Pentair 920 Series Installation, Operating And Maintenance Instructions page 35

INDUSTRIAL HEAT TRACING SOLUTIONS
• If the user resets an alarm while the alarm condition is still exists, the alarm will not be
indicated again until the entire alarm filter time has expired.
3.8.7 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.
alarm mask: ENABLE or DISABLE
range: 20 to 250 mAmps
procedure: If ground-fault tripping is desired, enable the GFI TRIP ALARM and adjust the GF 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.
Caution: In order to implement a ground-fault trip function, all nongrounded power conductors
must be opened upon detec-tion of a ground-fault condition.
Important: National Electrical Codes require that all legs of non-neutral based power sources
be opened upon detection of a ground fault. Multipole switch configurations should be used on
non-neutral based power systems. Check the requirements with your local electrical au-thority.
3.8.8 LoW voLtaGe aLarm
purpose: Alarms voltage levels that are lower than a preset limit for the application.
alarm mask: ENABLE or DISABLE
range: 10 to 330 volts (VOLTAGE TURNS RATIO = 1.00)
procedure: Adjust the LOW VOLTAGE ALARM level to the desired value. The LOW VOLTAGE ALARM
must be enabled to adjust the LOW VOLTAGE ALARM level. Also, 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 1 volt.
See section 3.5.21 on page 26 for more information regarding the VOLTAGE TURNS RATIO.
Important:
• The LOW VOLTAGE ALARM is only available if VOLTAGE SOURCE is set to the Point being used.
• The LOW VOLTAGE ALARM should always be enabled. Since the HTC may be powered from
either of two switch interface modules (assum-ing a dual-point installation), the loss of power on
one circuit will not necessarily be indicated at the alarm output or as a communications failure.
3.8.9 LoW voLtaGe aLarm fILter tIme settInG (v3.11 and up)
purpose: The LOW VOLTAGE ALARM FILTER will prevent LOW VOLTAGE ALARMS from being indicated
until a low voltage condition has existed for the duration of the LOW VOLTAGE ALARM FILTER time.
range: 0 to 12 seconds
procedure: Adjust the LOW VOLTAGE ALARM FILTER time to the desired value. The LOW VOLTAGE
ALARM must be enabled to adjust the LOW VOLTAGE ALARM FILTER time. Also, the LOW VOLTAGE
ALARM FILTER is only available if VOLTAGE SOURCE is set to the Point being used.
Important:
• If an alarm condition appears and then disappears before the alarm filter time has expired, the
filter timer is reset and the alarm condition must exist again for the entire alarm filter time
before the corresponding alarm will be indicated.
• If the user resets an alarm while the alarm condition is still exists, the alarm will not be
indicated again until the entire alarm filter time has expired.
3.8.10 hIGh voLtaGe aLarm
purpose: Alarms voltage levels that are higher than a preset limit for the application. Serves as a
monitor of the voltage used to power the trace circuit.
alarm mask: ENABLE or DISABLE
range: 10 to 330 volts (VOLTAGE TURNS RATIO = 1.00)
procedure: Adjust the HIGH VOLTAGE ALARM level to the desired value. The HIGH VOLTAGE
ALARM must be enabled in order to adjust the HIGH VOLTAGE ALARM level. Also, the HIGH
VOLTAGE ALARM level is affected by the VOLTAGE TURNS RATIO setting. The absolute maximum
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