Zot Supply MSCTA-40 Analog Output Current Sensor User Guide
- September 27, 2024
- Zot Supply
Table of Contents
Automation Components, Inc. a DwyerOmega brand
USER’S GUIDE
MSCTA-40 & MSCTE-40 Series
Analog Output Current Sensor
MSCTA-40 Analog Output Current Sensor
The information contained in this document is believed to be correct, but ACI accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.
Precautions
- This product is not intended to be used for Life or Safety applications.
- This product is not intended for use in any hazardous or classified locations.
- The MSCTA and MSCTE Series Current Sensors must be used on Insulated Conductors Only!
HIGH VOLTAGE
- Disconnect and lock out all power sources before installation as severe injury or death may result from electrical shock due to contact with high voltage wires.
General Information
The MSCTA and MSCTE Analog Current Sensors are designed for use in any AC current monitoring application in which you are looking to monitor a particular piece of equipment. Applications may include monitoring a resistive type load such as an incandescent light bulb, heating element as well as any single speed linear load.
The MSCTA-40 is a 2 wire 4-20mA loop current sensor which requires a +13.5 to
30VDC power supply. The MSCTE-40 has a 0-5VDC output, and does not require
external power, since the power for the current sensor is induced from the
conductor being monitored. The split-core current sensors work great in
retrofit applications and for use on service technicians vehicles since one or
two parts will work in most applications and can be easily installed without
disconnecting any wires.
The MSCTA/E series sensors can be secured to the monitored cable using a cable
tie and the integrated cable tie anchor feature of the housing. The sensors
also come with an attachable mounting foot that allows the unit to be mounted
in any position using one Tek screw or snapped directly on a 35mm DIN rail.
Installation Instructions
Make sure that all installations are in compliance with all national and local electrical codes. Only qualified individuals that are familiar with codes, standards, and proper safety procedures for high-voltage installations should attempt installation. The MSCTA-40 is a 2 wire 4-20mA loop current sensor which requires a +13.5 to 30 VDC power supply. The MSCTE-40 has a 0-5VDC output, and does not require external power, since the power for the current sensor is induced from the conductor being monitored. The MSCT sensor has multiple mounting options. The MSCT sensor enclosure has a plastic feature that allows for the monitored current wire to be cable tied to the enclosure for free hanging installation applications – See Figure 4 (pg. 6). This will be the preferred method for most installations.
Alternatively, the current sensor product comes with a detached mounting foot. With the mounting foot attached to the sensor main body, the enclosure may be mounted in any position using the one #8 x 3/4” Tek screw through the hole in the mounting foot. The mounting clip must be snapped into position- See Figure 3. Align the front of the MSCT Sensor (latch) with the front of the mounting clip (screw mount). Insert the MSCT Sensor unit at a slight angle, with the back of the unit leading down, and push down to snap into place. Additionally, the enclosure may be snapped directly on a 35mm DIN rail – See Figure 2. Leave a minimum distance of 1” (3 cm)between the current switch and any other magnetic devices such as contactors and transformers.
LATCH OPERATI ON
Press down on the side tab and swing the top of the unit up to open the split
core current switch. Press down firmly on the cover to close the current
switch. An audible “click” will be heard as the tab slides over the tongue on
the base.
CAUTION
Mating surfaces of the magnetic core are exposed when the sensor is open.
Operation can be impaired if anything prevents good contact between pole
pieces. Visually check the mating parts of the core before closing the current
sensor.
Wiring Instructions
ACI recommends the use of a two conductor 16 to 22 AWG shielded cable or
twisted pair copper wire only for all analog current sensor applications. All
wiring must comply with all local and National Electric Codes.
Note
When using a shielded cable, be sure to connect only (1) end of the shield to
ground at the controller. Connecting both ends of the shield to ground may
cause a ground loop.
When removing the shield from the sensor end, make sure to properly trim the
shield to prevent any chance of shorting.
The current sensor terminals are polarity sensitive and represent a linear 4
to 20 mA (MSCTA-40) or 0 to 5 VDC (MSCTE-40) output signal. See diagrams below
for proper wiring. Tighten the screws at the terminal block connections to the
recommended torque of 0.5 to 0.6 Nm (4.43 to 5.31 in-lbs.). The aperture
(hole) size of the current sensor is 0.20” (5.0 mm) x 0.49” (15.5 mm). It fits
10AWG to 14 AWG THHN Insulated Wire.
Troubleshooting
| Problem | Solutions |
|---|---|
| No Reading | · Verify that there is current flowing through the conductor being |
monitored with a clamp-on current probe.
· Check the polarity of the circuit.
· Verify that the terminals are screwed down, wires are firmly in place.
MSCTA-40
· Confirm that you have +13.5 to 30VDC in series with the current sensor
output terminals and the analog input of the control panel.
· Disconnect the input to the control panel and then insert a current meter
(mA range) in series with the current sensor output to verify that the circuit
is working properly.
