Urc Ac-pro-ii Instructions

URC AC-PRO-II Instructions

AC-PRO-II® Communications Modbus Register Map

• AC-PRO-II: Registers 7000 – 7019: Output Coils
• 7020 – 7099: Information
• 7107 – 7199: User settings (can be set using Modbus Communications)
• 7100, 7101, 7102, 7104, 7105, 7149, 7150: System settings, set at trip unit only
• 7200 – 7399: Trip History data
• AC-PRO-II: Registers 83 – 324 are “backwards” compatible with existing AC-PRO registers. Exceptions are noted.

Data Types

• OC = Output Coil (write only)
• IR = Information Register (read only)
• HR = Holding Register (read/write). See note 6 at the end of this document. * = future

See the end of the document for Modbus Register Notes.

Table A: AC-PRO-II Modbus Register Map

Communications – Modbus Register Map rev 4.0

future release (Returns a value of 0 when read) Register addresses 7091 – 7099, 7164-7199, 7385-7399, 7480-7899, 7942-7979, 7989-7996, and 8000-8999 are reserved – do not   access, results are undefined

Trip History: Registers for Trips #1 through #8

AC-PRO-II backwards compatible registers

If the AC-PRO-II is installed as a direct replacement of an existing communicating AC-PRO trip unit, the same communications registers can be used to maintain the existing AC-PRO communications capabilities. Note: These registers do not address features and information that is unique to AC-PRO-II. To utilize and communicate all information from AC-PRO-II, see Table A, and the AC-PRO-II Instruction Manual. AC-PRO-II: Registers 83 – 324 are “backwards” compatible with existing AC-PRO registers

Data Types

• OC = Output Coil (write only)
• IR = Information Register (read only)
• HR = Holding Register (read/write) * = future

Table B: AC-PRO-II backwards compatible registers

Modbus Register Notes

1. If “Pickup” setting register = 0, the function is disabled.
2. If Trip History current = 65535A, AC-PRO-II determined RMS current(s) were greater than 12x CT rating, indicating CT saturation is possible, making RMS current readings inaccurate.
3. In Trip History, for Instantaneous trips: If all three phase currents are equal and not greater than 12x CT rating, then the trip occurred too rapidly for the AC-PRO-II to determine accurate current(s). In this case, the three currents reported over Communications will be equal to the Instantaneous or Quick-Trip Instantaneous pickup, whichever was the trip type.
4. See notes in Tables for multipliers. Some of the registers where multipliers apply are: 7114, 7115, all breaker Mechanism times (i.e. 7215), ETC.
5. Register 7159 : If an error occurs when attempting to change settings using Communications, the following error codes will be returned, indicating the related reasons

Setting that was out of range Error Code

• CT_RATING 2000
• CT_SECONDARY 2001
• CT_NEUTRAL_SEC 2002
• FREQUENCY 2003
• BKR_POS_CNT_TYPE 2004
• POWER_DIRECTION 2005
• AUTO_POLARITY_CT 2006
• ROGOWSKI_COIL_SENSITIVITY 2007
• ROGOWSKI_COIL_SENSOR_TYPE 2008
• LT_ENABLED 2010
• LT_PICKUP 2011
• LT_DELAY 2012
• LT_THERM_MEM 2013
• ST_ENABLED 2014
• ST_PICKUP 2015
• ST_DELAY 2016
• ST_I2T 2017
• GF_TYPE 2018
• GF_PICKUP 2019
• GF_DELAY 2020
• GF_SLOPE 2021
• GF_QT_TYPE 2022
• GF_QT_PICKUP 2023
• QT_INST_PICKUP 2024
• INSTANT_ENABLED 2025
• INSTANT_PICKUP 2026
• NOL_ENABLED 2027
• NOL_PICKUP 2028
• NOL_DELAY 2029
• NOL_THERM_MEM 2030
• UV_TRIP_ENABLED 2031
• UV_PICKUP 2032
• UV_DELAY 2033
• OV_TRIP_ENABLED 2034
• OV_PICKUP 2035
• OV_DELAY 2036
• PV_LOSS_ENABLED 2037
• PV_LOSS_DELAY 2038
• NSOV_PICKUP_PERCENT 2039
• SB_THRESHOLD 2043
• FORCED_TRIP_ENABLED 2044
• REMOTE_ENABLED 2045
• POWER_REVERSED 2046
• ALARM_RELAY_TU 2047
• ALARM_RELAY_RIU1 2048
• ALARM_RELAY_RIU2 2049
• QT_SWITCH_ENABLED 2052
• UB_ENABLED 2053
• UB_PICKUP 2054
• UB_DELAY 2055
• DATE_FORMAT 2056
• SAFE_T_CLOSE 2057
• PROGRAMMABLE_RELAY 2058
• ZONE_BLOCK 2059
• LANGUAGE 2060
• NEUTRAL_PROTECTION 2061
• THRESHOLD_PHASE_CT 2062
• THRESHOLD_NEUTRAL_CT 2063

