Windsor-Severence Fire Protection District
Heavy Rescue
Production Specification
SVI #774 Page 15 of 126 April 19, 2010
2. ALTERNATOR PERFORMANCE TEST
TEST AT IDLE
The minimum continuous electrical load shall be activated with the engine running at idle speed. The engine temperature
shall be stabilized at normal operating temperature. The battery system shall be tested to detect the presence of battery
discharge current. The detection of battery discharge current shall be considered a test failure.
TEST AT FULL LOAD
The total continuous electrical load shall be activated with the engine running up to the engine manufacturer’s governed
speed. The test duration shall be a minimum of 2 hours. Activation of the load management system shall be permitted
during this test.
An alarm sounded by excessive battery discharge, as detected by the warning system required in 13.3.4, or a system
voltage of less than 11.8 V dc for a 12 V nominal system, 23.6 V dc for a 24 V nominal system, or 35.4 V dc for a 42 V
nominal system for more than 120 seconds shall be considered a test failure.
3. LOW VOLTAGE ALARM TEST
The following test shall be started with the engine off and the battery voltage at or above 12 V for a 12 V nominal system,
24 V for a 24 V nominal system, or 36 V for a 42 V nominal system.
With the engine shut off, the total continuous electrical load shall be activated and shall continue to be applied
until the excessive battery discharge alarm activates. The battery voltage shall be measured at the battery terminals.
The test shall be considered a failure if the alarm does not sound in less than 140 seconds after the voltage drops to
11.70 V for a 12 V nominal system, 23.4 V dc for a 24 V nominal system, or 35.1 V for a 42 V nominal system.
The battery system shall then be able to restart the engine. Failure to restart the engine shall be considered a test failure.
LOW VOLTAGE - ELECTRICAL SYSTEM PERFORMANCE TEST
DOCUMENTATION
The manufacturer shall deliver the following with the fire apparatus:
1. Documentation of the electrical system performance tests
2. A written electrical load analysis, including the following:
(a) The nameplate rating of the alternator
(b) The alternator rating
(c) Each of the component loads specified that make up the minimum continuous electrical load
(d) Additional electrical loads that, when added to the minimum continuous electrical load, determine the total
continuous electrical load
(e) Each individual intermittent electrical load.
(112 paginas)
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