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 3 of 3
See
Figure 7
and
Figure 8
for two different current switch applications using your Building Management System (DDC/PLC
Controller).
Figure 7
is showing the use of the Adjustable Current Switch as a Digital Input to your DDC Controller, whereas
Figure 8
is showing you how to use the Adjustable Current Switch in conjunction with your building management system to
monitor belt loss on a motor.
(Status)
System
Digital Input #1
Building Management
24 VAC
120 VAC
Line
Transformer
(Relay Coil or
Contactor)
DO
DI
DDC Controller
24 VAC Coil
Relay / Contactor
Figure 7: Digital Circuit Figure 8: Analog Circuit
Calibration of Adjustable Trip Point
The adjustable current switch has an operating range of 0 to 200 or 0 to 250 Amps depending on the model being entered (see
Figure #9).
Do not exceed!
The adjustable current switch comes with its fifteen-turn adjustment potentiometer set counter
clockwise to the maximum 200 or 250A trip point position. The adjustable current switch can monitor Under load, Normal Load,
and Overload conditions, depending on how it’s set. The procedure below is for the Normal load condition for part numbers
A/ASCS & A/ASCS-L.
Normal Loads
With power on, and the adjustable current switch on the proper range, turn the 15-turn adjustment potentiometer clockwise until the
Red LED turns on and stop immediately. The adjustable current switch is now tripped. The adjustable current switch Hysteresis
(Dead Band) is 10% of the trip point typically.
Troubleshooting
Problem
Solution
Red LED is on but the current switch didn’t activate
Disconnect the wires from the current switch output. Measure the
resistance across the contacts with an Ohmmeter.
See Figure 9
for
resistance readings for a good unit.
Red LED didn’t turn on and the current switch didn’t
activate
Verify that the conductor you are monitoring is above the adjustable
trip point. If the sensor is monitoring less than the adjustable trip
point
See Figure 5
on Page 2.
Current Switch doesn't switch at all, regardless of current
level.
Adjustment potentiometer is probably set to its maximum or
minimum position. Turn the Pot counter-clockwise all the way and
verify if the LED switches from Red to Green.
ACI Model #
Resistance if switch open
Resistance if switch closed
A/ASCS
Greater than 1 Meg ohms
Approximately 2 ohms
A/ASCS-L
Greater than 1 Meg ohms
Approximately 2 ohms
A/ASCSX
Greater than 1 Meg ohms
Approximately 12 ohms
A/ASCSX-L
Greater than 1 Meg ohms
Approximately 12 ohms
Figure 9
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.
LISTED
C
US
IND.CONT.EQ.
3JHX