ACI-Automation Components A/CS, A/CS-L, A/CSX, A/CSX-L Instruction Sheet
Installation and Operation Instructions
Middleton, WI
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Middleton, WI
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Middleton, WI
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Part # A/CS, A/CS-L, A/CSX, A/CSX-L
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
switches will not require external power, since the power for the current switch is induced from the conductor being monitored.
Warning: Never rely on the Red LED to determine whether power is present at the current switch. The Red LED will
indicate whether the current is above (LED On) or below (LED OFF) the fixed trip point.
The A/CS Series Current Switches should be used on Insulated Conductors Only! The current switch 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 switch and any other magnetic devices such
as contactors and transformers.
Please Read Instructions Carefully Before Installation!
Figure 1: Sensor Placed on Rail Figure 2: Sensor Removed From Rail
For applications in which the normal operating current is below the 0.5A trip point (See Figure 3 below), the conductor being
monitored may be looped through the sensor 4 times giving you a total operating current of 4X the original current.
Example: A small fan operating at 0.2A should be wrapped through the sensor 4 times to give you a total operating current of
0.8Amps flowing through the A/CS or another option is to use the A/CS-L.
Figure 3: Wires Through Sensors
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Version : 1.0
For applications in which the normal operating current is greater than 250 Amps or for conductor diameters larger than 0.750”
600:5 Ratio 5A C.T.
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:
Wire
Nut
Insulated
Conductor
Building Management
Digital Input #1
DI
(Status)
(Relay Coil or
DO
Contactor)
DDC Controller
Line
Transformer
Relay / Contactor
System
120 VAC
24 VAC Coil
24 VAC
ACI Model #
Fixed Trip Point
Output Switch Rating
Max. Sensing
Current Voltage
Max. Continuous
Current
Max. Current for
6 seconds
Max. Current for
1 second
A/CS
0.5 Amps
0.30Amps @ 200VAC/VDC
600 VAC
250 Amps
500 Amps
1,000 Amps
A/CS-L
0.2 Amps
0.30Amps @ 200VAC/VDC
600 VAC
250 Amps
500 Amps
1,000 Amps
A/CSX
1.0 Amps
0.15Amps @ 300VAC/VDC
600 VAC
250 Amps
500 Amps
1,000 Amps
A/CSX-L
0.5 Amps
0.15Amps @ 300VAC/VDC
600 VAC
250 Amps
500 Amps
1,000 Amps
(1.90 cm) in diameter, an external 5 Amp Current Transformer must be used as shown in Figure 4 below. Remember that the
secondary of the 5A CT must be shorted together before the power may be turned onto the monitored device.
Figure 4: Current Transformer
Wiring
ACI recommends the use of a 2 conductor 16 to 22 AWG shielded cable or twisted pair copper wire only for all current switch
applications. A maximum wire length of less than 30 meters (98.4 feet) should be used between the A/CS Series current switches
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. The current switch
output terminals represent a solid-state switch for controlling both AC and DC loads and is not polarity sensitive. 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 switch is 0.75” (1.90 cm) and will accept a maximum cable diameter of 350 MCM’s.
Operating Specifications
See Figure 5 and Figure 6 for two different current switch applications using your Building Management System (DDC/PLC
Controller). Figure 5 is showing the use of the Go/No Go Current Switch as a Digital Input to your DDC Controller, whereas
Figure 6 is showing you how to use the Go/No/Go Current Switch in conjunction with your building management system to
control a fan or pump for example.
Figure 5: Digital Circuit Figure 6: Analog Circuit
Version : 1.0
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