1. Permission for Forced Trip Over Communications and Settings Changes Over Communications must be set at the trip unit. “Settings Changes Over Communications” does NOT need to be enabled to allow writing to the System Time registers. (See note 9 below).
2. KW-hours and KVA-hours max value is 99,999,999. These energy counters rollover to zero after this value is exceeded.
3. If a voltage, current, or power value is “Low”, then the respective register will read zero (0). Refer to the AC-PRO-II Instruction manual for “LOW” values criteria.
4. System clock:
   a. Writing date time setting registers in v1.1 – v1.6 needed to be done in HEX.
   b. Reading all date time registers in v1.1 – v1.6 done in BCD
   c. Writing and Reading all date/time registers in v1.7 and later in BCD.
   System time registers notes and examples: each of the 6 bytes are coded as HEX. That is, if it is October 16 then DAY=
   0x16 and MONTH= 0x10. So register values for 12:30:57 on October 16, 2015 would be:
   7107 = 0x1230
   7108 = 0x5710
   7109 x1615
5. Unless noted otherwise, words are 16-bit unsigned integers. The “high byte” (most significant) is transmitted first.
6. When the CT Rating is set to 200A and below, or 5250A and above, some registers are scaled (divided or multiplied by 10). For range (scaling) adjustments, see register 7103, bits 0, 1, and 2. The registers affected by this scaling are the Currents, all settings Pickups, Trip History Currents, Total Power (KW & KVA). (see Note 14 regarding Neutral and GF currents).
7. Voltage readings: a. If register value = 0, then measured voltage is “LOW” (less than 90V line-to-line). b. If register value = 65535, then AC-PRO-II could not determine/measure the voltage. 13.
8. Scaling of Neutral and GF currents. Firmware V1.1-1.6 : Neutral and GF currents were unscaled. Firmware V1.7 and later : Neutral and GF currents are scaled similar to phase currents (refer to note 11 above).
9. Firmware version 1.9 affected the following registers: a. Line-to-Line voltage registers were added (made active) in v1.9. b. Added GF I5t slope in v1.9.
10. Firmware version 2.0.19 added or affected these registers. Firmware version 2 added the following: a. Added Phase Loss / Reverse Protection feature *** b. Added “Test Mode” for testing convenience. c. Added Line-to-Line Voltage measurement, and removed Line-to-Neutral voltages (for AC-PRO-II with Voltage Divider Module). d. Improved UnderVoltage protection *** e. OverVoltage and UnderVoltage now have dedicated pickup settings and delay settings for both Trip and Alarm features. i. Versions 1.1-1.9: Registers 7135, 7136, 7141, 7142 were used for trip OR alarm settings, because either trip OR alarm could be enabled. ii. Version 2: Trip and Alarm functions now have dedicated registers. f. Added Ground Fault Alarm feature g. Added Ground Fault Test trip function h. Phase Loss / Reverse feature and improved UnderVoltage require AC-PRO-II with VDM rev 2 hardware (‘backfed VDM’), which is present in AC-PRO-II with VDM units shipped 2016 & later i. Added bits 7 and 8 to register 7029 in v2.0.
11. Firmware version 2.0.40 affected these registers
    a. Added commissioned status register 7163
    b. Added Frequency reading register 7069
    c. Added Negative Sequence OV register 7070.
12. Firmware version 4.0.65 affected these registers.
    a. 7006
    b. 7008-7010
    c. 7012
    d. 7029-7031
    e. 7040
    f. 7041
    g. 7071
    h. 7077-7087
    i. 7090
    j. 7103
    k. 7110
    l. 7124
    m. 7151-7158
    n. 7200
    o. 7368
    p. 7369
    q. 7380
    r. 7384
    s. 7400-7409
    t. 7900-7941
13. Registers 7072-7076 are for current readings for special use only. Currents values are provided down to 2% of CT rating. Use caution when using readings below 10% of CT rating, as accuracy is not guaranteed, and these readings may not be accurate.

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References

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