7 Maintenance
The SCADAPack 32P controllers require little maintenance. The 5V power LED indicates the status
of the 5V supply. If the LED is off, and the SCADAPack 32P controller is powered using the
integrated power supply, on board fuse F1 or F2 may require replacing. If the LED is off, and the
SCADAPack 32P 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 SCADAPack 32P Controller is not functioning correctly, contact Control Microsystems
Technical Support for information on returning the SCADAPack 32P Controller 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.
7.1 Fuses
Two 1.0 Amp slow-blow fuses protects the power supply. The fuse is mounted under the cover. Fuse
F1 protects the SCADAPack 32P when powered from the AC/DC Power Input. Fuse F2 protects the
SCADAPack 32P controller when powered from the DC Power Input. Refer to section
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. Control Microsystems part
number 200072.
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 sections
3.2.4-Recommended DC Power Supply Configuration
24VDC Battery Supply Configuration
for recommendations on reducing the DC inrush current if
fuse blowing is being experience in DC power supply applications.
7.2 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.
7.2.1
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.
SCADAPack 32P Controller Hardware Manual
May 26, 2006
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