Process Technology LUFRAN Instruction page 90

Maintenance Procedures (Continued):
M9:
SSR Cooling Fans
Each solid state relay (SSR) module has an aluminum heat sink with a cooling fan
mounted on the underside. This fan draws cool air into the unit through the underside
of the cabinet. These SSR modules are located at the bottom of the electrical side of
the cabinet. The cooling fan should be operating continuously while power is applied.
Procedure M9-1: SSR Cooling Fan Inspection Procedure:
Open the front cabinet door. Verify that the cooling fans are operating. If a cooling fan
has stopped, it must be replaced. Since a failed SSR fan will cause thermal stress to
those SSRs mounted on the heat sink, it is recommended to replace the entire SSR
module rather than just the fan.
Procedure M9-2: SSR Cooling Fan Replacement Procedure:
Refer to the instructions provided with the replacement SSR module for the replacement
procedure.
M-43-01
Revision - Date: 08 – 04/06/15
Figure 48: SSR Module (Top View)
SSR MONITOR
SSR
HEATSINK TCO
TERMINAL STRIP
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Lufran Single Outlet Manual