Help understanding Spindle controls

If I am using Modbus to control my VFD what of the following Hal commands do I need and what can I delete?  
Also am I missing anything?
#*******************
#  SPINDLE
#*******************

setp   pid.s.Pgain     [SPINDLE_0]P
setp   pid.s.Igain     [SPINDLE_0]I
setp   pid.s.Dgain     [SPINDLE_0]D
setp   pid.s.bias      [SPINDLE_0]BIAS
setp   pid.s.FF0       [SPINDLE_0]FF0
setp   pid.s.FF1       [SPINDLE_0]FF1
setp   pid.s.FF2       [SPINDLE_0]FF2
setp   pid.s.deadband  [SPINDLE_0]DEADBAND
setp   pid.s.maxoutput [SPINDLE_0]MAX_OUTPUT
setp   pid.s.error-previous-target true

net spindle-index-enable  =>  pid.s.index-enable
net spindle-enable        =>  pid.s.enable
net spindle-vel-cmd-rpm     => pid.s.command
net spindle-vel-fb-rpm      => pid.s.feedback
net spindle-output        <=  pid.s.output

# ---setup spindle control signals---

net spindle-vel-cmd-rps        <=  spindle.0.speed-out-rps
net spindle-vel-cmd-rps-abs    <=  spindle.0.speed-out-rps-abs
net spindle-vel-cmd-rpm        <=  spindle.0.speed-out
net spindle-vel-cmd-rpm-abs    <=  spindle.0.speed-out-abs
net spindle-on                <=  spindle.0.on
net spindle-cw                 <=  spindle.0.forward
net spindle-ccw                <=  spindle.0.reverse
net spindle-brake              <=  spindle.0.brake
net spindle-revs               =>  spindle.0.revs
net spindle-at-speed           =>  spindle.0.at-speed
net spindle-vel-fb-rps         =>  spindle.0.speed-in
net spindle-index-enable      <=>  spindle.0.index-enable

# ---Setup spindle at speed signals---

sets spindle-at-speed true

@tommylight Is there a way to determine if my version of LinuxCNC has the hy_gt_vfd component installed or how can I reinstall it? 
I have tried everything that I can think of, and it errors out on "loadusr -W hy_gt_vfd -t 1 -d /dev/ttyUSB0 -p none -r 19200"   line in me custom.hal file.  If I use vfdmod it will communicate fine with my VFD but I can't get it to control it.  I am pretty sure I have all the addresses correct and the VFD responds to me clicking the CW or CCW buttons The fan kicks on but no spindle movement.  and no communication errors so I know my usb to RS485 is working. 
 am thinking if I could just get the hy_gt_vfd component to load I may be able to get this thing running again. 
Of if there is no way to update the hy_gt_vfd component is there any way to send commands to the VFD to see if I can command the spindle on?  

Here is my custom.hal commands.

loadusr -W hy_gt_vfd -t 1 -d /dev/ttyUSB0 -p none -r 19200


 setp hy_gt_vfd.spindle-on 1
 
 net spindle-vel-cmd-rpm => hy_gt_vfd.speed-cmd 
 
 net on spindle.0.on => hy_gt_vfd.spindle-on

 net spindle-speed-fb => hy_gt_vfd.speed-fb

 net spindle-at-speed <= hy_gt_vfd.at-speed

Thanks for the information on "man hy_gt_vfd" I was able to confirm that it is installed and found the real error message.  It wanted more information. I had to add the max speed, max and min frequency and then it ran.   
I am sure there is probably a better way to have done this, but This is what I did to make it work. in case anyone else get stuck here.
loadusr -W hy_gt_vfd -t 1 -d /dev/ttyUSB0 -p none -r 19200 -S 18000 -F 300 -f 5

The bad news was the results were the same as I had with vfdmod so both my VFD's are bad.  What is a good brand that I can get a 240v 60hz 4KW in the US that is supported by LinuxCNC over modbus?  The Haunyang rep said my voltage was higher than they expected but it is with in their specification of 220V +/- 15% I have had 2 Hy_GT that have not worked.