Variable Frequency Drive (Vfd) - Carrier 48/50PD05 User Manual

Variable Frequency Drive (VFD)

The VFD varies the frequency of the AC voltage supplied to the
indoor fan. (See Fig. 20 and Table 23.) This causes the variance in
the speed of the fan. The commanded fan speed is received by the
VFD from the AUX1 board as a 2- -10vdc signal.
The AI1 DIP switch must be in the off (or towards "U") position to
properly read the analog signal. There are three jumper wires that
must remain installed for proper operation. The VFD is mounted
behind the fan housing on the fan sled and the remote keypad is
mounted on the front of the fan housing for easy access. The VFD
is factory set to the auto mode for unit operation.
DISPLAY NAME
Shielded Cable Ground
F.SPD Commanded Fan Speed
Analog Input 1 Common
Low Voltage Power (jumped to DI1 & DI4)
Low Voltage Common (jumped to DCOM)
Discrete Inputs Common (jumped from GND)
Discrete Input 1 (jumped from 24v)
Discrete Input 4 (jumped from 24v)
Voltage Leg from IFC --- 21
Voltage Leg from IFC --- 22
Voltage Leg from IFC --- 23
Voltage Leg to IFM--- 3
Voltage Leg to IFM--- 2
Voltage Leg to IFM--- 1
* Requires the Al1 dip switch to be in in the Off (or towards "U") position.
Table 23 — VFD Connections
POINT DESCRIPTION
LOW VOLTAGE INPUTS
HIGH VOLTAGE
Fig. 20 - - Variable Frequency Drive (VFD)
TYPE OF I/O
Shield
2--- 10vdc
Ground
24v
Ground
Ground
Switch Input
Switch Input
Voltage Input
Voltage Input
Voltage Input
Voltage Output
Voltage Output
Voltage Output
53
C09146
TERMINAL TERMINAL
NUMBER NAME
1 SCR
2 AI1*
3 AGND
10 24v
11 GND
12 DCOM
13 DI1
16 DI4
U1 MAINS
V1 MAINS
W1 MAINS
U2 MOTOR
V2 MOTOR
W2 MOTOR