38
Variable Frequency Drives General Information
The VFD should never be used to balance air flow. A jumper is provided that allows the drive to operate at 60Hz. This Jumper should be used to place the drive at its maximum hertz and all other air flow adjustments should be done with the blower sheaves and pulleys. Failure to do so may cause erratic operation of the blower system.
The factory is currently rolling out a sticker that will be placed on the drive to provide the proper settings for the drive.
Until the factory fully implements this procedure it is recommended that anyone connecting a key pad to modify the settings please review one of the following manual.
513 06 2903 01 ICP VFD Manual
Wild Leg Power Supply
Check the power to the unit before startup. A better procedure would be to check power supply to the replacement unit before recommending a VFD unit for replacement. Wild Leg Power Supply requires a field supplied Delta-WYE transformer
This is less common power supply today but does occur in older city areas. Voltage reading look like this.
L1 to ground 120 volts
L2 to ground 240 volts
L3 to ground 120 volts
Note: the higher voltage on one leg with normal voltages on the other 2 legs.
Wild Leg Power Supply
Requires the installation of a Delta-Wye transformer to operate the VFD.
Several bulletins are available on HVAC Partners
National Service Managers Meetings discussing VFD Topics
Parameters
|
Parameter |
Description |
Setting ACS320 |
Setting ACH550 |
|
9802 |
COMM PROT Sel |
Not Selected |
Not Selected |
|
9902 |
Application Macro |
(1) HVAC DEFAULT |
(1) HVAC DEFAULT |
|
9905 |
Motor Nominal Voltage |
See Motor Table |
See Motor Table |
|
9906 |
Motor Nominal Current |
See Motor Table |
See Motor Table |
|
9907 |
Motor Nominal Frequency |
60 HZ |
60 HZ |
|
9908 |
Motor Nominal Speed |
See Motor Table |
See Motor Table |
|
9909 |
Motor Nominal Power |
See Motor Table |
See Motor Table |
|
1001 |
EXT1 Commands |
(1) DI1 |
DI1 |
|
1003 |
Direction |
(1) Forward |
Forward |
|
1102 |
EXT1/EXT2 SEL |
(0) Not Sel |
EXT1 |
|
1103 |
REF 1 Select |
(1) AI1 |
AI1 |
|
1104 |
REF 1 Minimum |
0 HZ |
0.0 HZ 0 RPM |
|
1105 |
REF 1 Maximum |
60 HZ |
60.0 HZ/1500 rpm |
|
1201 |
Constant Speed Select |
(8) DI2 and DI3 Make Sure this is NOT INV |
(8) DI2 and DI3 Make Sure this is NOT INV |
|
1202 |
Constant Speed 1 |
40HZ |
40HZ |
|
1203 |
Constant Speed 2 |
60HZ |
60HZ |
|
1204 |
Constant Speed 3 |
60HZ |
60HZ |
|
1205 |
Constant Speed 4 |
Not Selected |
Not Selected |
|
1301 |
Minimum AI-1 |
20.00% |
20.00% |
|
1302 |
Maximum AI-1 |
100.00% |
100.00% |
|
1401 |
Relay Output 1 |
(16) FLT/ALARM |
Not Selected |
|
1402 |
Relay Output 2 |
Not Selected |
Not Selected |
|
1403 |
Relay Output 3 |
Not Selected |
(16) FLT/Alarm |
|
1501 |
AO1 Content |
Not Selected |
Output Freq |
|
1601 |
RUN Enabled |
Not Selected |
Not Selected |
|
1604 |
Fault Reset Sel |
(0) Keypad |
Keypad |
|
1608 |
Start Enable 1 |
(4) DI4 |
DI4 |
|
1611 |
PARAMETER View |
(3) Long View |
Default (0) |
|
2003 |
Maximum Current |
See Motor Table |
See Motor Table |
|
2007 |
Minimum Frequency |
0.0 HZ |
0.0 HZ |
|
2008 |
Maximum Frequency |
60HZ |
60HZ |
|
2101 |
Start Function |
(1) Auto |
(1) Auto |
|
2102 |
Stop Function |
(1) Coast |
(0) Ramp |
|
2109 |
EM STOP Sel |
(0) Not Sel |
Not Selected |
|
2201 |
ACCEL/DECEL |
(0) Not Sel |
Not Selected |
|
2202 |
Accelerate Time |
30s |
30s |
|
2203 |
Decelerate Time |
30s |
30s |
|
2603 |
IR COMP Volt |
0 volts |
0 Volts |
|
2606 |
Switching Freq |
4 HZ |
4 kHz |
|
2607 |
Switching Freq Control |
(1) ON |
On |
|
3102 |
Trial Time |
300.0s |
30.0s |
|
3103 |
Delay Time |
6.0s |
6.0s |
|
3104 |
AR Overcurrent |
(1) Enabled |
(0) Disabled |
|
3105 |
AR Overvoltage |
(1) Enabled |
(1) Enabled |
|
3106 |
AR Undervoltage |
(1) Enabled |
(1) Enabled |
|
5101 |
FBA Type |
Not Selected |
Not Selected |
|
5201 |
Station ID |
(1) Default |
(1) Default |
|
5202 |
Baud Rate |
9.6 Kbits/s default |
9.6 Kbits/s default |
|
5203 |
Parity |
(0) 8N1-8 default |
(0) 8N1-8 default |
|
5301 |
EFB Protocol ID |
0000 hex default |
0000 hex default |
|
5302 |
EFB Station ID |
1 Default |
1 Default |
|
5303 |
EFB Baud Rate |
9.6 Kbits/s default |
9.6 Kbits/s default |
|
5304 |
EFB Parity |
(0) 8 NONE 1 |
(0) 8 NONE 1 |
|
5305 |
EFB CTRL Profile |
(0) Default |
(0) Default |
Please observe that under ACS320 there are only a few parameters that change those marked as See Motor Table all other parameters are the same for all Electro-Mechanical ACS320 drives. The same is true for the ACH550 Electro-Mechanical drives. These drives are also called Staged Air Volume (SAV). The RED parameters were updated by the factory and are now set in the production process.
Consult one of the Variable Frequency manual to get the SEE MOTOR TABLE Information.
513 06 2903 01 ICP VFD Manual
See EXAMPLE Next Page.
Parameter 1201
Parameter 1201 seems to be a parameter that is often set incorrectly in the field when field programming the drive.
As you can see there are a lot of different choices. The drive should be set for:
If the -8 is selected then the drive will run with not call from the thermostat when you turn on the power to the unit and the drive will shut down when it receives a call from the thermostat. INV=Inverse works just the opposite as expected.
Always check to ensure that INV has not been selected.
