Nextron MASTERTRACE, Руководство по эксплуатации

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2.4
MASTER TRACE Chapter 2 Getting Started
Use the [VALUE
×
] key to select the next heater 1-2 Now
press [STORE]. All the heater setpoints and measured val-
ues displayed will pertain to heater 1-2.
Assuming that each heater will be completely programmed
before moving on to the next heater, press [MESSAGE
Ø ]
after each setpoint to access the next setpoint. Hold the
[VALUE
× ] key down until the word OFF appears to defeat
any setpoint not required. For example, if a high current
alarm is not useful set the alarm setting to off. Information
about how to select each setpoint will be found in
Chapter
5: OPERATION
. A detailed description of each message is
found in
Appendix A
. Consult these sections for an expla-
nation of how to use each feature.
Setpoints entered in the groups “operating values” and
“heater setup” apply only to the current heater address
selected. Setpoints entered in the group “system setup”
apply to all heaters controlled by the module. Since each
module saves its setpoints independently, it is possible to
inadvertently program modules with different system infor-
mation. Ensure that each module is separately programmed
with the same system setup information ( e.g.. Cost per kilo-
watt hour ) for consistent operation of a system with more
than one control module.
2.4 Test Heater & Alarms
Heater and alarm outputs can be forced on using the test
mode. Like setpoints, this mode requires that the PROGRAM
ENABLE dip switch be set to ENABLE or when you try to
store a test value a message will flash:
NOT STORED -
PROG DISABLED
2.4.1 Heater Test: To test operation of a heater press the
[SETPOINT] key 4 times and [MESSAGE
Ø ] until the fol-
lowing message is displayed:
MANUAL HEATER
DISABLED
"
Use the [VALUE × ] or [VALUE Ø ] keys to set the ON time
in hours. The range is DISABLED/1-24 hours/ON-CON-
TINUOUSLY. To turn on the heater for one hour, press
[VALUE × ] to display ‘1 hour’ then press [STORE]. The
heater will be energized no matter what the heater tempera-
ture setpoint is unless there is a ground fault trip. After the
selected time period the heater will automatically go off.
While the heater is on, the front panel HEATER ON indica-
tor will be illuminated. To override the test mode, press
[VALUE
Ø ] until
DISABLE
appears and then store this
value. Holding the [VALUE × ] key until the word
ON CON-
TINUOUSLY
appears leaves the heater always ener-
gized until the Master Trace™ control is manually powered
off or until this setpoint is set to
DISABLE
. Consequently,
selecting a value of
ON CONTINUOUSLY
should be used
with caution since it overrides normal control operation and
could lead to excessive heating or waste power if acciden-
tally left on. A warning message will appear in the status
mode whenever a heater or alarm is forced on.
With the heater forced on, verify that the expected current
is flowing using the actual current message for that heater
in the measured group. A clamp-on ammeter atteched to one
of the heater wires can be used to compare readings. With
proportional control selected the readings may differ due to
harmonics in the current waveform. Repeat this process for
each heater on the system. As a safeguard, the heater will
automatically timeout after the selected time and go back to
automatic operation.
2.4.3 Alarm Test: The manual alarms setpoint works exactly
like the manual heaters setpoint except that it energizes the
output alarm and indicator. This setpoint is useful for com-
missioning a new system or checking alarm circuits. Nor-
mally this setpoint will be DISABLED.
2.5 Monitor System Status
Now that the Master Trace™ control has been programmed
for a specific application, system status can be checked. If
no keys are pressed for the time specified in DISPLAY
TIMEOUT in setpoints-system setup group of messages,
the display will automatically go into the default message
mode. In the System Status mode, the display will show any
alarms on the system. If desired this could be changed to a
specific message later by reprogramming the default mes-
sage.
Measured values are accessed using the [MEASURED
VALUES] key. These are divided into 2 groups. Pressing
[MEASURED VALUES] once accesses the group of mes-
sages that show current values of temperature current etc.
Pressing the [MEASURED VALUES] key twice will display
the statistics data such as minimum/maximum temperature,
power consumption, running hours etc. Unlike setpoints,
measured values cannot be changed using the [VALUE
×
]
, [VALUE
Ø
] or [STORE] keys.
Note: A summary of all measured messages is provided in
Appendix B . Press the [MEASURED] key and [MESSAGE
Ø
] to view each measured value for the selected heater.