12 Maintenance
The SCADAPack LP controller 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 SCADAPack LP 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
ports, unless the power is off or the area is know to be non-hazardous.
12.1 Fuses
A single 1.0 Amp fast-blow fuses protects the power supply. The fuse is mounted under the cover.
Refer to
Figure 2: SCADAPack LP Board Layout
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 R451 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.
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.
12.2.1
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 LP Hardware Manual
May 26, 2006
37
