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B R A N C H C I R C U I T M O N I T O R I N G I N S TA L L AT I O N A N D C O M M I S S I O N I N G I N S T R U C T I O N S
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ASPMETER commissioning
7. Branch CT size
Set the size of each CT monitoring the branch circuit
breakers. For the ASPMETER (E30) solid-core products,
the CT size for each branch circuit is automatically set and
locked at 100 amps. For the E31 split-core products, select
the appropriate CT size per channel from the drop-down
menu. If all channels must be set to the same CT size,
the set all channels button may be used for convenience.
8. Voltage alarms
Line-to-line voltage alarms defined
The voltage alarm setup parameters define the alarm delay
(timer) and threshold (limit) for the voltage inputs monitored
by the ASPMETER and E3x (model A and B only). Voltage alarms
are global; settings and alarms are shared between both
panels for main boards with four ribbon cable connections.
The alarm timer settings define the length of time that
a voltage input must be in an alarm state (i.e., exceeds the
overvoltage alarm threshold or falls below the undervoltage
alarm threshold) before activating the latching alarm. A return
to normal (non-alarm) state is instantaneous, so the alarm
timer is reset if the voltage returns to the normal state before
the timer expires. The voltage alarms are always enabled
unless the threshold is set to zero; unlike the current alarms,
there is no on-time delay.
The latching and non-latching voltage alarms share
overvoltage and undervoltage thresholds.
The non-latching voltage alarm is set as soon as the voltage
inputs are in an alarm state (i.e., exceeds the overvoltage alarm
threshold or falls below the undervoltage alarm threshold) and
are cleared as soon as the voltage inputs are out of an alarm
state plus the hysteresis setting (i.e., below the overvoltage
alarm threshold minus hysteresis or exceeds the undervoltage
alarm threshold plus hysteresis).
Overvoltage alarm timer: Enter the number of seconds
the voltage can exceed overvoltage threshold level before
activating the overvoltage latching alarm.
Undervoltage alarm timer: Enter the number of seconds
the voltage can drop below the undervoltage threshold
level before activating the undervoltage latching alarm.
Overvoltage alarm threshold (V): Type the limit for the
overvoltage alarm state in volts. To disable this alarm
(for all voltage inputs), set its threshold value to 0 volts.
Threshold for both latching and non-latching alarm.
Undervoltage alarm threshold (V): Type the limit for the under
voltage alarm state in volts. To disable this alarm (for all
voltage inputs) set its threshold value to 0 volts. Threshold
for both latching and non-latching alarm.
Non-latching alarm hysteresis (%): Type the value, expressed
as a percentage of the alarm threshold, that defines how much
the voltage must fall below the overvoltage threshold or rise
above the undervoltage threshold to determine the alarm's
OFF state.
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