2305 Pleasant View Rd.
Middleton Industrial Park
Middleton, WI 53562
PH: (608) 831-2585
FAX (608) 831-7407
File Name: I0000138 Rev 6.Doc
Page 2 of 3
For applications in which the normal operating current is below the 3.0A trip point
(See Figure 5 below
), the conductor being
monitored may be looped through the sensor 12 times giving you a total operating current of 12X the original current.
Example: A small fan operating at 0.2A should be wrapped through the sensor 18 times to give you a total operating current
Of 3.6Amps flowing through the A/ASCS or another option is to use the A/ASCS-L.
ACI
Automation Components, Inc.
A/ASCS
Middleton, WI
US
3JHX
LISTED
IND.CONT.EQ.
C
IND.CONT.EQ.
LISTED
3JHX
ACI
Middleton, WI
Automation Components, Inc.
A/ASCS
C
US
Figure 5: Wire Through Sensor
For applications in which the normal operating current is greater than 200 or250 Amps
(see operating specifications below)
or
for conductor diameters larger than 0.750” (1.90 cm) in diameter, an external 5 Amp Current Transformer must be used as shown
in
Figure 6 below
.
Remember that the secondary of the 5A CT must be shorted together before the power may be turned onto the monitored 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
Ins
ula
ted
Co
ndu
cto
r
Figure 6: 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.
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 switch output
terminals represent a solid-state switch for controlling 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
ACI Model #
Adjustable Trip Point
Output Switch Rating
Max. Sensing
Current Voltage
Max. Continuous
Current
Max. Current for
6 seconds
Max. Current for
1 second
A/ASCS
3.00 - 250 Amps
0.30Amps @ 200VAC/VDC
600 VAC
200 Amps
400 Amps
800 Amps
A/ASCS-L
2.00 - 250 Amps
0.30Amps @ 200VAC/VDC
600 VAC
200 Amps
400 Amps
800 Amps
A/ASCSX
3.00 - 250 Amps
0.15Amps @ 300VAC/VDC
600 VAC
250 Amps
500 Amps
1,000 Amps
A/ASCSX-L
2.50 - 250 Amps
0.15Amps @ 300VAC/VDC
600 VAC
250 Amps
500 Amps
1,000 Amps