Process Technology Lufran LUF Series Manual page 56

Maintenance Procedures (Continued):
M8: 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 M8-1: 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 M8-2: SSR Cooling Fan Replacement Procedure:
Refer to the instructions provided with the replacement SSR module for the replacement procedure.
M-43-25
Revision - Date 03-01-04-18
Figure 40: SSR Module (Top View)
Monitoring boards shown
SSR
HEATSINK TCO
TERMINAL STRIP
55
LUF-Series Lufran Manual
Standard outlet, Standard Interface