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A S P M E T E R C O M M I S S I O N I N G
—
ASPMETER commissioning
Latching alarm examples
Amps
14
12
1.5
1
2
3
0.5
Latching
alarm ON time
alarm ON time
Example 1
1. Current rises above LL (low-low alarm threshold) —
this starts the latching alarm ON timer.
2. Current drops below LL before the latching alarm
ON time period ends, so alarming is not enabled.
The latching alarm ON timer is reset.
3. Current rises above LL — this starts the latching
alarm ON timer.
4. Current remains above the low-low alarm threshold,
beyond the time period specified by the latching alarm
ON time setting — this enables the latching alarm
(all latching alarms for the specific channel are armed).
5. Current rises above H (high alarm threshold) — this
starts the high alarm delay timer.
6. Current rises above HH (high-high alarm threshold) —
this starts the high-high alarm delay timer.
7. Current drops below HH before the high-high alarm
delay period ends, so the high-high alarm delay timer
is reset.
8. High alarm is latched at the end of the high alarm delay
time period.
6
7
HH
8
5
H
4
L
LL
Time
High
alarm delay
High-High
alarm delay
Amps
14
12
2
1.5
1
0.5
Latching
alarm ON time
Example 2
1. Current rises above LL (low-low alarm threshold) —
this starts the latching alarm ON timer.
2. Current remains above LL, beyond the time period
specified by the latching alarm ON time setting — this
enables the latching alarms (all latching alarms are armed).
3. Current drops below L (low alarm threshold) — this starts
the low alarm delay timer.
4. Current drops below LL (low-low alarm threshold) — this
starts the low-low alarm delay timer and the latching alarm
delay timer.
Note: When the circuit current is continuously below the
low-low alarm threshold (%) setting for the duration of the
latching alarm OFF time period (and longer), the latching
alarms for that channel are disarmed. At this point, the
latched alarming feature is disabled (i.e., alarms disarmed),
even though the low, low-low and latching alarms are
latched.
5. Low alarm is latched at the end of the L delay (low alarm
delay) time period.
6. Low-low alarm is latched at the end of the L-L delay
(low-low alarm delay) time period.
7. Current remains below the low-low alarm threshold,
beyond the time period specified in the latching alarm
OFF time setting, thus setting the latching alarm OFF
register for that channel.
39
HH
H
3
L
4
LL
5
6
7
Time
L delay
LL delay
Latching alarm
OFF time
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