Routine Checks and Maintenance
9-4 7SJ62 Manual
C53000-G1140-C121-1
9.3 Maintenance
9.3.1 Replacing the Battery
The battery is used to retain the annunciation memory and waveform data in the event
of an interruption of the power supply. The battery also maintains the internal system
clock with calendar after a loss of the power supply.
The battery is checked by the processor at regular intervals. If the capacity of the bat-
tery is found to be declining, an alarm is generated.
The battery should be changed when an alarm is given, or at the latest, after 10 years
of service.
Recommended Battery:
Lithium Battery 3 V/1 Ah, Type CR 1/2 AA. For example:
− VARTA Order Number 6127 501 501
− Duracell
− Eveready
The procedure for exchanging the battery is dependent upon the construction of the
device. Following are the instructions for a device for flush mount and surface mount-
ing.
The battery is located near the front edge of the CPU printed circuit board. The front
panel of the device must be removed to change the battery.
To replace the battery:
o Save the waveform captures and the important data under the Annunciation sub-
menu (all items in this sub-menu). The records and data are lost when the battery is
removed. The simplest and fastest method for saving the records and data is to use
the save feature in DIGSI
®
4 when the program is on-line.
Note:
All of the protective and control settings, including the input/output configuration
and the CFC logic, are not affected by a power supply interruption. The settings are
saved independently of the battery. The settings are not lost when the battery is re-
moved, nor are the settings affected if the device operates without a battery.
o Have the replacement battery ready.
o Isolate the power supply by opening the protective switches for both terminals.
o Wear a grounded wrist strap or touch grounded metal to prevent electrostatic dis-
charges to the internal components of the device.
o Remove the covers on the front panel and loosen the screws that are securing the
front panel.
Caution!
Do not short the battery! Do not reverse the polarity of the battery! Do not lay the bat-
tery on the ground mat used to protect components from electrostatic discharges!
Do not recharge the battery!
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