Oce 7050 Technical & Service Manual page 162

Electrical description
The roll unit control PBA 12PBA01 is used to communicate with the basic ma-
chine and to control the operation of the roll unit. The 24V supply for the roll
unit and the 5V supply for the operation of the roll unit control PBA 12PBA01
are supplied by the basic machine. The 5V supply for the rest of the roll unit is
generated by the roll unit control PBA 12PBA01 by means of a DC/DC con-
vertor.
Three relays are used on the roll unit control PBA 12PBA01. Relay K5 is the
safety relay. When a drawer is opened, door switch upper roll 12S1 or door
switch lower roll 12S2 (Océ 7056) is interrupted. Relay K5 is de-activated and
the 24V and the 5V are switched off. In case of an Océ 7055 there is no door
switch lower roll 12S2. Therefore there is a jumper connection between X6
pins 1-2 and X6 pins 3-4 (See the electrical diagram at the next page).
The upper roll or the lower roll are selected by means of the signal FEDMO-
SEL. This signal activates or de-activates the relays K3 and K4, thereby select-
ing the drive motor upper roll 12M1 or the drive motor lower roll 12M2.
An optional dew preventer can be connected.
It is advisable to switch on the dew preventer when the relative humidity
Note:
is > 65%.
A LED V1 is located on the roll unit control PBA 12PBA01. During normal
operation this LED flashes with a frequency of 2.5 Hz. When this is not the
case, there is something wrong with the software.
LED V15 indicates if the 5V is present.
ed. 6 12 Paper roll feed 601