37
Caution: In order to implement a ground-fault trip function, all nongrounded power conductors
must be opened upon detection of a ground-fault condition.
Note: 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 authority.
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.
Notes:
• 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 (assuming 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 indi-
cated 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.
Notes:
• 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 indi-
cated 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 adjusted HIGH
VOLTAGE ALARM
level is 1000 volts. The absolute minimum adjusted HIGH VOLTAGE ALARM level
is 1 volt. See section 3.5.21 on page 26 for more information regarding the
VOLTAGE TURNS
RATIO
function.
Note: The HIGH VOLTAGE ALARM is only available if VOLTAGE SOURCE is set to the Point being
used.
To Next Page
Loading...
