BECKHOFF C1230S - Manual (Page 11)

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ISA Bus interface card C1230S 11
C1230S
Uninterruptible Power Supply
Monitoring of the external 24 V power supply can be activated by setting
bit 7 of port C in the input/output component belonging to the multi-function
board at address 232H.
If the external voltage supply falls below 16 volts when active, the multi-
function board switches over to battery operation, and informs the software
of this by clearing bit 3 of port C.
The NiCad battery (18 V / 0.65 Ah) supplies the device for up to 15
minutes, depending on how fully charged the battery is and on the
hardware installed in the IPC, giving the software time to save all its data.
When all the data has been saved the software can switch the device off
by clearing bit 7 of port C at address 232H.
If, during operation under emergency power, the battery voltage falls below
16 V, a signal is sent to the software by clearing bit 2 of port C at address
232H.
The Charging System
An integrated charger ensures that the battery is always kept fully charged.
The charging current is 1/3 of the full capacity, i.e. about 230 mA. The
charging procedure therefore takes up to 3 hours, depending on the charge
already in the battery. Overcharging, and consequent damage to the
battery, is prevented through the use of an integrated charging controller.
Port B of the input/output chip carries a signal that provides information
about the state of charge.
Port B
Address 231H
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Input
The signal from the charge
controller provides informa-
tion about the state of
charge. Charge
controller not used not used not used not used not used not used not used
The battery charger on the multi-function board can take up the following
states:
Fast charging When the operating voltage has been switched on, the charger goes into
the fast charging state if a battery is connected. The battery is charged with
a constant current of about 230 mA. Bit 7 of port B at address 231H is 0.
Battery not connected The charger recognises whether or not the battery is connected. If there is
no battery connection, bit 7 of port B at address 231H is set.
Fast charging completed If the charging has been ended by the charging controller, bit 7 of port B at
address 231H alternates between 0 and 1 with a period of 250 ms.