FRC RTU1-IS User manual

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TEL ( 516 ) 724-8888 FAX ( 516 ) 360-9727 TOLL FREE 1-800-645-0074
FOR CUMMINS ISB, ISC, AND ISM ENGINES
REMOTE THROTTLEREMOTE THROTTLE
REMOTE THROTTLEREMOTE THROTTLE
REMOTE THROTTLE
MODEL : RTU1- IS
OPERATING INSTRUCTIONS
26 Southern Blvd., Nesconset, NY11767
FRC s
PRESET
SETTING
IDLE
RTU
s
DECREASE
INCREASE
12001200
12001200
1200

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pAnalog High Idle to maintain any engine speed between 800 RPM and 2500 RPM.
pThe IDLE switch will bring the engine to idle quickly after operations.
pThe PRESET switch can be used to raise the engine RPM to a preset value. This
feature is very useful when the operator always operates at a commonly used engine
RPM. The preprogrammed engine RPM is field adjustable.
pSelf diagnostic with error codes display.
pSimple to install and easy to operate.
The RTU 1-IS is a state of the art remote throttle designed for fire apparatus equipped
with the Cummins ISB, ISC and ISM electronic engines. The RTU is connected to the
engine ECM through the remote throttle input. The RTU 1-IS remote throttle regulates
the engine RPM by supplying a voltage signal into the remote throttle input of the
ECM. A connection to the J1587 data link is also required to pick up the engine RPM
data and other pertinent information.Variable engine speed can be attained through the
RTU 1-IS by using the "INCREASE" and "DECREASE" pushbuttons. A "PRESET"
switch allows the operator to bring engine RPM to the predetermined RPM quickly by
the touch of a single switch.
INTRODUCTION :INTRODUCTION :
INTRODUCTION :INTRODUCTION :
INTRODUCTION :
FEATURES :FEATURES :
FEATURES :FEATURES :
FEATURES :
Remote Throttle RTU 1-IS

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INSTALLATION ...
Before proceeding with any installation, please check to make sure you have the fol-
lowing components. Call the factory if any components are missing. Components
supplied are as follows :
1) RTU 1-IS controller
2) Extension cable for power
3) Extension cable for J1587 data link
4) Extension cable for remote throttle input
MECHANICAL :
Installation for The RTU 1-IS is extremely simple. The control module can be mounted
anywhere on the pump panel. The RTU 1-IS control module has a square flange with
an overall dimensions of 4.25" X 4.25" . A cutout hole of 3.75" in diameter is required.
To ensure proper installation, carefully follow these procedures:
1) Locate a suitable position on the pump panel and make sure that check engine and
stop engine indicators are closely mounted near the RTU 1-IS controller.
2) Locate the center of the cutout hole and make a 3.75" diameter cutout.
3) Insert the RTU 1-IS controller into the cutout hole and locate the four 10-32 mount-
ing screw holes on the four corners of the flange.
4) The dimensions for locating the cutout hole and the mounting holes can be found in
Figure 9.

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ELECTRICAL WIRING:
Wiring for the RTU system is very simple. All extension cables are supplied with con-
nectors to simplify the interconnections. For complete wiring diagram, refer to Figure 1
What to connect?
1) Using the extension cable supplied, provide 12VDC(red wire) and ground(black
wire) to the electronic module. The white wire on the power cable is for safety inter-
lock. A 12VDC signal needs to be supplied to this white wire to activate the RTU
governor when the pump is engaged.
2) Connect the cable for the J1587 data link. The two J1587 data link outputs are avail-
able on the ECM B connector for the ISB and ISC engines, and on the 50 pin OEM
connector for the ISM engines. This J1587 data link is also used for the diagnostic
tool; therefore the data link is available underneath the dashboard where the diagnostic
tool is plugged in.
3) Connect the pressure transducer cable to the control module using the extension
cable supplied. This extension cable is terminated with two 4-pin Deutsch connectors.
4) The 'Remote Throttle ON/OFF" input has to be grounded when the pump is en-
gaged. Refer to Figure 1.
5) The 'Selected Throttle Control Switch' or the 'Accelerator Governor switch has to
be enabled. Refer to the section entitled "Interface to ECM" for details.
5) If an additional HIGH IDLE switch is desired, connect the switch and the potenti-
ometer using Figure 7.
PUMP ENGAGED INTERLOCK:
In most installations, 12 VDC from the OK to pump signal can be used as an interlock.
Wire this 12 VDC signal to the white wire on the power supply cable. The RTU will
not become active until 12 VDC is supplied to this white wire.
HIGH IDLE:
For fire apparatus that require HIGH IDLE, use Figure 7 to complete the wiring. An
optional HIGH IDLE kit ( part no.PRO 38-H ) which bundles all required components
is available from Fire Research.

