7. Test Descriptions
8. Repeat 4 through 7 for all channels.
Monitor Response to PASS
:
Monitor must be found in fault state for every channel.
LGND/EGND Isolation
Test Description :
Verify that LGND and EGND are NOT shorted together inside of the monitor.
Test Sequence :
No inputs are provided to the monitor. The PCMT tests for a short circuit between the monitor Logic ground and Earth
ground pins.
Monitor Response to PASS
:
Logic ground and Earth ground must not be shorted together in the monitor.
AC Line Brownout
Test Description :
Verify that the monitor can recognize AC line brownout and restore voltages.
Test Sequence :
1. Monitor is powered up in the quiescent state.
2. AC power is set to 100.75 Vrms.
3. fault state is checked.
4. AC power is set to 95.5 Vrms.
5. fault state is checked.
6. AC power is set to 105.5 Vrms.
7. Delay.
8. fault state is checked.
Monitor Response to PASS
:
Monitor must NOT be in fault at (3). Monitor must be in fault at (5). Monitor must NOT be in fault at (8).
NYC AC Power Failure Threshold
NOTE :
This is a special test for New York City type monitors only.
Test Description :
Verify that the monitor low AC line dropout and restore voltages are within the standard limits.
Test Sequence :
1. Monitor is powered up in the quiescent state.
2. Monitor AC line power is at 105Vrms.
3. AC line power is slowly decreased until monitor
is found in the fault state.
4. The AC line dropout voltage is recorded.
5. AC line power is slowly increased until monitor is NOT found in the fault state.
6. The AC line restore voltage is recorded.
7. The difference between the restore and dropout voltage is recorded (hysteresis)
Note :
In step 5 there is a 16.5 second delay after each incremental increase in voltage because of the monitor initial
flash time.
Monitor Response to PASS
:
AC Line dropout voltage must be greater than or equal to 89Vrms and less than or equal to 93Vrms. The AC Line
restore voltage must be greater than or equal to 92Vrms and less than 96Vrms. The hysteresis value between
dropout and restore must be greater than or equal to 1.5Vrms.
PCMT-8000 User's Manual
Rev. 1.7
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