9440300990 30-1
DECS-250 Maintenance
30 • Maintenance
These servicing instructions are for use by qualified personnel only. To
reduce the risk of electric shock, do not perform any servicing other
than that specified in the operating instructions unless you are
qualified to do so.
Before performing any maintenance procedures, remove the DECS-
250 from service. Refer to the appropriate site schematics to ensure
that all steps have been taken to properly and completely de-energize
the DECS-250.
Storage
If the unit is not installed immediately DECS-250, store it in the original shipping package in a moisture-
and dust-free environment.
Preventive Maintenance
Connections
Periodically check the connections of the DECS-250 to ensure they are clean and tight and remove any
accumulation of dust.
Electrolytic Capacitors
The DECS-250 contains long-life aluminum electrolytic capacitors. For a DECS-250 kept in storage as a
spare, the life of these capacitors can be maximized by energizing the device for 30 minutes once per
year. The energizing procedure for the DECS-250 is shown below.
DECS-250
1. Apply control power as indicated by the device style number. For this maintenance procedure, it is
recommended that the applied voltage not exceed the nominal value.
• Style Lxxxxxx: 24/48 Vdc (16 to 48 Vdc)
• Style Cxxxxxx: 120 Vac (82 to 120 Vac at 50/60 Hz) or 125 Vdc (90 to 125 Vdc)
2. Apply operating power within one of the following ranges.
• 56 to 70 Vac
• 100 to 139 Vac, or 125 Vdc
• 190 to 277 Vac, or 250 Vdc
When energizing the DECS-250 from a low impedance source (such
as a wall outlet), use of an Inrush Current Reduction Module (ICRM) is
recommended to prevent damage to the DECS-250. For a detailed
description of the Inrush Current Reduction Module, refer to Basler
publication 9387900990. ICRM connections are illustrated in Typical
Connections.
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