7.1
3-6
95-8533
Determining Power Requirements
Use of the EQP2120PS(–B) Power Supply does not
provide the source of the secondary supply. The
customer is responsible for providing adequate
secondary power supply source needs. The ac input
current requirements for EQP2120PS(–B) in relation to
EQP system dc current load (power supply output)
are calculated using the following formula:
Input Current = [Output Current x Output Voltage÷
Input Voltage ÷ Efficiency] + 0.4 A
Example:
[20 Adc x 28 Vdc ÷ 120 Vac ÷ 0.9] + 0.4 = 5.6 Aac
For Standby Current (amperes ac) requirements, use
Total Standby Current (amperes dc) for the system’s
applicable field devices from Table 3-1.
For Alarm Current (amperes ac) requirements, use
Total Alarm current (amperes dc) for the system’s
applicable field devices from Table 3-2.
Standby Current
Standby Time*
Standby Amp Hours
X
=
24 Hours
Alarm Current
5 Minute Alarm Time*
Alarm Amp Hours
X
=
0.083 Hours
Sum of Standby and Alarm Amp Hours
=
Multiply by 1.1 (10% Safety Factor)
X
Total Battery Amp Hour Requirement
T0014A
* FM MINIMUM REQUIREMENT FOR EXTINGUISHING SYSTEMS
IS 24 HOURS STANDBY TIME AND 5 MINUTES ALARM TIME.
Table 3-4—Backup Battery Requirements for Automatic Release of Extinguishing Systems Except Deluge
Standby Current
Standby Time*
Standby Amp Hours
X
=
90 Hours
Alarm Current
10 Minute Alarm Time*
Alarm Amp Hours
X
=
0.166 Hours
Sum of Standby and Alarm Amp Hours
=
Multiply by 1.1 (10% Safety Factor)
X
Total Battery Amp Hour Requirement
T0040A
* FM MINIMUM REQUIREMENT FOR DELUGE SYSTEMS IS
90 HOURS STANDBY TIME AND 10 MINUTES ALARM TIME.
Table 3-5—Backup Battery Requirements for Deluge and Pre-Action Applications
Table 3-3B—EQP2120PS(-B) Power Supply Specifications
Characteristic
EQP2120PS(-B)
Input Voltage
120-220 Vac
Input Current
4.9 Amps @ 120 Vac
@ 24.5 Vdc Output
2.9 Amps @ 220 Vac
Input Current
5.6 Amps @ 120 Vac
@ 28 Vdc Output
3.2 Amps @ 220 Vac
Input Frequency
60/50 Hz
Supply Rating
20 Amps
Maximum Alarm Current
20 Amps
Maximum Standby Current
20 Amps
Efficiency
90%
Summary of Contents for DET-TRONICS 95-8533
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