MSCTE-40
· No power supply needed. The power for the current sensor is induced from the
conductor being monitored.
· Disconnect the wires from the current sensor output and tighten down the
screws. Measure the voltage across the current sensor output with a Voltmeter
to verify that the sensor is working properly.
Erratic Readings| · Verify that the wires are terminated properly.
· In areas of high RF interference, shielded cable may be necessary to
stabilize signal.
Inaccurate Readings| If you suspect that the current sensor is not reading
within the accuracy specifications, please contact the factory for assistance.
Current Sensor is operating at a low-level current or failing to operate
within the accuracy specifications:| · Visually check the mating parts of the
core to ensure there is no debris between the split contacts.
· Remove all debris or dust manually and close the current sensor.
· Continue to retest the sensor in your application.
Specifications
Monitored Current Type: AC Current
Maximum AC Voltage: 600 VAC
Isolation Voltage: 2200 VAC
Operating Frequency Range: 50/60 Hz
Core Style: Split-Core
Supply Voltage (MSCTA-40): +8.5 to 30 VDC (Reverse Polarity Protected)
250 Ohm Load (1-5 VDC): +13.5 to 30 VDC
500 Ohm Load (2-10 VDC): +18.5 to 30 VDC
Supply Current (MSCTA-40): 25 mA minimum
Supply Voltage (MSCTE-40): Induced from the Monitored Conductor
(Insulated Conductors only)
Maximum Load Resistance at 24 VDC (MSCTA-40): 775 Ohms
(Formula : [24 VDC – 8.5 VDC] / 0.020 A)
Sensor Amperage Range: 40 A
Output Signal: MSCTA-40: 4 to 20 mA (2-Wire, Loop Powered)
MSCTE-40: 0-5 VDC
Response Time: MSCTA-40: < 600 mS (Rise and Fall Times)
MSCTE-40: < 300 mS (Rise and Fall Times)
Aperture Size (Diameter) | Wire Size: 0.20” (5.0 mm) x 0.49” (12.5 mm)
Fits 10 AWG to 14 AWG THHN Insulated Wire
DIN Rail Size: 35 mm
Operating Temperature Range 1
: MSCTA: -22 to 140 ºF (-30 to 60 ºC
MSCTE: -22 to 122 ºF (-30 to 50 ºC)
Operating Humidity Range: 10 to 95 %, non-condensing
Storage Temperature | RH Range: -40 to 158 °F (-40 to 70 °C) | 10 % to 95 %
RH, non-condensing
Enclosure Material | Flammability Rating: PC/ABS (Polycarbonate/ABS Blend) |
UL94-V0
Wiring Connections: 2 Position Screw Terminal Block (Polarity Sensitive)
Wire Size: 16 to 22 AWG (1.31 mm 2 to 0.33 mm 2 ) Copper Wires Only
Terminal Block Torque Rating: 4.43 to 5.31 in-lbs. (0.5 to 0.6 Nm)
Minimum Mounting Distance: 1” (2.6 cm) between current switch & other magnetic
devices (Relays, Contactors, Transformers)
Agency Approvals: UL/CUL US Listed (UL 508) Ind. Control Equipment (File #
E309723), CE, RoHS, UKCA, FCC, CAN ICES-3 / NMB-3
Product Weight: 0.165 lbs. (0.075 Kg)
Product Dimensions (L x W x H): 1.93” (48.99 mm) x 1.31” (33.17 mm) x 2.18”
(55.37 mm)
Note 1 : Maximum 40 °C for 50 Hz operation of MSCTE
Specifications
| Accuracy| Current| Application Range Temperature| Frequency
---|---|---|---|---
MSCTA-40| ±0.75 % FS
(±0.3 A)| Greater
than 2 A| 5 to 140 °F
(-15 to 60 °C)| 60 Hz
±0.75 % FS
(±0.3 A)| Greater
than 2 A| 32 to 140 °F
(0 to 60 °C)| 50 Hz
MSCTE-40| ±0A % FS
(±0.16 A)| Full Range| 5 to 95 °F
(-15 to 35 °C)| 60 Hz
+0• 75 % FS – (±0.3 A)| Full Range| -22 to 1220F
(-30 to 50 C)| 60 Hz
±0.75 % FS
(±0.3 A)| Full Range| -22 to 86 °F
(-30 to 30 °C)| 50 Hz
WARRANTY
The ACI MSCTA and MSCTE Current Sensor Series are covered by ACI’s Five (5)
Year Limited Warranty, which is located in the front of ACI’S SENSORS &
TRANSMITTERS CATALOG or can be found on ACI’s website:
www.workaci.com.
W.E.E.E. DIRECTIVE
At the end of their useful life the packaging and product should be disposed
of via a suitable recycling centre. Do not dispose of with household waste. Do
not burn.
FCC Compliance Statement
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
workaci.com
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