Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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E.6 Data Communications
1. The RS-485 serial communications port, and
an EEPROM, allows the heater to be part of a
Supervisory Control and Data Acquisition (SCADA)
network and Remote Control and Monitoring System
(RCMS) software.
2. The RS-485 port runs at 9600 baud and allows
communication over long distances of up to 1000’
and possibly longer.
NOTE:
Cable construction: Cat5 24 AWG twisted pair is a very
common cable type used for RS-485 systems. Adding
shielding to the cable enhances noise immunity, and
thereby allows greater distance. If used, connect one
end only of shield to ground.
3. The 8-bit memory address allows a maximum of 254
heaters to connect to the same communications bus.
E.7 Controller EEPROM Memory
1. EEPROM memory chip stores parameters and an address.
2. EEPROMs can be switched between controllers.
In the event a controller needs to be replaced the
EEPROM can be removed from the old and put in the
replacement. The parameters and address remain
with the heater and no RCMS software modifications
are required.
WARNING
WARNING. Electrostatic discharge can damage ICs.
Have qualified personnel remove and install
EEPROM IC.
3. Parameters activated locally or remotely by the RCMS
software are stored on the EEPROM.
NOTE:
There are two parameter types, ‘COMMUNICATION’ and
‘MODE’.
Table 1 – Communication Parameters (Activated Locally)
Name Setting
1
Function
LOCAL AUTO
MODE
1
Disables communications and
enables local EMS control.
REMOTE SCADA
MODE
2
Enables RS-485 MODBUS
communication.
Disables local EMS control.
Enables weather station mode.
DEFAULT ADDRESS 3 Writes 254 to processor address.
2
ADDRESS SET 4 Writes new address to EEPROM.
2
8N1 COM 5
Enables 8N1 communication.
3
Enables local EMS control.
LOCAL EMS,
enabled
6 Enables local EMS control.
LOCAL EMS,
disabled
7 Disables local EMS control.
FAN MODE ----
When enabled, the fan runs
continuously.
4
When disabled, the fan runs only
when heating is requested.
1
Setting number equals alarm LED/relay count.
2
One time functions.
3 The 8N1 configuration allows the heater to send status information only and is
intended to aid service technicians. This configuration does not allow the heater
to be part of a network.
4
See CONTINUOUS FAN MODE section for instructions.
E.8 Activating a COMMUNICATION Parameter
NOTE:
Read and understand the following procedure before
starting. COMMUNICATION parameters require a
hardware programming key to make changes, MODE
parameters do not.
1. Toggle mode selector switch to “OFF”. If installed,
disconnect EMS cable from controller. Plug
programming key into the mating EMS 10-pin
connector. Then the red LED on the key lights.
2. Press the RESET button, and short jumper JP1.
3. Release the RESET button. The RTC, MANUAL,
CYCLING, and AIR SWITCH LEDs will each pulse, one
after the other for one sequence. Then the RUN
indication LED pulses and the green LED on the
programming key alternates on and off.
4. After five RUN indication pulses, the red ALARM LED
lights for 3 seconds. This cycle continues as long as
the jumper, JP1, is shorted.
5. Count the number of times the red ALARM LED lights.
6. Once the count equals the parameter number,
remove the jumper before the ALARM LED turns
off. For example, when the ALARM LED lights for
the second time removing the jumper will activate
REMOTE SCADA MODE, parameter #2.
7. Function performed.
8. Parameter or new address is stored on the EEPROM.
9. Repeat sequence as required to activate other
parameters.
E.9 Mode Parameters
Table 1 – Mode Parameters
Name Parameter
1
Function
FAN MODE
ENABLE
1
Turns the motor on and keeps it
running continuously.
FAN MODE
DISABLE
2
Motor runs only when heater is
requested.
LOCAL EMS
MODE
ENABLE
3 Local EMS controls the heater.
LOCAL EMS
MODE
DISABLE
4
The local EMS will not turn the heater
on.
RAIL
THERMOSTAT
MODE
NORMAL
5
Configures operation to new
thermostat, open when cold, closes
on temperature rise (COR).
RAIL
THERMOSTAT
MODE
REVERSED
6
Configures operation to older rail
thermostats that are closed when
cold, open on temperature rise
(OOR).
1
Parameter number equals alarm LED/relay count.