Register
Name
R/W Retentive Signed Format
Range
Default
Description
Detail
Contr
ol
1
Run Command
R/W
x
0,1,2
0=Stop=clear Fault(s); 1= Reverse; 2=Forward; 99=Reset
2
Speed Reference R/W
xxx
1...100
Percentage of full speed/torque
3
Operational Status R
x
0…6
1=Comm CRC errors, 2=Drive Faulted, 3=Motor temp
warning, 4=IGBT temp warning, 5=Drive Inhibited (Fire
Input), 6=Wind Shut Down active
4
Light Control
R/W
xxx
0..100
0
J5 0-10V Output for Optional
Light Control (%)
Resets to 0 after power
cycle
5
External
Temperature
R
xxxxx -400..1100
External Temp (°C) (0.1 unit)
Based off an external
10K @ 25C NTC
thermistor
Fault
6
Last Fault Code
R
R
xxx
Integer code representing
fault history
At each fault occurance,
values are shifted to next
register and the current
fault is displayed in Last
Fault Code. Values are
retained after power
cycle.
7
Second Last Fault
R
R
xxx
8
Third Last Fault
R
R
xxx
9
Fourth Last Fault
R
R
xxx
10
Fifth Last Fault
R
R
xxx
Diagnostics
11
Firmware Version
R
R
xxxxx
1-500
Incremental Version Count
12
Operating Hours
R
R
xxxxx
0-65535
Operating hours (driving
motor)
MAX 65535
13
Motor RPM
R
S
xxx
-300…300
Motor RPM (0.1 rpm)
14
Voltage, DC Bus
R
xxx
0…1000
Bus Voltage (Volts) (1 units)
15
Voltage, Output
RMS
R
xxx
0…1000
RMS Modulated Output Voltage (Volts) (1 units)
16
Current, Motor
RMS
R
xx.x
0…150
RMS Motor current (Amps)
(0.1 units)
17
Temperature,
Motor
R
S
xxx.x -300…1100
Motor Temp (°C) (0.1 units)
18
Temperature,
Transistor
R
S
xxx.x -400…1250
Transistor Temp (°C) (0.1
units)
Transistor to Heatsink
19
Temperature,
MCU
R
S
xxx.x -300…1350
MCU Temp (°C) (0.1 units)
20
Thermal Speed
Derate
R
xxx
0…100
Speed/Torque derate based
on overtemp (%)
Thermal regulation
(Motor and/or Drive)
21
Communication
Errors
R
xxx
0-65535
Number of errors since last
power cycle
0-65535
22
-- Spare --
R
0
23
-- Spare --
R
0
24
-- Spare --
R
0
25
-- Spare --
R
0
Configuration
26
KEEP ALIVE
(WatchDog)
R/W
R
xxxxx
0-65535
30
Seconds
Any message resets; if a
timeout occurs, fan will
stop (if running)
27
MODBUS Serial
Speed
R/W
x
0…9
5
Baud Rate Setting
(SW2: Pin 7 ON)
0
1200 bps
1
2400 bps
2
4800 bps
3
9600 bps
4
19200 bps
5
38400 bps
6
57600 bps
7
115200 bps
28
Motor Type
R/W
0..2
0
13,70,170
0=13; 1 = 70; 2=170
29
MODBUS Device
ID
R/W
R
1-247
2
New Device ID is set after
power cycle
SW2 PIN 8 must be set
(on) for this to take effect
30
-- Spare --
R/W
0
NOTE:
Registers 1000-1150 are reserved for internal Diagnostics and Testing.
Modbus Registers
The VCFI fan’s VFD is configured for Modbus RTU communication as standard. The Modbus register list is for
applications where a building management system or field-supplied control are to be used for fan operation.
High Volume, Low Speed Ceiling Fans
23
