Modbus Register List - Greenheck DC Installation, Operation And Maintenance Manual

Modbus Register List

HVLS fan VFDs are configured for Modbus RTU communication as standard. The Modbus register list is for
applications where a building management system (BMS) or field-supplied control are to be used for fan operation.
A baud rate of 19200 bps and a device polling delay of 260 ms are recommended for network functionality.
Register Name
1 Run Command
2 Torque Reference
3 Operational Status
4 Light Control
5 External Temperature
6 Last Fault Code
7 Second Last Fault
8 Third Last Fault
9 Fourth Last Fault
10 Fifth Last Fault
11 Firmware Version
12 Operating Hours
13 Motor RPM
14 Voltage, DC Bus
15 Voltage, Output RMS
16 Current, Motor RMS
17 Temperature, Motor
Temperature,
18
Transistor
19 Temperature, MCU
Thermal Speed
20
Derate
Communication
21
Errors
22 Min Speed
23 Max Speed
24 Biasing
25 -- Spare --
KEEP ALIVE
26
(WatchDog)
MODBUS Serial
27
Speed
28 Motor Type
29 MODBUS Device ID
30 -- Spare --
NOTE: Registers 1000-1150 are reserved for internal Diagnostics and Testing.
®
R/W Retentive Signed Format
R/W x
R/W xxx
R x
R/W xxx
R xxxxx
R R xxx
R R xxx
R R xxx
R R xxx
R R xxx
R R xxxxx
R R xxxxx
R S xxx
R xxx
R xxx
R xx.x
R S xxx.x -300...1100
R S xxx.x -400...1250
R S xxx.x -300...1350
R xxx
R xxx
R/W R xxx
R/W R xxx
R/W R x
R
R/W R xxxxx
R/W x
R/W
R/W R
R/W
Range Default Description
0=Stop=clear Fault(s); 1=Reverse; 2=Forward;
0,1,2
99=Reset
Percentage of full torque. Torque output determines fan
1...100
speed.
1=Comm CRC errors, 2=Drive Faulted, 3=Motor temp
0...6 warning, 4=IGBT temp warning, 5=Drive Inhibited (Fire
Input), 6=Wind Shut Down active
J5 0-10V Output for Optional
0..100 0
Light Control (%)
-400..1100 External Temp (°C) (0.1 unit)
Integer code representing fault
history
1-500 Incremental Version Count
0-65535 Operating hours (driving motor) MAX 65535
-300...300 Motor RPM (0.1 rpm)
0...1000 Bus Voltage (Volts) (1 units)
0...1000 RMS Modulated Output Voltage (Volts) (1 units)
RMS Motor current (Amps)
0...150
(0.1 units)
Motor Temp (°C) (0.1 units)
Transistor Temp (°C) (0.1 units)
MCU Temp (°C) (0.1 units)
Speed/Torque derate based on
0...100
overtemp (%)
Number of errors since last
0-65535
power cycle
0...200 Minimum allowable motor RPM for fan model/size
0...200 Maximum allowable motor RPM for fan model/size
0, 1 0=no bias; 1=680 Ohm pullup/pulldown biasing
0
0-65535 30 Seconds
Baud Rate Setting
0...9 5
(SW2: Pin 7 ON)
0..2 0 13,70,170
New Device ID is set after
1-247 2
power cycle
0
Detail
Resets to 0 after
power cycle
Based off an external
10K @ 25C NTC
thermistor
At each fault
occurrence, values are
shifted to next register
and the current fault
is displayed in Last
Fault Code. Values are
retained after power
cycle.
Transistor to Heatsink
Thermal regulation
(Motor and/or Drive)
0-65535
Any message resets; if
a timeout occurs, fan
will stop (if running)
0 1200 bps
1 2400 bps
2 4800 bps
3 9600 bps
4 19200 bps
5 38400 bps
6 57600 bps
7 115200 bps
0=13; 1 = 70; 2=170
Overhead Ceiling Fans 27