Installation and Operation Instructions
Part # A/CTA-5, A/CTA-50, A/CTA-250,
A/CTA-5-VFD, A/CTA-50-VFD, A/CTA-250-VFD
2305 Pleasant View Rd.
Middleton Industrial Park
Middleton, WI 53562
PH: (608) 831-2585
FAX (608) 831-7407
File Name: I0000139 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, 4 to 20 mA Loop Powered device that requires a reg12 to 30VDC external power source.
The A/CTA 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 ¾” 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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Figure 1: Sensor Placed on Rail Figure 2: Sensor Removed From Rail
For applications in which the normal operating current is greater than 250 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 3
below.
Remember that the secondary of the 5A CT must be shorted together before the power may be turned on from the device.
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:
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Figure 3: Current Transformer
!
