Saia-Burgess Controls AG
Manual PCD7.D412DTPF & PCD7.D4xxxT5F │ Document 27-620 – Release ENG07 │ 2019-06-20
2-3
Technical data
Technical data of the SVGA MicroBrowser panel
2
2.2.2
Battery of the pWeb panel
The hardware components are maintenance-free, with the exception of the CPUs
for the pWeb panel, whose battery requires occasional replacement.
The components do not contain any user-replaceable parts. If hardware problems
occur, please return the components to Saia-Burgess Controls.
The resources (register, flags, timer, counters, etc.) and the character strings/DBs
are stored in the RAM. In order to prevent these from being lost, and to enable
the hardware clock to carry on running during a power failure, the devices are
equipped with a back-up battery:
CPU model
Buffer
Buffer time
PCD7.D4xxx
Renata CR 2032 lithium battery
1-3 years
1)
1)
Depending on the ambient temperature: The higher the temperature, the shorter the buffer time.
New controllers include batteries in the scope of delivery, and these must be
inserted during commissioning. Pay attention to the polarity of the batteries.
CPUs with lithium batteries are not maintenance-free. The battery voltage is moni
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tored by the CPU. The status LED lights up (12” pWeb panel only) and XOB 2 is
called if:
■ the battery voltage is lower than 2.4 V;
■ the battery is missing.
In order to avoid data-loss, we recommend changing the batteries while the panel
is connected to the power supply.
■ Disconnect from the voltage supply.
■ Remove the cover of the pWeb panel.
■ To prevent data loss while changing the battery 119B, reconnect to the voltage
supply.
■ Push the terminal holder back slightly (see arrow in figure).
■ Remove the battery.
■ Insert a Renata CR 2032 button battery so that the positive terminal is in con
-
tact with the terminal holder.
■ Disconnect from the voltage supply and reattach the back wall of the panel.
