SBC PCD3 Series - Data Retention During Power Failure

Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Data retention in the event of power failure
PCD3.Mxxx0 Classic CPU and expansion enclosure
3-29
3
3.10 Data retention in the event of power failure
Theresources(registers,ags,timers,counters,etc.)andpartly,alsotheuser
program and texts/DBs, are stored in the RAM. To ensure that they do not get lost
during a power failure and (if any) the hardware clock continues to run, the PCD3
isequippedwithabu󰀨ercapacitor(SuperCap)orabu󰀨erbattery:
CPU type 󰀨 󰀨
PCD3.M3xx0 Super Cap (soldered, maintenance free) 4 hours
1)
PCD3.M5xx0/M6xx0 Lithium battery Renata CR 2032 1-3 years
2)
1)Thetotalchargetimeisabout10minutes.Forbu󰀨ertimes>=4hours,seebatterymodulePCD3.R010.
2)Dependingontheambienttemperature,thehigherthetemperature,theshorterthebu󰀨eringtime
For new controllers, the batteries are included in the package and must be used
during commissioning. Note the polarity of the batteries:
The positive pole symbol + of the button batteries Renata CR 2032 must be
visible!
The CPU with lithium batteries are not maintenance free. The battery voltage is
monitored by the CPU.
For the following criteria the LED BATT is activated and the XOB 2 is called:
●thebatteryvoltageislessthan2.4V
●thebatteryisdischargedorhasaninterruption
●thebatteryismissing
To avoid data loss, it is recommended to change the battery while the Saia PCD
®
is under voltage.
3.10.1 Battery module PCD3.R010 for PCD3.M3xxx
SincethePCD3.M3xxxisonlybu󰀨eredbytheSuperCap(upto4hours),abattery
modulethathasthesamebu󰀨ertimeasthebatteriesinthePCD3.M5xxx/M6xxx
isoptionallyavailable.Thebatterymodulemayonlybepluggedintoslot#3ofthe
PCD3.M3xxx. The other slots do not cover RAM (Program/Data Memory) or Clock.
This can damage the Saia PCD
®
.
Internal current draw: 10 mA an +5 V
Warning: When unpacking and during assembly
●Donottouchthepowercircuitboard(PBC)attheLEDholder!
●DonottouchtheelectronicsideofthePCB!
●BeforepluggingthePCBintotheSaiaPCD
®
,switcho󰀨thePCD!