2010-10-11  CELDUC

A new option for current monitoring applications

The ESU current monitoring module can be mounted on the SU/SUL versions of the celpac® 2G series of solid-state contactors to continuously measure load current. This makes it possible to monitor up to 5 parallel connected loads.

The measured current is continuously compared to a reference value that is stored in the module. This value (“Iteach”) can be saved using the Teach button, or by feeding an external Teach signal to the module.

By holding the Teach button for at least 3 seconds, or applying the Teach signal for at least 3 seconds, the module will store the measured current (at that moment) as Iteach. The module is designed with internal current thresholds of ±16% for detecting an overcurrent or undercurrent condition. In addition, the module monitors the entire circuit for a fault condition (no current flows with control functioning) and does the same for the relay (current flows but control not functioning). If a fault is detected, the alarm output activates within a maximum delay of 100ms. The different configurations, and the alarm output, are indicated by 3 LEDs.

Potential faults/failures that the module is able to detect:
-Load circuit interruption
-Mains supply interruption (tripped circuit breaker)
-Partial load failure
-Solid state relay failure

What are some good reasons for using these current monitoring modules?
-Rapid fault detection (immediate alarm indication)
-Facilitation of maintenance
-Quick and easy identification of a partial load failure
-Enhanced quality of manufactured products (by supporting processes where temperature must be very precisely regulated and the failure of a heater would lead to a significant loss of quality)
-No available space in the switch cabinet, as the modules can simply be mounted on the solid state contactors.

Additional options (on inquiry):
It is possible to integrate micro switches for parameterizing the current monitoring modules (current threshold values, delay times, interlocking, etc.). Please inquire with CODICO for more details.

The celpac series is a cost-effective and reliable solution with a compact form factor! Increasingly, satisfying the goal of economizing switching solutions means finding products that are easier and faster to install in switching cabinets, while ideally saving space at the same time. Our lineup of new-generation celpac series solid state contactors is the answer!

Performance & reliability:
-Maximum voltage up to 1600V (690VRMS), 600VAC and 1200VAC standard
-Thyristor current ratings up to 95A (IRMS = 96A @ 100°C ; IRMS = 125A @ 85°C
-Wide input voltage range: 3-32VDC with current limiting
-AC input control available
-Input status indication with yellow LED
-Overvoltage protection on input
-New generation of TMS² technology in thyristors, for longer life expectancy
-Quick and easy to connect
-Designed according to the European standards EN60947-4-3 (IEC947-
4-3) and EN60950 (VDE0805 reinforced insulation), UL/cUL
-IP20 protection with removable cover flaps (SU series) or cover (SA series)
-Other optional protective circuits: RC, VDR, active overvoltage protection
-Fixing dimensions identical with SO or SC relays, in a “Hockey Puck” design

Cost-effective installation and maintenance:
-The 22.5mm width of these solid state contactors reduces the space needed for mounting to a minimum
-Less installation time thanks to easy cabling
-Reduced maintenance thanks to very long life expectancy
-Same screw driver can be used for input and output screws

A variety of versions are available:
-SA series: with screw connections and a transparent cover, for mounting on heat sinks or on a mounting panel
-SAL series: ready for connection on heat sinks with a width of 22.5mm or 45mm
-SU series: with a plug connector for the control and removable protective flaps, for mounting on heat sinks or on a mounting panel
-SUL and SUM series: ready for connection on heat sinks with a width of 22.5mm or 45mm

Another new product is the SO3 series of fast burst control SSRs for pulse group operation (µP based). This control mode is particularly suited for ohmic loads having a low thermal inertia, e.g., short-wave infrared emitters, as it permits tight regulation and reduces emitted interference (low flicker EMC). A microcontroller calculates the number of full sine waves to be switched (proportional to the input voltage) and distributes them in balanced fashion over a fixed modulation period. In contrast to pulse packet control, this mode of operation does not experience extended turn-on or turn-off times and is thus able to prevent flicker.

Please inquire with CODICO to find out which product is ideal for your application. Also, keep in mind that custom solutions are available to meet your specific requirements!


2 current thresholds: 0,84*lteach & 1,16*lteach (+/- 16%)
Current range: 2A-40A/Ansteuerung: 8VDC-32VDC
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