Dwyer SCS - Manual

Bulletin PC-1-SCS
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
Specifications - Installation and Operating Instructions
Series SCS Current Switches
The Series SCS Low Cost Current Switches are ideal for monitoring
whether fans, pumps, or motors are operating. The current flowing through
the core of the device powers the circuit without an external power supply.
All models have a built in solid state output and are easy to install. Optional
LED’s and 10 Amp relay modules are available. The Series SCS is available
in both Split and Solid Core configurations.
The Series SCS Current Switches are 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 SCS.
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.
SPECIFICATIONS
Output: Isolated, normally open.
External Relay: SPST N.O., 10A at 260 VAC (5A at 30 VDC).
Power Requirements: None, self-powered.
Temperature Limits: 5 to 140°F (-15 to 60°C).
Isolation Voltage: 600 VAC RMS.
Frequency: 50/60 Hz.
Enclosure rating: UL, V-O flammability rated, ABS plastic housing (solid
core) or Type 66 Nylon (split core).
Agency Approval: UL, CE.
NOTICE
INSTALLATION
MOUNTING
1.
2.
3.
WIRING (See figures 1 through 4 for examples of wiring)
1.
2a.
2b.
3.
4.
Detach the plastic mounting bracket from the current switch housing.
Using the two included screws, attach the mounting bracket to the
rear of the electrical panel or enclosure.
Re-attach the current switch housing to the plastic mounting bracket.
Disconnect the power to the conductor cable from the power source.
For solid core devices, slide the power conductor cable through the
sensing hole of the current switch.
For split core devices, 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.
Wire the Series SCS output terminals to the control box Digital Input
(DI) terminal (30 V max. terminal voltage). For snap-on relay models,
see figures 3 and 4 for wiring information.
Reconnect the power conductor cable.
POWER
SOURCE
BUILDING AUTOMATION
CONTROLLER
FAN OR
PUMP
POWER SOURCE HEATING ELEMENT
DI
DI
FIGURE 1
CONTACTOR
CONTROLLER
DI
MOTOR
FAN OR PUMP
FIGURE 2
CONTROL POWER
CONTACTOR
CONTROLLER
DI
DO
RELAY COIL
24 V AC/DC
POWER
FAN OR PUMP
FIGURE 3
1-27/32
[47.0]
2-35/64
[64.5]
63/64
[24.9]
1-5/64
[27.4]
MODELS
SCS-111100 AND SCS-120025
1-9/16
[39.6]
1-5/64
[27.4]
2-35/64
[64.5]
2-9/16
[65.0]
MODELS
SCS-111100-R
2-45/64
[68.6]
2-9/16
[65.0]
2-45/64
[68.6]
2-9/16
[65.0]
1-1/16
[26.9]
1-1/16
[26.9]
MODELS
SCS-220150-R AND SCS-211125-R
MODELS
SCS-220015, SCS-220150, AND SCS-211125
PC-1-SCS:TEMPLATE 12/4/08 2:15 PM Page 1