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A) ISB and ISC Engines ...
In order for the RTU to operate on the Cummins ISC and
ISB engines,it is important that the ECM be programmed
properly and some of the inputs are enabled.
1) Program setting:
a) The remote throttle option in the ECM has to be turned on. This cannot be done using
the diagnostic tool. An authorized dealer with the 'INSIGHT' service tool is needed to turn
the remote throttle option on.
b) The ECM has 2 operating modes: 'Automotive' governor mode and the 'All-speed' gov-
ernor mode. For the ISB/ISC engines, the user must ensure that the default governor is
selected appropriately when programming the user features. Under normal operating situa-
tion, the cab foot throttle is set up as 'Automotive'(min/max) governor.
2) Enabling the 'All-speed' governor when the pump is engaged
For the RTU to work properly, the 'All-speed' governor mode has to be selected in the
ECM. Note: Select the 'All-speed' governor only when the RTU governor is active,
e.g: the pump is engaged.To select the 'All-speed' governor mode, the 'Selected Throttle
Control Switch' ( pin B6 ) has to be grounded. This is assuming that the cab foot throttle is
set up as min/max (Automotive ) governor. (The 'Selected Throttle Control Switch' toggles
the operating modes, ie: if the default mode is 'All-speed' governor, grounding the switch
will change the control mode to the 'Automotive governor.)
3) Enabling the 'Remote Throttle ON/OFF' input
In order for the remote throttle to be active, the 'Remote Throttle ON/OFF' input (ECM B
connector pin B45) has to be grounded. Since the 'All-speed' governor and the 'Remote
Throttle ON/OFF' inputs are enabled by grounding pin B6 and pin B45, both of these
signals can be activated together.
4) Remote Throttle input
Connect the Remote Throttle cable to the ECM B connector pin B9, B10, and B20. Refer
to Figure 1 for details.
Interface to the ECM
"A" Connector
"B" Connector

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B) ISM engines:
In order for the RTU to operate on the Cummins ISM engines,it is important that the
ECM be programmed properly and some of the inputs are enabled.
1) Program setting:
a) The remote throttle option in the ECM has to be turned on. This cannot be done
using the diagnostic tool. An authorized dealer with the 'INSIGHT' service tool is
needed to turn the remote throttle option on.
2) Enabling the 'Remote Throttle ON/OFF' input
In order for the remote throttle to be active, the 'Remote Accelerator Switch' input (50
pin OEM connector pin 43) has to be grounded. The 'Remote Accelerator Switch'
input is enabled by grounding pin 43.
3) Enabling the 'All-speed' governor when the pump is engaged
For the RTU to work properly, the 'All-speed' governor mode has to be selected in the
ECM. Note: Select the 'All-speed' governor only when the RTU throttle is ac-
tive, e.g: the pump is engaged.To select the 'All-speed' governor mode, the 'Accel-
erator Governor Switch' ( pin 25 ) has to be grounded. This is assuming that the cab
foot throttle is set up as min/max (Automotive ) governor. (The 'Accelerator Governor
Switch' toggles the operating modes, ie: if the default mode is 'All-speed' governor,
grounding the switch will change the control mode to the 'Automotive governor.)
4) Remote Throttle input
Connect the Remote Throttle cable to the 50 pin OEM connector pin 48, pin 49, and
pin 21. Refer to Figure 1 for details.
Interface to the ECM

