Operation
Metered Values
Metering Menu |
Use the metering menus to monitor circuit breaker current (I), voltage (V), power (P), energy (E) and frequency (F).
Current Levels
| Ia | Instantaneous A phase current |
Maximum measurements can also be reset to zero. Check Current Levels |
| Ib | Instantaneous B phase current | |
| Ic | Instantaneous C phase current | |
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In |
Instantaneous neutral current | |
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Instantaneous ground current | |
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Iamax |
Maximum instantaneous A phase current | |
| Ibmax | Maximum instantaneous B phase current | |
| Icmax | Maximum instantaneous C phase current | |
| Inmax | Maximum instantaneous neutral current | |
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Maximum instantaneous ground current | |
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Voltage is above set maximum | |
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Demand B phase current | |
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Demand C phase current |
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Demand neutral current | |
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Maximum demand A phase current | |
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Maximum demand B phase current | |
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Maximum demand C phase current | |
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Maximum demand neutral current |
Voltage Levels
Check Voltage Levels |
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| Vab | Instantaneous voltage between A and B phases | |
| Vbc | Instantaneous voltage between B and C phases | |
| Vca | Instantaneous voltage between C and A phases | |
| Van | Instantaneous voltage between A phase and neutral | |
| Vbn | Instantaneous voltage between B phase and neutral | |
| Vcn | Instantaneous voltage between C phase and neutral | |
Power Levels
| P | Instantaneous active power |
NOTE: To ensure
reliable power and power factor measurements, Set Power Sign, and Set Sign Convention.
Check Power Levels |
| Q | Instantaneous reactive power | |
| S | Instantaneous apparent power | |
| Power Factor | Instantaneous power factor | |
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Demand active power | |
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Demand reactive power | |
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Demand apparent power | |
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Maximum demand active power | |
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Maximum demand reactive power | |
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Maximum demand apparent power | |
| Maximum measurements can also be reset to zero. |
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Energy Levels
| Total active energy (P) |
NOTE: To ensure
reliable energy measurements, Set Power Sign, and Set Sign Convention.
Check Energy Levels |
| Total reactive energy (Q) | |
| Total apparent energy (S) | |
| Active energy in (E.P.) | |
| Reactive energy in (E.Q.) | |
| Active energy out (E.P.) | |
| Reactive energy out (E.Q.) | |
| Energy measurements
can also be reset to zero. |
Frequency
Check Frequency
Trip Unit History
Use the maintenance menu to review the trip unit history stored in the history logs.
History Log Menu
Trip History
The trip unit stores information about the LSIG fault causing the last ten trips. For each fault the following are stored:
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Current values of Ir, Isd, Ii, and Ig
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Pickup setpoint for voltage and other protection
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Date
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Time (hour, minute and second)
Check Trip History
Alarm History
The trip unit records measurement at each of the last ten alarms activated. For each alarm the following are stored:
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Indication and value of the alarm setting
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Date
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Time (hour, minute and second)
Check Alarm History
Operation Counter
This displays the maximum number of operations (trip or circuit breaker openings) since the circuit breaker was installed. The number is obtained from the circuit breaker communication module (BCM).
Check Operation Counter
Contact Wear
This displays the amount of contact wear on the contact with the greatest wear. When this number reaches 100, it is recommended that a visual inspection of the contacts be done. This function works only on MasterPacT NT and NW circuit breakers.
Check Contact Wear
Protection Setup
Use the protection menus to check protection setup for amperage protection, voltage protection, other protection, current load shedding and power load shedding.
Refer to Appendix B for default settings and setting ranges.
Protection Menu
Amperage Protection
The “Change Idmtl (A) setting with I(A)” screen will only appear if long-time, short-time and/or instantaneous adjustments have been previously made under the Idmtl (A) menu screen. If the user responds Yes, the Idmtl (A) settings will be lost when the menu goes to the I(A) adjustment screen. If no adjustments have been made under the Idmtl (A) menu screen, the menu goes directly to the I(A) adjustment screen.
The “Change I (A) setting with Idmtl(A)” screen will only appear if long-time, short-time and/or instantaneous adjustments have been previously made under the I(A) menu screen. If the user responds Yes, the I(A) settings will be lost when the menu goes to the Idmtl(A) adjustment screen. If no adjustments have been made under the Idmtl(A) menu screen, the menu goes directly to the I(A) adjustment screen.
Check Amperage Protection
Check Amperage Protection
| Circuit Breaker | Neutral CT Type | Protection Choices |
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| All | none | disabled |
| Four-pole | internal | OFF: no neutral protection |
| N/2: half neutral protection | ||
| N: full neutral protection | ||
| Three-pole | external | OFF: no neutral protection |
| N/2: half neutral protection | ||
| N: full neutral protection | ||
| 1.6N: oversized neutral protection |
Check Amperage Protection
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NOTE: To set Inmax, the neutral CT must be set to external
or internal under MicroLogic setup under the maintenance menu.
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Voltage Protection
| NOTICE |
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Hazard of equipment damage
Setting undervoltage protection (Vmin) below 80% or voltage
unbalance (Vunbal) above 20% can cause the trip unit to not perform
as expected.
Failure to follow these instructions can result in equipment damage.
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Voltage protection pickup settings are phase-to-phase values.
Unbalance values are based on the true RMS values of the three-phase currents.
Undervoltage alarm drops out upon the loss of the second phase.
Check Voltage Protection
Other Protection
Check Other Protection
Current Load Shedding
Current load shedding can be configured for alarm only. It cannot be used to trip the circuit breaker.
Check Current Load Shedding
Power Load Shedding
Power load shedding can be configured for alarm only. It cannot be used to trip the circuit breaker.