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SOLID STATE RELAYS
are used to produce reliable signal
and to avoid expensive relay replacement
Overview
 Founded 1975
 Pulse Transformer Solid state relays based on own
development since end of 70´s
 Own development and assembly in Nummela, near Helsinki
 Effective use of local sub-suppliers
 Sales through professional distributors
 Market leader in Finland and Sweden
 Exports to several European and North-American countries
 We (Weidmuller North America) are the exclusive Master
distributor for Delcon
Signal conditioning
FIELD 230/400 VAC
24...220 VDC
- inputs (limit switches)
- outputs (contactors)
CONTROL 24 VDC
- DCS
- PLC
- PC
4 kV
ALTERNATIVES
PLC I/O-cassette (relay, opto, transistor)
Electromechanical relay
Opto coupler
Delcon relay
SELECTION IS MADE BASED ON THE NEED OF:
UNIT RELIABILITY AND SIGNAL RELIABILITY
Electrical durability
Mechanical durability
Ability to transer signal correctly also in
disturbed environment
Typical problems with signal transfer
Malfunctions due to
- capacitive leakage
- transient and over-voltages
- Big frequency converters
Short life time due to
– high DC voltages
– inductive loads
– high switching frequency
Capacitive leakage
Problems:
Relays stay on…
Relays work on their own… LED is
glowing – relay is off...
Typical reasons:
Long signal cables (> 100 m)
Parallel signal & load cables
Transients and other disturbances
Problems:
Typical reasons:
PLC-card breaks…
Relays work on their own…
Malfunctions in system…
Switching on/off machines
Other outside disturbances
....frequency converters
Number of cycles and frequency and difficult loads
Problem:
Basic reason:
 too high switching frequency
> ones in a minute
Relays must be changed frequently…
Relays don´t work…
Slow function…

inductive AC or DC load from a coil

breaking > 30 VDC
Solution
Delcon supplies the industry with
Solid state relays and I/O-modules
• Solid state relay for demanding conditions
• Pulse Transformer (not OPTO!!!)
• Excellent immunity to interference
• Long lifetime > 15 years
• Switches also highly inductive loads
• Galvanic isolation 4000 V
• Made in Finland
Main products
 SL-series for DIN-rail mounting
- AC in- and output relays for static and motor loads
- DC in- and output relays for normal and inductive loads
 GL-series for direct mounting on PC.board with G4 dimensions
- AC in-and output relays for static loads
- DC in- and output relays for normal loads
 Mountig bases and sockets
- PCB-socket for SL-series
- DIN-rail socket for one relay
- DIN-rail mountigbase for several relays (8 & 16)
 Profibus and CANopen slave for Delcon relays
 PLC adapters and cables
Assembly
Parallel wiring
Control level
Signal level
Field level
Unshielded cables
24, 48, 110, 230 VAC or VDC
Parallel wiring
24 VDC
Assembly
Compact wiring
Control level
Signal level
Field level
Mounting base
+ 16 relays
PLC adapter + flat cable
24 VDC, 15 mA
25 … 50 m
Unshielded cable 24, 48, 110,
230 VAC tai VDC 0…10 A
Assembly
Distributed I/O
Control level
Signal level Field level
PB slave +
16/32 modules
CANopen
Basic applications, AC
SLI 230CR
SLO 24TR
SLI 230CRP
(25/49/120/380)
(5/12)
(120)
Input 230 VAC
Input 24 VDC
Input 230 VAC
Output 0 - 50 mA
Output 0 - 3A, 90A 20ms
Output 0 – 50 mA
Output voltage 0 – 60 VDC
Output voltage 0 - 240VAC
Output voltage 0 – 60 VDC
Difficult environment
Leakage < 0,05 mA
Long cables (< 500 m)
Cables several km long
Difficult environment
For 2-wire technology
Parallel load and signal
Frequency 5 Hz
High capasitive disturbanses
SLO ..IRA 1000Hz
Normal sensors
SLO 24 TRA for reverse
motorloads
CE and UL
CE and UL
Moderate capasitive
disturbanses
For 2-wire sensors
Max leakage current 3,5 mA
CE and UL
Basic products, DC
SLI 24CR
(12/48/125/250)
Input relay for long cables
and disturbed environment
Input 24 VDC
Output voltage 0 - 60 VDC
Output 50 mA
Switching 1000 Hz
SLI 24CRF10 000 Hz
CE and UL
SLO 24 CR
SLO 24CRX
SLO 24CRA
SLO 24CRA4
(5/12/48)
(5/12/48/120/220)
Output relay for normal
voltages and small
inductive loads, max. 5 ms
Output relay for high
voltages or/and highly
inductive loads
Input 24 VDC
Input 24 VDC
Output voltage 0 – 250
VDC
Induktive loads with max.
voltage and 24V DC load:
CRA = 1,8 A, 100 ms
CRA4 = 4,0 A, 50 ms
Output voltage 0…60 V
Output SLO 24CR 3 A
SLO 24CRX 10 A
Switching 1000 Hz
CE and UL
CE and UL
Customer choose Delcon because:
 Technical problems can not be solved with normal
relays or opto couplers
-
long signal cables
highly inductive load
high DC voltages
High transients
fast AC switching
high connecting frequency
 Normal relay solution is not reliable enough
- difficult environment and/or load
- large system need special reliability
- risk to non working contacts (oxidising)
 Delcon offers 100% safe signal transfer and status
indication!
Price (€)
Cost of Lost Production
Cost of 4 relays
+ 3 replacements
Cost of 3 relays
+ 2 replacements
C
O
S
T
Cost of 2 relays
+ 1 replacement
Lifetime Cost of Delcon Relay = Relay Price
Delcon
Other
relay
Cost of 1 relay
Lifetime Cost of Other Relay ≥ Relay Price
Time
Typical Customers
THE SWITCH
THE OPTIMAL INTERFACE RELAY IN DIFFICULT ENVIRONMENTS
Questions . . .