Honeywell MRP-2001E Benutzerhandbuch

Power Supply Calculations

100

MRP-2001 & MRP-2001E   PN 53040:A  4/16/2007

The control panel must be able to power all internal and external devices continuously during the 
non-fire alarm condition.  To calculate the non-fire alarm load on the system power supply when 
primary power is applied, use Calculation Column 1 in Table 5-3 on page 101.  The control panel 
must support a larger load current during a fire alarm condition.  To calculate the fire alarm load on 
the power supply, use Calculation Column 2 in Table 5-3 on page 101.  The secondary power 
source (batteries) must be able to power the system during a primary power loss.  To calculate the 
non-fire alarm load on the secondary power source, use Calculation Column 3 in Table 5-3 on page 
101.

When calculating current draw and the battery size, note the following:

• ‘Primary’ refers to the main power source for the control panel

• ‘Secondary’ refers to the control panel’s backup batteries

• All currents are given in amperes (A).  Table 5-2  shows how to convert milliamperes and 

microamperes to full amperes. 

Use Table 5-3 on page 101 to calculate current draws as follows:

1. Enter the quantity of devices in all three columns

2. Enter the current draw where required.  Refer to the Device Compatibility Document for 

compatible devices and their current draw

3. Calculate the current draws for each in all columns

4. Sum the total current for each column

5. Copy the totals from Column 2 and Column 3 to Table 5-4 on page 102

Following are the types of current that can be entered into Table 5-3 on page 101:

Calculation Column 1 - The primary supply current load that the control panel must 
support during a non-fire alarm condition, with AC power applied. 

Calculation Column 2 - The primary supply current load that the control panel must 
support during a fire alarm condition, with AC power applied.

Calculation Column 3 - The standby current drawn from the batteries in a non-fire 
alarm condition during a loss of AC power.