Dwyer MSCS User guide

Download

Page 1

Model MSCS Miniature Current Switch

1-9/16

2XØ 3/16

Specications - Installation and Operating Instructions

[39.37]

1-3/16

[30.16]

27/32

[21.08]

[Ø4.57]

Compliant

RoHS

Sensed Current 60 A Max.

1.0A @ 30VAC N.O. Status

42VDC

3/4

[19.30]

Bulletin PC-MSCS

1-23/32

[43.69]

1-11/16

[42.80]

Digital Mini Current Switch

Consult Instruction Prior

to Installation

MSCS-220015

The Model MSCS Miniature Current Switch is a low cost solution for monitoring on and off status of light to medium current loads in compact spaces. This unit has a split

core design and has a xed set point of 0.15 amps. It is designed to detect changes in

operating current to prevent motor belt loss, slippage, or mechanical failure.

NOTICE

The Model MSCS-220015 Miniature Current Switch is intended

to provide an input to equipment under normal operating

conditions. Where failure or malfunction of the current switch could lead to personal

injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices such as supervisory or alarm systems or safety or limit controls intended to warn of, or protect against, failure or malfunction of the MSCS-220015.

CAUTION

Risk of Shock. Disconnect power supply before making electrical connections. Contact with components carrying hazardous

voltage can cause electrical shock and may result in severe personal injury or death.

INSTALLATION Mounting

1. Mount directly to a DIN rail in the electrical panel or enclosure.

2. Using the two included screws, attach the switch to the rear of the electrical panel or enclosure.

Wiring (See Figure 1 for an example of wiring)

1. Disconnect the power to the conductor cable from the power source.

2. Open the core using the release tab. Snap the core closed around the power

conductor cable. Make sure that the core release tab is locked in its original position.

3. Wire Model MSCS-220015 output terminals to the control box Digital Input (DI) terminal (30 VAC max. terminal voltage).

4. Reconnect the power conductor cable.

SPECIFICATIONS Amperage Range: 0.15 to 60 A. Output: NO. Power Requirements: None, self-powered. Temperature Limits: 5 to 140°F (-15 to 60°C). Humidity Limits: 0 to 95%, non-condensing. Isolation Voltage: 300 VAC RMS. Frequency: 50/60 Hz. Enclosure Rating: UL 94 V-0 ammability rated, ABS plastic housing. Agency Approvals: CE, cULus.

POWER

SOURCE

BUILDING AUTOMATION

CONTROLLER

DI DI

FAN OR PUMP

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

POWER

SOURCE

Phone: 219/879-8000

Fax: 219/872-9057

HEATING ELEMENT

Figure 1

www.dwyer-inst.com

e-mail: info@dwyermail.com

Page 2

INCREASING/DECREASING MEASURED CURRENT

CURRENT > 60 A

If the measured current is too low to be detected or is higher than the maximum current rating of the MSCS-220015, use the following methods to increase or decrease current.

If measured current is too low to be detected:

Wrap the conductor (wire) through the sensing hole and around the MSCS-220015 body to produce multiple turns to increase the measured current. (See Figure 2) Use the below equation to determine how many wraps are necessary.

Measured current = Actual current * Number of turns

NOTICE

measured current. Use the following formula to determine the new maximum

current:

New Maximum Current = MSCS-220015 Current Rating ÷ Number of turns (For example, Model MSCS-220015 with 4 turns = 60 A ÷ 4 = 15 A, new maximum current.)

Failure to derate the current capacity could result in damage to the MSCS-220015 when using multiple turns to increase

If measured current is above ratings of switch:

Use a 5 A current transformer (CT) to reduce the current passing through the MSCS-

220015. (See Figure 3) Run the current transformer secondary wire through the sensing hole. Terminate the two secondary wires of the 5A current transformer to each other, and then install the 5A current transformer on the monitored conductor.

Figure 3

Figure 2

TROUBLESHOOTING

Symptom Action

MSCS solid state output

does not function.

Motor is turned on and

switch does not close.

MAINTENANCE/REPAIR

Upon nal installation of the Model MSCS-220015 Miniature Current Switch, no routine maintenance is required. The Model MSCS is not eld serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem plus any

additional application notes.

Verify the maximum amperage range has not been exceeded. Voltages or currents above the rated levels may damage the MSCS-220015. Insufcient current to the load leads (for example, a motor or heater) to reach the set point threshold.

To turn the switch on , wrap the cable multiple times

through the sensing hold (See Figure 2).