Dwyer L10 - Manual (Page 2)

©Copyright 2011 Dwyer Instruments, Inc. Printed in U.S.A. 11/11 FR# 82-440851-00 Rev. 2
CIRCUIT INFORMATION FOR REED SWITCH PROTECTION
READ INFORMATION BELOW BEFORE INSTALLING YOUR NEW REED SWITCH CONTROL!
Exceeding the current capacity of this Reed Switch control may cause FAULTY OPERATION! Be aware of the inductive and capacitive or lamp loads you may be placing on
you Reed Switch Control. The circuits below outline possible solutions to preventing overloads due to inrush or surge currents exceeding maximum or when the switch current
and product of the lamps (low “cold” resistance) is outlined below. Failure to follow these measures to protect Reed Switch Contacts may cause the contacts to weld together
or result in premature wear.
Possible Circuit Solutions Indicated by Dashed Lines
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Inductive Loads
Possible causes –
An electromagnetic relay, electromagnetic solenoid,
electromagnetic counter with inductive component as
circuit load.
Capacitive Loads
Possible causes –
A capacitor connected in series or parallel with Reed
Switch control. In a closed circuit, a cable length (usually
greater than 50m [162.5 ft.]) used to connect reed switch
may also introduce static capacitance.
Lamp Loads
Possible causes –
A tungsten filament lamp load.
DIODE SUPPRESSION
DIODE
INDUCTIVE
LOAD
PIV DIODE > V REED
SWITCH
REED
SWITCH
USED IN
AC CIRCUITS
VARISTER
VARISTER PROTECTION
INDUCTIVE
LOAD
RC SUPPRESSION
R
C
INDUCTIVE PROTECTION FOR
CABLE LENGTH CAPACITANCE
LOAD
REED
SWITCH
Cable Length
over 50 meters
[162.5 ft.]
REED
SWITCH
RESISTOR PROTECTION
FOR CAPACITIVE LOAD
SURGE LIMITER FOR
CAPACITANCE IN SERIES
REED
SWITCH
CURRENT LIMITING RESISTOR
IN SERIES
CURRENT LIMITING RESISTOR
IN PARALLEL
REED
SWITCH
REED
SWITCH
INDUCTIVE
LOAD
REED
SWITCH
SWITCH [uf]
10
C
R
10*I (1+50/E)
SWITCH
2
C
LOAD
SWITCH
SWITCH
LOAD
C
R
L =0.5~5 mH
P
+V
R
A
P
L
R
A
+V
R = 50~500 Ohms
R
B
P
L
L = 0.5~5 mH
P
+V R
L
R
R V-0.12 R
L
2
+V R
L
5R > R
L
R
MAINTENANCE/REPAIR
Upon final installation of the Series L10, no routine maintenance is required. The
Series L10 is not field 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 Sales” 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.