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Mounting and installation, Technical Description, T 811 086 en e
10.3.17 Connection for BX-MDH door holding magnet
The BX-MDH keeps fire protection doors open in the normal state and closes them in the event of an alarm.
To operate, the module requires an internal battery but no external power supply.
More information about the BX-MDH can be found in the data sheet T 811 142.
1
GND 1
LOOP 1
GND 2
LOOP 2
SHLD
SHLD
BX-MDH
X
2
1
External manual
release button
External door
limit switch
9V lithium
battery
S
H
L
D
S
H
L
D
L
2
L
1
G
N
D
G
N
D
IN2+
IN2-
IN1-
IN1+
X1
Fig. 146 BX-MDH, door holding magnet connection
10.3.18 Connection for BX-MDI8 input module
The BX-MDI8 has 8 monitored inputs for connecting detection zones or for polling potential-free contacts.
The module requires a redundant, external power supply for operation.
More information about the BX-MDI8 can be found in the data sheet T 811 143.
1
1
+
+
GND 1
LOOP 1
GND 2
LOOP 2
SHLD
SHLD
additional BX-MDI8
additional BX-MDI8
BX-MDI8
External
power supply
X
3
X
2
GND EXT_A
VEXT_A
VEXT_B
GND EXT_B
VEXT_B
GND EXT_B
GND EXT_A
VEXT_A
Fig. 147 BX-MDI8, input module connection