nvent RAYCHEM T2000 - Page 36

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3.5.12 GROUND FAULT TRIP ALARM
Purpose: This value sets the upper limit of allowable ground fault leakage current. Exceeding
this limit will result in the output switch being latched off and the GFI TRIP ALARM activated to
indicate a ground fault condition. In addition, the three-character display will display “gFI” when
the load current would normally be displayed, and the CURRENT status LED will be flashing
when the TEMP and SETPT status LEDs are illuminated.
Alarm Mask: ENABLE or DISABLE
Range: 20 to 100 mA
Procedure: If ground fault tripping is desired, enable the GFI TRIP ALARM and adjust the G.F.
TRIP CURRENT to the desired value. To disable ground fault tripping, disable the alarm. Note
that the GFI TRIP ALARM must be enabled in order to adjust the G.F. TRIP CURRENT level.
WARNING:
Fire Hazard
A ground-fault alarm may mean the heating cable has been damaged or improperly installed
and must not be ignored. Sustained electrical arcing or fire can result. To minimize the risk
of fire if the alarm has tripped, shut off the power to the heating cable and repair the system
immediately.
IMPORTANT: In order to implement a ground fault trip function, all non-grounded power
conductors must be opened upon detection of a ground fault condition. National Electrical
Codes may require that all legs of non-neutral based power sources be opened upon detection
of a Ground Fault. Multi-pole switch configurations should be used on non-neutral based power
systems. Check the requirements with your local Electrical Authority.
3.5.13 HIGH VOLTAGE ALARM
Purpose: Alarms voltage levels which are higher than a preset limit for the application. Serves
as a monitor of the voltage used to power the heating circuit.
Alarm Mask: ENABLE or DISABLE
Range: 90 to 280 Volts (VOLTAGE TURNS RATIO = 1.00)
Procedure: Adjust the HIGH VOLTAGE ALARM level to the desired value. Note that the
HIGHVOLTAGEALARMmustbeenabledinordertoadjusttheHIGHVOLTAGEALARM
level. Also note that the HIGH VOLTAGE ALARM level is affected by the VOLTAGE TURNS
RATIO setting. The absolute maximum adjusted HIGH VOLTAGE ALARM level is 1000 Volts.
TheabsoluteminimumadjustedHIGHVOLTAGEALARMlevelis9Volts.SeeSection3.4.13for
more information regarding the VOLTAGE TURNS RATIO function.
3.5.14 LOW VOLTAGE ALARM
Purpose: Alarms voltage levels, which are lower than a preset limit for the application.
Alarm Mask: ENABLE or DISABLE
Range: 90 to 280 Volts (VOLTAGE TURNS RATIO = 1.00)
Procedure: Adjust the LOW VOLTAGE ALARM level to the desired value. Note that the
LOWVOLTAGEALARMmustbeenabledinordertoadjusttheLOWVOLTAGEALARM
level. Also note that the LOW VOLTAGE ALARM level is affected by the VOLTAGE TURNS
RATIO setting. The absolute maximum adjusted LOW VOLTAGE ALARM level is 1000 Volts.
TheabsoluteminimumadjustedLOWVOLTAGEALARMlevelis9Volts.SeeSection3.4.13for
more information regarding the VOLTAGE TURNS RATIO function.
IMPORTANT: It is recommended that the LOW VOLTAGE ALARM always be enabled.
3.5.15 OVERCURRENT TRIP ALARM (SSR ONLY)
Purpose: If a control module is not configured as an ATC SLAVE, the overcurrent trip feature is
always enabled when using proportional or proportional ambient SSR control modes with an
SSR output switch. This feature is used to provide protection for the output switch. Enabling
this alarm will only inform the user of an excessively high current condition and that the output
switch has been latched off. During a high current condition, the control module attempts
to soft start a heating cable using a technique involving measured in-rush current and the
SWITCH CURRENT RATING. If the control module is unable to start the cable, it will eventually
trip its output switch off and will not retry or pulse its output switch again. At this point the