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Simple to use !
The RTU is engineered with ease of operations in mind. All functions on the control
module are self explanatory. The large LED display shows the desired engine RPM
setting. The push buttons are color coded. The 'IDLE' button is in RED to indicate
quick shutdown. The YELLOW 'Increase' and 'Decrease' buttons indicate proceed
with caution. The 'Preset' button is in GREEN to indicate OK to operate.
OPERATIONS ...
How to operate ...
There are 4 pushbuttons on the control module :
1) "Increase" and "Decrease" buttons allow easy selection of desired RPM from IDLE to
maximum governed speed. Depress "Increase" to ramp the engine RPM up, and depress
"Decrease" to ramp the engine RPM down. The RPM will ramp up or down in 10 RPM
increments when pressed momentarily. When the pushbutton is held down, the RPM set-
ting will change by 10 RPM once, followed by 50 RPM twice and then by 100 RPM
thereon. Release the pushbuttons when desired RPM is reached.
3) The large "IDLE" button will bring engine to idle immediately after operations.
4) The "PRESET" button ramps engine to the preset RPM quickly and conveniently with
the momentary touch of a single button.
After the "PRESET" button is pressed, the "Increase" and "Decrease" buttons can still be
used to easily change the selected RPM. The "IDLE" button will bring the engine to idle.
How to change the preset RPM ?
The preset RPM setting can be changed by simply following steps (a) through (c):
a) Make sure the engine is at idle when changing the setting. If the engine RPM is not at
idle, press "IDLE" button to bring engine to idle.
b) Press "PRESET" button and hold it until the display is flashing. While still holding in
the "PRESET" button, use the "Increase" or "Decrease" button to program the new preset
RPM.
c) When the new desired preset RPM is obtained, release the "PRESET" switch and the
new preset RPM will be stored in the memory.

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1) The " IDLE " switch brings engine to idle immediately after operations
2) The " INCREASE " switch ramps engine RPM up
3) The " DECREASE " switch ramps engine RPM down
4) The " PRESET " switch ramps engine to the preset RPM quickly and conveniently.
Figure 3
FUNCTIONS FOR SWITCHES ...
2
3
1
FRC s
PRESETPRESET
PRESETPRESET
PRESET
SETTING
IDLE
RTU
s
DECREASE
INCREASE
12001200
12001200
1200
4

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Specifications :
Dimensions :
Response : Idle to full governed speed
Pressure Recovery : On open/close valve
Max. RPM :
4.25"W X 4.25"H X 3.75"D
3 seconds maximum
1 1/2 seconds
2500 RPM
Control Module :
RPM mode : Idle to 2500 RPM
Operational :
Electrical :
Power :
Current :
Microprocessor :
12 VDC
1/2 A continuous
8 Bit single chip MicroComputer

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SYSTEM WIRING BLOCK DIAGRAM :
RED = 12 VDC
BLACK = GND
WHITE = 12 VDC. Pump
interlock signal
Figure 1
2
1
3
Refer to Figure 7
Power cable
3
2
1
Engine Control
HIGH IDLE
High Idle cable
CONTROL MODULE
4J1587 Datalink
J1587 Datalink
RED = positive ( B49 )
BLACK = negative (B50 )
4
NOTE:
1) Remote Throttle ON/OFF input (Pin B45 on ECM B connector) has to be grounded
when the pump is engaged.
2) 'Selected Throttle Control Switch' (Pin B6 on ECM B connector) has to be grounded
when the pump is engaged.
3 pin Deutsch receptacle
3 pin Deutsch plug
2 pin Packard receptacle
For ISB and ISC Engines:
3 pin Packard connector
( Receptacle )
TO ECM
10
9
20
45
Red (5V reference)
White(signal to ECM)
Black(signal return)
Remote Throttle ON/
OFF switch
Selected Throttle
Control Switch
ON/OFF
Supply ground when
the pump is engaged
ECM B
Conn.
6