4466 EXTERNAL POWER SUPPLY
- FIRE ALARM SOLUTIONS TECHNICAL DESCRIPTION
13
4.7.
SHORT CIRCUIT ISOLATOR
The external power supply, 4466, has a built-in short circuit isolator that requires no separate COM loop address. Like any other
short circuit isolator, it will be given an individual sequence number when programmed in EBLWin or via automatic addressing
function.
For systems ≤ EBL512 G3 2.2.x: The isolators must be connected consecutively regarding sequence number 00-127, in the COM
loop's A-direction.
For systems ≥ EBL512 G3 2.3.X: The sequence numbers can automatically be generated and sorted consecutively in the COM
loop's A-direction. Function “Arrange sequence numbers” in EBLWin must be activated. (Tools/Options/EBLWin Settings).
Parameter
Memn
Value
The maximum line voltage
V
max
30V DC
The nominal line voltage
V
nom
24V DC
The minimum line voltage
V
min
12V DC
The maximum rated continuous current with the switch closed
I
C max
350 mA
The maximum rated switching current on short circuit conditions
I
S max
2 A
The maximum leakage current with the switch open
I
L max
1.5 mA
The maximum series impedance with the switch closed
Z
C max
90 mΩ
The maximum voltage at which the device isolates
(i.e. close to open)
V
SO max
11V DC
The minimum voltage at which the device isolates
(i.e. close to open)
V
SO min
5V DC
The maximum voltage at which the device will change
from open to close.
-
N/A
1
The minimum voltage at which the device will change
from open to close.
-
N/A
1
1) The device can change from open to close by commands from the control and indicating equipment only. This can be done at minimum to maximum line
voltage, i.e. 12V DC – 30 V DC.
For more information on short circuit isolators, see the Planning instructions for EBL128 or EBL512 G3 version 2.3.x or later.