Dwyer MSCS User manual

Dwyer
Brand
Dwyer
Model
MSCS
Type
User manual

This manual is also suitable for

Model MSCS Miniature Current Switch
Specications - Installation and Operating Instructions
Bulletin PC-MSCS
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.
INSTALLATION
Mounting
1. Mount directly to a DIN rail in the electrical panel or enclosure.
or
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.
RoHS
Compliant
Sensed Current 60 A Max.
N.O. Status
1.0A @ 30VAC
42VDC
MSCS-220015
Digital Mini Current Switch
Consult Instruction Prior
to Installation
1-11/16
[42.80]
1-23/32
[43.69]
1-9/16
[39.37]
1-3/16
[30.16]
27/32
[21.08]
3/4
[19.30]
2XØ 3/16
[Ø4.57]
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.
NOTICE
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.
CAUTION
FAN OR PUMP
POWER
SOURCE
DI
DI
BUILDING AUTOMATION
CONTROLLER
POWER
SOURCE
HEATING ELEMENT
Figure 1
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
®
©Copyright 2018 Dwyer Instruments, Inc. FR# 444197-00 Rev. 1
INCREASING/DECREASING MEASURED CURRENT
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
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.)
Figure 2
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.
TROUBLESHOOTING
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.
Symptom Action
MSCS solid state output
does not function.
Verify the maximum amperage range has not been
exceeded. Voltages or currents above the rated
levels may damage the MSCS-220015.
Motor is turned on and
switch does not close.
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).
Failure to derate the current capacity could result in damage
to the MSCS-220015 when using multiple turns to increase
measured current. Use the following formula to determine the new maximum
current:
NOTICE
CURRENT > 60 A
Figure 3
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
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Dwyer MSCS User manual

Dwyer
Brand
Dwyer
Model
MSCS
Type
User manual
This manual is also suitable for
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