Diesel Engine Fire Pump Controller
4
EATON CORPORATION
www.eaton.com
CAUTION
Do not apply an AC voltage to these terminals.
Terminals 60 through 95, located on the I/O Board, are for
connection of all output relay functions.
NOTE
All field connections and AC wiring must be brought into the enclosure
through the lower right or bottom right side ONLY (refer to labels affixed
inside enclosure).
*OTHERWISE WARRANTY IS VOID.*
2.3.1 Wire Sizes
For control wiring, use #14 AWG wire for all electrical
connections.
For power wiring sizes refer to Appendix K.
2.4 System Pressure Connection
The FD120 is supplied with a Pressure Sensor, or as an option, a
Pressure Switch.
The “TEST” drain connection, located to the left of the system
pressure connection, should be piped to a drain or to waste.
NOTE
Water lines to the drain valve and pressure switch must be free from dirt
and contamination.
The main controller panel interfaces with either the pressure
sensor or the optional pressure switch. The controller must be
programmed for the appropriate device.
Using the standard pressure sensor, the actual pressure is
displayed on the top left hand corner of the LCD display. Precise
start and stop pressure set points can be programmed into the
controller via the membrane keypad. Pressure readings are also
recorded in the memory during alarm situations or pressure
deviations.
With the Pressure Switch option, the LCD will display “OK” if
the pressure is satisfied, and “LOW”, if the contacts on the
pressure switch change state. The message history will record
“Low Pressure” when the pressure drops below the set point.
3. HARDWARE DESCRIPTION
3.1 General
The purpose of this section is to familiarize the reader with the
Diesel Plus Controller hardware, its nomenclature, and to list
the unit’s specifications.
3.1.1 Battery Chargers
Battery chargers are independent of each other and produce a
maximum of 10 amps each at full rate. Each battery charger is
fully electronic and will protect itself by shutting down during a
short circuit condition.
The maximum current draw that the chargers will draw when
operating at 100% charging rate is:
12 Volt System
24 Volt System
1.6 amps - 120V
3.2 amps - 120V
0.8 amps - 240V
1.6 amps - 240V
3.1.2 Three Step Charge
The battery chargers incorporate a three step charge to
guarantee the fastest charge times while optimizing battery life.
The three steps are referred to as Bulk mode, Overcharge Mode
and Float mode.
Bulk
In Bulk mode, a current of 10 Amps is delivered into the battery
until the voltage reaches 2.4 Volts per cell for Lead Acid
Batteries. (14.4 Volts for a 12 Volt battery). At this point, the
battery has recovered approximately 90% of its capacity.
When the charger senses this state, it switches to the
Overcharge mode.
The bulk mode charging may take up to 24 hours depending on
the battery capacity and the level to which it was discharged.
The charge mode is recorded in the Diesel Plus message
history.
Overcharge
In the Overcharge mode, the voltage on the battery is held at
14.4 Volts and the current into the battery declines. This mode is
maintained until the current into the battery declines to
1.5 Amps. At this moment, the battery is approximately 99%
charged and the charger will change to Float Mode.
The overcharge mode charging may take up to 12 hours
depending on the battery capacity and the level to which it was
discharged. The charge mode is recorded in the Diesel Plus
message history.
Float
In Float Mode, the charger maintains the battery voltage at
2.23 Volts per cell for a lead acid battery (13.4 Volts for a 12 Volt
battery). Once Bulk and Overcharge modes are completed, the
charger will maintain the battery charge in Float mode by
regulating to 13.3V. If the charger cannot maintain the battery
capacity while in Float mode, the charger will begin a new
charging sequence by entering Bulk mode.
3.1.3 Charger Shut Down
The charger will automatically shut down if there is no load
connected to the output or if there is a short on the load side of
the charger. In addition, the charger will not operate if a battery
is connected incorrectly or if the wrong voltage of battery is
connected.
