Det-Tronics EQP Fire and Gas Detection/Releasing System User Manual
Page 26

3-7
14.1
95-8533
Determining Power Requirements
Use of the EQP2110PS(–P) and EQP2120PS(–B)
Power Supplies provides the primary and secondary
supplies.
The EQP2410PS(–P) Converter provides the
secondary supply only. It is used in conjunction with
the EQP2110PS(–P) or EQP2120PS(–B) Power
Supplies, which serve as the primary supply (see
Figures 3-23A, B and C for available configurations).
The customer is responsible for providing adequate
secondary power supply source needs. The ac input
current requirements for EQP2XX0PS(–X) 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] + 0.43 A
Example:
[20 Adc x 28 Vdc ÷ 120 Vac ÷ 0.91] + 0.43 = 5.56 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.
NOTE
The suffix (-P) or (-B) defines the method for
mounting the panel mount models:
(-P) = mounting plate
(-B) = mounting brackets.
Table 3-3B – EQP2XX0PS Power Supply and Converter Specifications
Characteristic
Device
EQP2110PS(-P)
Power Supply
EQP2120PS(-B)
Power Supply
EQP2410PS(-P)
Converter
Input Frequency
60/50
60/50
N/A
Input Voltage
120/220 Vac
120/220 Vac
24 Vdc
Input Current, Max.
3.2 / 1.7 Iac
6.6 / 3.6 Iac
15.7 Idc
Output Voltage Range
24.5 … 28.0 Vdc
24.5 … 28.0 Vdc
24.5 … 28.0 Vdc
Supply Rating
10
20
10
Maximum Alarm Current
10
20
10
Maximum Standby Current
10
20
10
Efficiency
88%
91% for 120 Vac
93% for 220 Vac
88%