3
5.3.
Configuration for EB mode
In EB (= EB-1) compatibility mode, switches 1-5
set the cabinet address, while switches 6 and 7
control the transmission rate (see tables 3-5).
Switch
Set(s)
1-5
5-bit address of cabinet in EB mode
6-7
baud rate (see table 5)
8
always 1 (on) for EB mode
Table 4. Switch assignments in EB mode
Switch
6
7
Transmission rate (baud)
-
-
2400
-
on
4800
on
-
9600
on
on
19.2 k
Table 5. Setting the transmission rate of the
RS-485 interface in EB mode.
5.4.
Cabinet programming
For more information on EB mode, consult the 'MC
EB Users Manual for Remote Control'.
SNM/EB-2 programming is taught in the SNM/EB-2
Programming Manual.
6. D-connector pin assignments
The pin assignments of the 9-pin D-connectors are
given in table 6 below. In EB-1 mode, only the
leftmost D-connector (front view) is active.
Pin Description
1
not connected
2
B
tx'
inverting output
o
(
- out)
3
A
tx'
non-inverting output
o
(
+
out)
4
B
rx'
inverting input
o
(
- in)
5
A
rx'
non-inverting input
o
(
+ in)
6
not connected
7
not connected
8
not connected
9
not connected
Table 6. Pin assignment of the 9-pin D connectors
7. Replacing the electric fans
(Qualified service personnel only)
The two electric fans must be changed every five
years (replacements may be obtained from Siqura).
The procedure for mounting a new fan is as follows
(see also figure 3):
1. Power down the MC 11 EB-2 cabinet and wait
>3 minutes.
2. Remove the black cover with the mounted fans.
3. Disconnect fans to be replaced from their power
supplies (see figure 3: these two connectors sit
side by side). Since the wires run between circuit
board and panel, it will usually be necessary to
loosen the screws holding the wires in the
connectors.
Do not disconnect the wires of the
similarly
shaped,
single
mains
voltage
connector at the opposite corner of the board.
4. Remove disconnected fans and replace them with
new ones. Make certain the blowing direction is
outwards.
Please use the washers and nuts as
indicated for one of the fastening screws.
5. Reconnect the fan power supply wires, observing
correct polarities. Tighten the screws carefully.
6. Replace the cover.
7. Reconnect the power cabinet to the mains. Check
whether the fan is blowing outwards.
8. Replacing and checking the primary fuses
1. Power down the MC EB-2 cabinet by
disconnecting it from the power supply.
2. The primary fuse (1 in figure 4) is located right
under the mains socket. Table 7 lists fuse data.
Power voltage
fuse value
type
230 Vac
250 V/1.6 A, time-lag
glass, 5x20 mm
120 Vac
250 V/3.15 A, time-lag glass, 5x20 mm
Table 7. Replacement fuses
3. Reconnect power to switch on the cabinet.
1
Figure 4. Replacing the fuse of the MC 11 AC EB-2
Figure 3. Replacing a fan (view from above, left fan). A
fan's power connector has two fastening screws for the
fans' power supply wires; polarities are indicated on the
circuit board.
1
circuit
board
supply wires
to second fan
2
