Maxim Integrated 6613_PSU_1+1S_URT_v1_00 - Manual (Page 19)

UG_6613_ 040 6613_PSU_1+1S_URT_V1_00 Firmware Description Document
Rev. 1.0 19
7 MPU Measurement Outputs
This section describes the measurement outputs that can be obtained in Manual CLI Mode. Energy
outputs are accumulated numbers. The host accessing the measurement information from the 78M6613
more frequently than the accumulation interval will not result in any update in the information.
Table 2 lists the wideband measurement outputs.
Table 2: MPU Outputs
Output
Location
(hex)
LSB Comment Example
Delta
Temperature
20 0.1 °C Temperature difference from 22° C.
If external temperature is 32 °C
)20?
Returns:
+10.0
Line
Frequency
21 0.01 Hz Line Frequency
If the line frequency is 60 Hz:
)21?
Returns:
+60.00
Alarm Status 22
Definition for Status Register
Bit 0: Minimum Temperature Alarm.
Bit 1: Maximum Temperature Alarm.
Bit 2: Minimum Frequency Alarm.
Bit 3: Maximum Frequency Alarm.
Bit 4: SAG Voltage Alarm.
Bit 5: MINVA
– under minimum
voltage on VA input.
Bit 6: MAXVA
– over maximum
voltage on VA input.
Bit 7: Reserved.
Bit 8: MAXIA WB
– maximum WB
current exceeded.
Bit 9: Reserved.
Bit 10: Reserved.
Bit 11: PFA negative WB - Power
Factor Negative Threshold Alarm.
Only available if )F2 bit 2 is 1.
Bit 12: PFA positive WB
– Power
Factor Positive Threshold Alarm.
Bits 13 - 20: Reserved.
Bit 21 – CREEP Alert.
Bit 22 - 31: Reserved.
Alarms become “1” when
thresholds exceeded.
Note: Additional Status Alert is
Located at addr 0xBD (see Table 3 )
Note: When AC voltage input is less
than or equal to 10 V
RMS
,
•
Only MINVA alarm is active.
•
All measurements are forced
to 0 except power factor,
which is forced to 1.
Note: The frequency measurement
is forced to 0 as long as the SAG
voltage alarm is active.
Irms A
Overcurrent
Event Count
23
Counter increments on each edge
event.
If four over current events have
occurred:
)23?
Returns: +4