Nextron MASTERTRACE, Operating Manual

Page: 67 / 110

MASTER TRACE
A.7
Appendix A Display Message
Details - Setpoints
MESSAGE NO: S2-03 APPLIES TO: Selected Heater
DEFAULT VALUE: NONAME VALUE RANGE: 16 Alphanumeric Characters
DISPLAY MODE: Advanced RESTRICTIONS: None
This functions sets the Heater Name. It provides a unique, identifiable tag or label
for each heater circuit. The Heater Name consists of 16 alphanumeric characters
which are entered one at a time from left to right. The cursor indicates which
character is being selected. Press [VALUE
ñ
] or [VALUE
ò
] to change the
character. Move to the next character by pressing [STORE]. Continue in this
fashion until all 16 characters are entered. Press [STORE] in the last character
position to save the Heater Name.
MESSAGE NO: S2-04 APPLIES TO: Selected Heater
DEFAULT VALUE: off VALUE RANGE: on, off
DISPLAY MODE: Advanced RESTRICTIONS: None
This feature sets the response of the heater circuit to the Control Modules Master
Override input. The Master Override input responds to a contact closure. If the
Master Override is set to “off” or the Master Override inputs are shorted, then
control of the heater circuit operates normally based on the Heater Control
Temperature and the Heater Setpoint. If the Master Override is set to “on” and the
Master Override inputs are open, then the heater circuit is opened regardless of the
Heater Control Temperature. This feature allows selected circuits to be turned off
for load shedding or for an ambient temperature override. If the Heater Setpoint is
set to “off” or “none” and the Master Override is set to “on”, then the Master
Override input will have full control over the heater circuit. It means that the heater
will be turned on if the inputs are shorted and off if the inputs are open.
MESSAGE NO: S2-05 APPLIES TO: Selected Heater
DEFAULT VALUE: off VALUE RANGE: on, off
DISPLAY MODE: Advanced RESTRICTIONS: Solid-State Modules
This functions minimizes temperature overshoot and undershoot for tighter
temperature control. For critical temperature maintenance applications more
accurate control can be obtained by using this feature. However, the time to reach
Heater Setpoint may be longer. With Proportional Control set to “on”, as the
Heater Control Temperature approaches the Heater Setpoint, the percent duty
cycle of the heater is reduced. With Proportional Control set to “off”, on-off
control is used.
MESSAGE NO: S2-06 APPLIES TO: Selected Heater
DEFAULT VALUE: 1 C° VALUE RANGE: 0 to 50 C°
DISPLAY MODE: Advanced RESTRICTIONS: Proportional Control must
be “off”
This feature sets the size of the DEADBAND for on-off control. Decreasing the
DEADBAND increases the temperature control accuracy but also increases the
heater switching frequency and wear on mechanical contacts.
MESSAGE NO: S2-07 APPLIES TO: Selected Heater
DEFAULT VALUE: off VALUE RANGE: on, off
DISPLAY MODE: Advanced RESTRICTIONS: None
This function sets the heater fail-safe state. The Control Module detects if the
temperature sensor has failed. In this case it will use only the second RTD input, if
available, or it will set the heater to its fail-safe state. For freeze protection where
there is no hazard from over heating, set to “on” to prevent freeze up. Where there
is a potential hazard from over heating, set to “off”.
HEATER NAME:
NONAME
?
MASTER OVERRIDE:
off
?
PROPORTIONAL
CONTROL: off
?
DEADBAND
1C°
?
IF RTD FAILS
HEATER GOES: off
?