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Document No: LT0122 F3200 Installation & Programming Manual
Configuring a FIP
Issue 2.7 5 July 2001 Page 5-7
5.3.5 BATTERY TEST RESISTORS
The standard battery test resistor is suitable for a battery of capacity of up to 6.5AHr.
For larger batteries, additional resistors must be fitted, either directly to the MAF/PSU pcb (in
R34 and/or between Battery Test tabs), or within the FIP and wired to the Battery test tabs.
Where the additional resistors are carrying a current of greater than 0.7A, a 24Vdc relay
must be fitted to switch the load as shown in Fig 5.3.1. (Note the diode polarity, the ▌end is
marked on the case).
Battery test current is calculated as 0.1C at 25V where C is the battery ampere hours. E.g.
1A test current is required for a 10Ahr battery.
The standard battery test current of 0.65A includes FIP quiescent current. Table 5.3.1
shows the additional battery test resistors that must be fitted for various battery sizes. It is
calculated using the quiescent current of a base FP0550 (or FP0551). In general, a FIP
requiring larger batteries will have a higher quiescent current than that of a base FP0550,
and so a smaller additional test current than that shown could be used.
Because the battery test runs only for 1 minute and is then disabled for greater than 1
minute, resistors may be used at full power rating, or even slightly greater. (Resistors of
power ratings greater than that shown may be used).
Total Additional Relay
Battery Test Test Additional Resistor Rating
Capacity Current Current Resistance Combination Amps
Ahr A A Ohms Ohms/Watts (at 24Vdc)
6.5 .65 - - - -
10 1.0 .35 71.4 68E 10W -
17 1.7 1.05 23.8 22E 20W 2
OR 27E 20W//
180E 5W
28 2.8 2.15 11.6 12E 50W// 2.5
330E 2W
OR 10E 50W
33 3.3 2.65 9.43 10E 50W// 3
150E 5W
40 4.0 3.35 7.46 15E 50W// 4
15E 50W
OR 10E 50W//
27E 20W
60 6.0 5.35 4.67 4E7 100W 6
OR 10E 50W//
10E 50W//
68E 10W
Note : // means "wired in parallel with".
TABLE 5.3.1
BATTERY TEST RESISTORS