Governors America DDM101 Quick Start Manual

1
INTRODUCTION
Th e DDM101 is an accessory module whose function is to drive two independent, feed-
back-equipped GAC electronic actuators (see TABLE 1) from one GAC ESD Electronic
Speed Device (see TABLE 2) Th is module is primarily installed where two actuators
are required for a single engine i.e., two independent diesel fuel pumps or two gaseous
throttle body actuators (ATBs).
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SPECIFICATIONS
DC Input Voltage
Actuator 1 Current
Actuator 2 Current
PWM Drive from Governors
Actuator Position Sensors
ENVIRONMENTAL
Operating Temperature
Humidity
Vibration
Shock
Dual Driver Module
POWER INPUT
18 - 32 VDC(Nominal 24V DC)
Transient protected to +/-250 VDC
Up to 15 Amps, Short Circuit protected
Up to 15 Amps, Short Circuit protected
550 Hz Min from 12-32 V DCMax am-
plitude
5V DC excitation 1 to 4V DC output
40° to +85°C
up to 100%
RELIABILITY
1G, 20-100 Hz
10 G (11ms)
PER CE EN55011, EN50081-2, and
EMC
EN50082-2
DDM101
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INSTALLATION
In the described applications, the desire is to drive two feedback-equipped, electric
actuators equally so that either banks or cylinder groups receive equal fuel levels. Th e
actuators should be of similar types with similar position sensors with equal outputs. To
equalize the fuel to each cylinder bank the DDM101 has two advanced features, fuel and
exhaust temperature balance. Th e fuel balance feature will correct any unbalances in
the fuel systems by equalizing the fuel being delivered by each actuator. Any diff erences
noted by the accurate actuator position sensors will be nulled out by the electronics so
that the position sensors will track equally throughout the range, unless compensated
with the FUEL BALANCE.
Engine power should be balanced by measuring the exhaust gas temperature readings at
each bank. Some mechanical calibration of the actuator linkage and the fuel rack will be
required to assure that the systems are nearly alike at one fuel delivery point. Th is can
be either idle fuel or any midpoint of load control. Th e FUEL BALANCE adjustment
is then used to set equal engine cylinder power at near 100% of engine load. In order
to achieve minimum diff erence at any load point, the mechanical linkage adjustments
should be set equal at 20% power with the electrical adjustments set equal at 80% power.
Each actuator driver circuit has its own GAIN [ACT 1 and ACT 2] adjustment to
optimize the feedback control loop response. (See TABLE 6)
Refer to (WIRING DIAGRAM 4.) for proper connections. It is suggested that the
DDM101 be mounted along side the Electronic Speed Device (ESD) . When mounting
the unit, attach it to a vertical surface to prevent any moisture from collecting on the
circuit board. Th e normal precautions outlined in the ESD manual should be followed
for the DDM101 as well.
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DDM101 Duel Driver Module 1.15.19
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