19
Fig 3.1 DigiTrace 920 front panel
3.2 Front Panel Features
Front panel features of the heat trace controller are shown in Figure 3.1. The remainder of this
Section describes the front panel status and display
LEDs.
3.2.1 920 FRONT PANEL DISPLAY
The basic 920 series control module front panel includes seven
LED indicators. Four of these are
used to indicate the “Output” and “Alarm” status of control points A and B.
Status LEDs
OUTPUT The OUTPUT LED, when illuminated steadily, indicates that the output of the controller is
turned on and is allowing current to flow in the trace circuit. For
SSR versions, a flashing LED
indicates that the controller is pulsing its output on and off to maintain the setpoint temperature
and/or control the average amount of current/power the tracer uses. A separate
LED is provided
for Point A and Point B.
ALARM The ALARM LEDs will flash (approximately once per second) when the controller has
detected an alarm condition. A separate
LED is provided for Point A and Point B.
TRANSMIT The TRANSMIT LED (“Tx”) flashes when the controller is sending information over its
communications port to another device. This
LED is only used when an optional communications
interface is installed.
RECEIVE The “RECEIVE” LED (“Rx”) flashes when the controller is receiving information over its
communications port from another device. This
LED is only used when an optional communica-
tions interface is installed.
POWER Indicates the module is powered on.
Note: Older versions of the controller may not have this LED.
3.3 920 Operator Console Display
The optional 920 Operator Console provides a menu-driven, alphanumeric interface to ease con-
figuration and troubleshooting. The following features are part of the controller’s programming,
but are only used in conjunction with the 920 Operator Console. For a detailed description of
each of the console features and operating instructions, refer to the separate DigiTrace 920
Series HTC Operator Console—Installation and Operating Instructions (Tyco Thermal Controls
reference H56903).
PROGRAMMABLE DUAL POINT
HEAT TRACING CONTROLLER
CONSOLE INTERFACE
920 SERIES
POWER
TRANSMIT
RECEIVE
ADDRESS
ALARM
“Power On” LED
Communications status
indicators
Alarm status
indicators
AB
OUTPUT
A - 20910
B - 20911
Output status
indicators
Operator
console
connection
Communications addresses
for Control Point A and
Control Point B
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