Emergency Shutdown
Sensor input number 32 is dedicated to Emergency Shutdown. The
Emergency Shutdown sensor input overrides the Test timer. Additionally,
sensor input 29 can be configured as a Class “A” or Class “ESD” input.
Remote Reset
(optional, Setup 5 = 1, 3, 5 or 7)
When the Remote Reset feature is selected, point 30 with a closed contact
resets the TTDJ in the same manner as when using the Reset key. The
closed contacts to operate the Remote Reset feature should be kept closed
only momentarily for approximately 1 second to cause a remote reset.
Remote Lockout
(optional, Setup 5 = 2, 3, 6 or 7)
The Remote Lockout inhibits the Class B1 and Class B2 Lockout timers.
These Lockouts are ignored when a closed switch is seen at Input 31. An
open switch at Input 31 allows the Lockouts to function normally. When the
Remote Lockout is active it resets Class “C”, “B1” and “B2” Lockout timers.
This is intended to be used with automatic starting systems. With a con-
tact closure on terminals 31 with the unit not running, the display will
alternate between either RPM (-T models) and the Class “B1” timer, or
the display will flash (non-T models). The TTDJ should be put into
remote lockout immediately before stopping the engine. The contact clo-
sure should be opened once the engine is running. At that time the “B1”
and “B2” timers will be allowed to count down.
Reset Key
The Reset key resets All faults and initiates the Class “B” timers.
Overspeed
(-T models only)
These models feature an internal tachometer with Overspeed Shutdown
(50). This shutdown bypasses the Ignition Ground Delay. It is not
locked out by the Test Timer.
Underspeed Annunciation
(-T models only)
TTDJ-IGN-T models display (51) when an underspeed condition occurs. It is
not locked out by the Test Timer.
Loss of Ignition Annunciation
(non -T models)
The TTDJ-IGN models will display (51) when ignition input is lost. It is
not locked out by the Test Timer.
Run/Stop Key
(Manual Stop)
The Manual Run/Stop key is used for system shutdown from the panel.
When pressed, the unit will shutdown the system without turning on the
Alarm Output (on -DC models the Alarm Output is turned off on Manual
Stop). Manual Stop (Shutdown 52) is not locked out by the Test Timer.
Low Backup Battery Voltage
(-IGN models)
The TTDJ-IGN models have an internal backup battery. When the
“Lowbatt” display appears (this message will alternate with other dis-
plays) the battery needs to be replaced, see page 3 for details.
Timer “O” Key
This key zeros the current displayed timer: Class “B1”, “B2”, Ignition
Ground Timer, or Test Timer. If the TTDJ is in the Test mode, it exits Test.
Test Key
Initiates the Test Timer with 5 minutes. Test mode is indicated by the “3” in
the first digit of the display. Faulted inputs are displayed as in normal opera-
tion, but the system is not shutdown and the Alarm Output is not turned on.
Press “Reset” to reset the fault and press the Timer “O” to exit. The follow-
ing shutdowns override Test: Emergency Shutdown (32), Overspeed (50),
Manual Stop (52), Underspeed (51), Loss of Ignition (51) and Optional
Additional ESD if chosen as ESD. If Class “C” functions are used, they will
need to be bypassed to test other sensors. When exiting “Test” with Class
“C” functions, press “Reset” and “Timer 0” simultaneously.
Shutdown History
The TTDJ models store the last 4 shutdown codes and any alarm present
at shutdown, as well as the elapsed time reading at which they occurred.
For instance, if the unit is shutdown from sensor input 1, the display will
show “01 SD1” to indicate the last shutdown. Shutdown #1 was sensor
input #1. Press the “Up” key for “Shutdown 2”, “3”, “4”, and for any present
“Alarm”. To view the elapsed time reading at which any of the shutdowns
occurred, press “Push To Read Hours” key while viewing that shutdown.
Class “B” Lockout Timer
Allows the system to become fully operational without shutting down by
start-up related conditions. Class “B1” and Class “B2” Sensor inputs are
locked out until their corresponding timer expires. Class “B1” Timer is selec-
table from 0:00-5:00 minutes, and Class “B2” Timer from 0:00-9:59 minutes.
Class “C” Functions
There is a practical limit of sensor inputs defined as Class “C” Shutdown
and/or Class “C” alarm of 8 points. The Class “C” function operation is that
the sensor will be initially faulted on Start-up. If the sensor never clears there
will not be any annunciation and alarm or shutdown. If the sensor clears for a
full 2 seconds, then it is armed to alarm or shutdown. Pressing the Reset key
will allow a Class “C” alarm function to go back to the Start-up state where it
can remain faulted without annunciation and alarm. An example of a Class
“C” function is Low Discharge pressure.
Ignition Ground Delay
This delay is selectable from 0-20 seconds. To select the delay use SETUP.4,
see User Set Up Menus and To Enter User Set Up on page 5.
Hourmeter
The TTDJ internal hourmeter keeps track of Run Hours. To display Run
Hours for 5 seconds, press the Push to Read key. Run Hours are stored
in non-volatile memory, maintaining hours in the absence of power.
RS485 Serial Port
(TTDJ-DC / TTDJ-DC-T)
The RS485 serial port (MODBUS RTU slave) on the back of the module is
provided for communicating with micro-controllers, PC’s, PLC’s and
SCADA systems (see RS485 Typical Connections, below). It is recom-
mended that a termination resistor** (customer supplied) be used on the
first and last device connected in a daisy-chain configuration.
The communication parameters are 9600 baud, no parity, 8 bits with 1 stop
bit (9600,N,8,1), half-duplex. The shield terminal on the TTDJ terminal
block should only be used if the drain wire on the shielded cable is not con-
nected to ground anywhere else. Each device must have a unique RTU node
number. A retry delay of 0.3 second may be helpful (set up for 3 retries).
Modbus Integer Holding Registers
40001= RPM
40002= ETM (elapsed Time Meter 0-65535 Hrs.)
40003= Class B1 (in seconds)
40004= Shutdown Numbers (0=OK) (1-32, 50-52 =SD shutdown)
40005= Output Status (Bit 0= IGN, Bit 1= FV, Bit 2= ALR)
40006= Inputs 1-16 (Bit 0 = TB1..., Bit 15= TB16) (True 1= Inactive)
40007= Inputs 17-32 (Bit 0= TB17.., Bit 15= TB32) (True 1= Inactive)
If 40006 and 40007 both contain “FF” there are no active shutdowns.
RS485 typical connections
TTDJ-99062N page 2 of 8
GENERAL INFORMATION
Continued from page 1
A**
B
SHD
A
B
SHD
B
SHD
TTDJ #N+1
RTU Node #N+1
TTDJ #N
RTU Node #N
Polling Device
MODBUS Master
TTDJ #2
RTU Node #3
Other Device
RTU Node #2
TTDJ #1
RTU Node #1
Polling Device
MODBUS Master
A**
B
SHD
A
B
SHD
A
B
SHD
B
SHD
A**
A**
**
Terminating resistor is 120 ohms
.
Install Terminating resistor at the
master and the last slave. Use only Belden 9841 or 3105A cable or
cabling with a characteristic impedance of 120 ohms.
NOTE:
The common or
Power Supply grounds
between connected
devices must be con-
nected also.
