTPUT SIGNAL
Voltage Range ................................ 0 to 17.5 Vdc
Voltage Impedance ...................... 3K Ω @ 17.5 Vdc
Current Range................................. 0 to 30 mA
Current Impedance....................... 650 Ω at 20 mA
Accuracy ........................................... ±1%
GENERAL
Power Supply.................................. 23 to 28 Vdc, 22 to 26 Vac (half-wave rectied)
Consumption.................................. 100 mA maximum
Protection Circuitry....................... Reverse voltage protected, overvoltage protected
Operating Conditions .................. 0 to 50°C (32 to 122°F), 5 to 95 %RH non-condensing
Storage Conditions....................... -30 to 70°C (-22 to 158°F), 5 to 95 %RH non-condensing
Wiring Connections...................... Screw terminal block (14 to 2 2AWG)
Enclosure.......................................... Snap track mounting standard, 59.7mm L x 82.5mm W (2.35" x 3.25")
Country of Origin..............................Canada
Apply the minimum input voltage signal and note the output signal on the meter. If the output reading is
correct, leave the OFFSET jumper in the 0 position and continue to the next step.
If the output reading must be increased to the desired value, then move the OFFSET jumper to the +
position and adjust the OFF pot to obtain the correct minimum output on the meter.
If the output reading must be decreased to the desired value, then move the OFFSET jumper to the -
position and adjust the OFF pot to obtain the correct minimum output on the meter.
Remember that increasing or decreasing the oset value will also increase or decrease the maximum
output by the same amount.
STEP 8
Reverse action adjustment
If a reverse acting output signal is required (5-1 V for example), then move the REV/NORM jumper to the
REV position. If this is not required then proceed to the next step.
Apply the minimum voltage input signal and adjust the REV pot for the maximum required output signal.
STEP 9
Make nal jumper settings
If jumper settings are to be changed, rst disconnect the power and input/output connections.
If a current input signal is required, then move the IN jumper to the mA position.
If a current output signal is required, then move the OUT jumper to the mA position.
Check the operation of the device with the correct signal types for proper signal rescaling and operation.
IN-GE-GTASMXXX-01 03/20 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: +1 506 853 3057 Web: www.greystoneenergy.com
PRINTED IN CANADA
Page 5
DIMENSIONS
82.5mm
3.25"
59.7mm
2.35"
0 - +
OFFSET
IN
OUT
VmA
PWR COM 20V IN OUT ATN GAN REV OFF
POWER
PCB Jumpers set up for
normal acting, no oset,
mA input and voltage output
0001256
REV NORM
IN-GE-GTASMXXX-01 03/20 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: +1 506 853 3057 Web: www.greystoneenergy.com
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