12 Maintenance
The SCADAPack32 controllers require little maintenance. The 5V power LED indicates the status of
the 5V supply. If the LED is off, and the 5232 Controller is powered using the integrated power
supply, on board fuse F1 or F2 may require replacing. If the LED is off, and the 5232 Controller is
powered using a 5103 power supply fuse F1 (5V) or F2 (24V) on the 5103 may require replacing. If
the program is lost during power outages, the lithium battery may require replacement.
The analog input and output circuitry is calibrated at the factory and does not require periodic
calibration. Calibration may be necessary if the module has been repaired as a result of damage.
If the SCADAPack32 controller is not functioning correctly, contact Control Microsystems
Technical Support for information on returning the SCADAPack for repair.
WARNING: Do not connect or disconnect any field wiring, including the wiring to the RS-232
ports, unless the power is off or the area is know to be non-hazardous.
12.1 Fuse
Two 1.0 Amp slow-blow fuses protects the power supply. The fuse is mounted under the cover. Fuse
F1 protects the 5232 Controller when powered from the AC/DC Power Input. Fuse F2 protects the
controller when powered from the DC Power Input. Refer to Figure 1 for their location.
CAUTION: Remove power before servicing unit.
Always replace a defective fuse with a fuse of the same rating. Under no circumstances should a fuse
be bypassed or replaced with a fuse of a higher rating.
The fuse is a Littelfuse Nano-SMF. Littelfuse part number LF R452 001. This fuse is available from
Control Microsystems.
In all cases investigate and correct the cause of the fuse failure before replacement. Common causes
of fuse failure are short circuits and excessive input voltages.
Refer to the DC power supply configuration subsection on each I/O module for recommendations on
reducing the DC inrush current if fuse blowing is being experience in DC power supply applications.
12.2 Lithium Battery
A small lithium battery powers the CMOS memory and real-time clock when input power is
removed. The voltage of a functioning battery should be greater than 3.0V. An application program
can monitor this voltage. Refer to the programming manual for details.
The battery should not require replacement under normal conditions. The shelf life of the battery is
10 years. The battery is rated to maintain the real-time clock and RAM data for two years with the
power off. Accidental shorting or extreme temperatures may damage the battery.
12.3 Battery Replacement Procedure
The battery is plugged into the circuit board and secured with a tie-wrap. If necessary it can be
replaced with an identical battery available from Control Microsystems.
• Save the existing program running in the SCADAPack, if applicable.
• Remove power from the SCADAPack.
• Remove the SCADAPack top cover and locate the battery. It is found at the far right side of the
circuit board.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
47
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