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

Page 26

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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%