CHAPTER 5 LONWORKS COMMUNICATION FUNCTION
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5.3.3 Drive Current (SNVT_amp nvoDrvCurnt)
This output network variable provides the drive output current in Amps.
5.3.4 Drive Speed (SNVT_level_percent nvoDrvSpeed)
This output network variable provides the speed of the drive as a percentage of the nominal speed. Since
nominal speed and nominal frequncy are tightly connected to eachother, the out value is calculated on the
nominal (base) frequency and the running (out) frequency. This output network variable is used as a
heartbeat to monitor the health of the LonWorks communication interface. See chapter 5.3.1 about
heartbeats.
Scaling:
If value of present running is forward then run_dir will be1.
If value of present running is reverse then run_dir will be -1.
BASE_FREQ / ((raw data format)OUT_FREQ / 1000) * (run_dir) = nvoDrvSpeed
5.3.5 Drive Power (SNVT_power_kilo nvoDrvPwr)
This output network variable provides the drive power in kilowatts.
5.3.6 Drive voltage (SNVT_volt nvoDrvVolt)
This output network variable provides the drive voltage in volts.
5.3.7 Output Frequency (SNVT_freq_hz nvoFreqAct)
Output frequency in Hz. Always positive, i.e. no information about direction of revolution (forward/reverse).
5.3.8 Operation Hour Counter (SNVT_time_hour nvoDrvRunHours)
Total power on time in whole hours.
5.3.9 Parameter value out (SNVT_count_inc nvoParam)
Used as feedback variable for generic parameter requests. See nciRdAdr (chapter 5.3.13), nciWriAdr
(chapter 5.3.11) and nciWriValue (chapter 5.3.12).
5.3.10 Emergency Status (SNVT_hvac_emerg nvoEmergStatus)
It indicates emergency stop status. Emergency stop state (nvoEmergStatus) is indicated as
EMERG_SHUTDOWN while emergency stop command (nviEmergOverride) is EMERG_SHUTDOWN.
Value
Definition
Contents
Support
0
EMERG_NORMAL
No emergency mode
Yes
1
EMERG_PRESSURIZE
Emergency pressurize
No
2
EMERG_DEPRESSURIZE
Emergency depressurize
No
3
EMERG_PURGE
Emergency purge mode
No
4
EMERG_SHUTDOWN
Emergency shutdown
Yes
5
EMERG_FIRE
−
No
0xFF
EMERG_NUL
Value not available
No
5.3.11 Drive Alarm (SNVT_switch nvoDrvAlarm)
5.3.12 Drive Warning (SNVT_switch nvoDrvWarning)
It is defined as Drive Alarm: when an inverter trip occurs, Drive Warning: when an inverter warning occurs,
and then output the warning state.
NvoDrvAlarm
nvoDrvWarning
Trip
Warning
State
value
state
value
Contents
Yes
No
1
100(%)
0
0(%)
Drive Alarm
No
Yes
0
0(%)
1
100(%)
Drive Warning
Yes
Yes
1
100(%)
1
100(%)
Drive Alarm and Warning
No
No
0
0(%)
0
0(%)
No warning
