14 Maintenance
The SCADAPack 350, as with all other SCADAPack controllers, requires little maintenance. The
Power Mode LED indicates the status of the 5V supply. If the LED is off, the on board fuse F1 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 controller is not functioning correctly, contact Control Microsystems Technical Support for
information on returning the SCADAPack Controller for repair.
WARNING:
Do not connect or disconnect any field wiring, including the wiring to the RS-232
and USB, unless the power is off or the area is known to be non-hazardous
14.1 Fuses
A single 1.5 Amp fast-blow fuse protects the power supply. The fuse is mounted under the cover.
Refer to
for the 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, part number
045301.5
or
R45101.5
. This fuse is available in a
package of 10 from Control Microsystems as part number 297327.
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.
14.2 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.
14.2.1
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.
1.
Save the existing program running in the SCADAPack, if applicable.
2.
Remove power from the SCADAPack.
3.
Remove the SCADAPack top cover and locate the battery. It is found at the far right side of the
circuit board.
4.
The battery tie wrapped in place at the factory. This is to ensure the battery does not become
disconnected during shipment. Cut the tie wrap using wire cutters.
5.
Remove the battery by gently lifting it straight up from the circuit board. The battery has two
pins that mate with two sockets on the circuit board.
6.
Replace the battery. A replacement tie wrap is not necessary.
SCADAPack 350 Hardware Manual
February 14, 2007
53
