G4BRICKBASE OPTO 22, G4BRICKBASE Datasheet - Page 21

• Manufacturer Part Number: G4BRICKBASE
• Description: Programmable Logic Controller
• Manufacturer: OPTO 22

Specifications of G4BRICKBASE

• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• For Use With: I/O Bricks
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

In applications requiring greater current rating at higher voltage,
two Opto 22 SSRs may be operated in series for double the
voltage rating. The built-in snubber in each SSR assures proper
voltage sharing of the two SSRs in series. In the diagram below,
two 240-volt, 45-amp SSRs are connected in series for
operation on a 480-volt line. The control is shown with a parallel
hook-up but it should be noted that a serial connection can also
be implemented.
Form 859-000511
Since all Opto 22 SSRs are zero voltage switching,
they are ideal for driving incandescent lamps because
the initial inrush current into a cold filament is
reduced. The life of the lamp is increased when
switched by a zero voltage turn on SSR. The
following table is a guide to selecting an Opto 22 SSR
for switching a given incandescent lamp.
Care should be taken in selecting a SSR for driving a heater load if
the load is cycled on and off in a continuous manner as might occur
in a temperature control application. Constant cycling can cause
thermal fatigue in the thyristor chip at the point where the chip
bonds to the lead frame. Opto 22 employs a thick copper lead frame
for mounting the SCR chips in the power series SSRs to eliminate
thermal fatigue failures. In addition, Opto 22 recommends operating
any SSR at 75% rated current for cycling heater loads to ensure
complete reliability.
The following table is a guide to selecting the proper SSR for a
given heater load.
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