aci A/SCTA Series Installation instructions

Installation and Operation Instructions
Part # A/SCTA-5, A/SCTA-50, A/SCTA-200,
A/SCTA-5-VFD, A/SCTA-50-VFD, A/SCTA-200-VFD
2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: [phone] FAX [phone]
File Name: I0000140 Rev 7 Doc.
Page 1 of 3
ACI
Automation Components, Inc.
Please Read Instructions Carefully Before Installation!
Safety
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.
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.

Installation
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
current sensor is a 2-wire Loop Powered device that requires a regulated +12 to 30VDC external power source.
The A/SCTA Series Analog Current Sensors should be used on Insulated Conductors Only! The current sensors may be
mounted in any position using the (2) #8 x 3/4” Tek screws and the mounting holes in the base or snapped directly on to the 35mm
DIN rail (See Figures 1 & 2 below). Leave a minimum distance of 1” (3 cm) between the current sensor and any other magnetic
devices such as contactors and transformers.
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A/SCTA-5
Middleton,WI
A/SCTA-5
ACI
AutomationComponents,Inc.
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Figure 1: Sensor Placed on Rail Figure 2: Sensor Removed from Rail
Latch Operation:
Pressing down on the two (2) side tabs and swinging the cover open opens the split core current sensor as shown in Figure 3
below. Lifting up on the latch with a flat-tip screwdriver as shown in Figure 4 below can also open the unit. Press down firmly on
the cover to close the current sensor. 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. Silicone grease, present on the cores to
prevent rust, can capture grit and dirt if care is not exercised. 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.
ACI A/SCTA-5
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IND.CONT.EQ.
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AutomationC omponents, Inc.
Middleton,WI
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Figure 3: Opening Sensor by Hand Figure 4: Opening w/ Screwdriver
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2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: [phone] FAX [phone]
File Name: I0000140 Rev 7 Doc
Page 2 of 3
For applications in which the normal operating current is greater than 200 Amps or for conductor diameters larger than 0.750”
(1.90 cm) in diameter, an external 5 Amp Current Transformer must be used in conjunction with an A/CTA-5 or A/CTA-5-VFD
as shown in Figure 5 below.
Remember that the secondary of the 5A CT must be shorted together before the power may be turned on from the device.
Example: For currents up to 600 Amps
(and not below 70 Amps, where
Current Transformer (C.T.)
secondary falls down to 1 Amp)
use a 600:5 ratio C.T. as shown:
600:5 Ratio 5A C.T. Nut
Wire
InsulatedConductor
Figure 5: Current Transformer
Wiring
ACI recommends the use of a 2 conductor 16 to 22 AWG shielded cable, copper wire only for all current sensor installations. A
maximum wire length of less than 30 meters (98.4 feet) should be used between the A/SCTA Series current sensors and the
Building Management System or controller. 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 so as to prevent any chance of shorting. The current sensors terminals
are polarity sensitive and represent a linear and proportional 4 to 20mA output signal. The current sensors are available in either an
Average or True RMS output version. The recommended torque to be used on the terminal block connections is 0.67 Nm or 5.93
in-lbs. The aperture (hole) size of the current sensor is 0.75” (1.90 cm) and will accept a maximum cable diameter of 350 MCM’s.

Operating Specifications
*Note: All current sensors are shipped from the factory with the jumper set in the high range.
** Note: All -VFD models have True RMS outputs and should be used with Variable Frequency Drives
Wiring Example
+
Supply
Power
+12 to 30 VDC
DC
_
_
+
Building Automation
GND (Shield)
Signal Input
4 to 20 mA
Common
System
+
ACI Model # Range Jumper * Max. Sensing
Current Voltage
Max. Continuous
Current
Max. Current for
6 seconds
CE Compliant
A/SCTA-5 0-5 Amps None 600 VAC 100 Amps 125 Amps Yes
A/SCTA-50 0-10 Amps
0-20 Amps
0-50 Amps
Low
Middle
High
600 VAC 100 Amps
150 Amps
200 Amps
125 Amps
225 Amps
300 Amps
Yes
A/SCTA-200 0-100 Amps
0-150 Amps
0-200 Amps
Low
Middle
High
600 VAC 135 Amps
180 Amps
250 Amps
200 Amps
300 Amps
400 Amps
Yes
A/SCTA-5-VFD ** 0-5 Amps None 600 VAC 60 Amps 100 Amps No
A/SCTA-50-VFD ** 0-10 Amps
0-20 Amps
0-50 Amps
Low
Middle
High
600 VAC 60 Amps
100 Amps
160 Amps
80 Amps
200 Amps
300 Amps
No
A/SCTA-200-VFD ** 0-100 Amps
0-150 Amps
0-200 Amps
Low
Middle
High
600 VAC 135 Amps
180 Amps
250 Amps
200 Amps
300 Amps
400 Amps
No

2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: [phone] FAX [phone]
File Name: I0000140 Rev 7 Doc
Page 3 of 3
Troubleshooting
Problem Solution
No reading - Confirm that you have +12 to 30VDC in series with the current sensor output
terminals and the analog input of the control panel.
- Check the polarity of the circuit.
- Verify that the terminals are screwed down, wires are firmly in place.
- Disconnect the input to the control panel and then insert a current meter
(mAmp range) in series with the current sensor output to verify that the circuit is
working properly.
Erratic readings - Verify that the wires are terminated properly.
- Check that the +12 to 30VDC input is clean. 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 Conversion Formulas
To convert the current sensor output signal to a current reading.
4-20mA output to Current reading (4mA = 0 Amps and 20mA = 200 Amps for A/SCTA-200)
Example: 12mA current sensor output signal
Total Span = 200 Amps
Multiplier = 20mA-4mA/200 (Total Span) = 0.08
(12mA-4mA) / 0.08= 100 Amps
WEEE 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.
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