12
Federal Signal
signaling.fedsig.com
Failure to conduct a compatibility check per the guidelines listed below may lead to property damage, serious injury,
or death.
Models with no LED
•
Standby Mode Impedance: Equal to the EOL Resistor value (no EOL Resistor equals infinite Ω).
•
Alarm Mode Impedance: Equal to the Series Resistor value (no Series Resistor equals 0Ω).
Models with Factory Provided LED
•
Standby Mode Impedance: Equal to the EOL Resistor value (no EOL Resistor equals infinite Ω).
•
Alarm Mode Impedance: Variable. Based on EOL selected and models rated voltage. Refer to Table 1 below. Models
with a factory provided LED will contain the following installed LED series resistors: 6 V model: 470 Ω, 12 V model:
1 KΩ, 24 V: 1.8 KΩ, and 48 V model: 3.3 KΩ. Table 1 takes this additional impedance into account.
Table 2 Alarm Mode
ALARM MODE NOMINAL IMPEDANCE FOR A CALLPOINT
WITH LED MODULE
6 V
12 V
24 V
48 V
EO
L RESI
ST
OR
470
235.00
319.73
1000
319.73
500.00
642.86
2200
387.27
687.50
990.00
1320.00
3300
411.41
767.44
1164.71
1650.00
4700
427.27
824.56
1301.54
1938.75
5000
429.62
833.33
1323.53
1987.95
5600
433.61
848.48
1362.16
2076.40
10000
448.90
909.09
1525.42
2481.20
12000
452.29
923.08
1565.22
2588.24
15000
455.72
937.50
1607.14
2704.92
22000
460.17
956.52
1663.87
2869.57
33000
463.40
970.59
1706.90
3000.00
47000
465.35
979.17
1733.61
3083.50
Electrical Specifications
Maximum Input Voltage: 6, 12, 24, or 48 Vdc when LEDs are present; if no LEDs are present, 48 Vdc maximum.
Maximum Input Current: 5 A / 1 A*
*1 A with FS-approved diode installed (See Table 2 on page 23 for the diode part number.)
Before connecting to the power, confirm that the external voltage source and internal EOL/Series resistor values are in
accordance as shown above. The resistance of the resistor modules are marked on the resistor module enclosures. If
the EOL/series resistor value chosen is outside the range above, the hazardous area safety protection of the Ex potted
module is compromised. The maximum power dissipation on the resistor is 1 W. Failure to observe this warning may
lead to property damage, serious injury, or death.
Maximum Ground Wire: 12 AWG / 2.05 mm
