Appendix B - - Startup Data - Carrier 48/50PD05 User Manual

On 48/50PD units, the supply fan speed is controlled by a 3- -phase
VFD. The VFD is located in the supply fan section behind an
indoor fan scroll. The VFD speed is controlled directly by the
ComfortLinkt controls through a 0- -10Vdc signal based on a
space temperature sensor. The VFD has a display, which can be
used for service diagnostics, but setup of the control is to be done
through the scrolling marquee display.
U1
V1
W1
U2
V2
W2
X1--- 11 (GND)
X1--- 12 (COMMON)
X1--- 10 (24VDC)
X1--- 13 (DI--- 1)
X1--- 10 (24VDC)
X1--- 16 (DI--- 4)
X1--- 2 (AI--- 1)
X1--- 3 (AGND)
APPENDIX B - VFD INFORMATION
Table 39 — VFD TERMINAL DESIGNATIONS
TERMINAL
Three--- Phase main circuit input power supply
Three--- Phase AC output to motor, 0V to maximum input
voltage level
Factory--- supplied jumper
Run (factory--- supplied jumper)
Start Enable 1 (factory--- supplied jumper). When opened,
the drive goes to emergency stop
Factory wired for 0--- 10Vdc remote input
0-10Vdc
Fig. 40 - - VFD Wiring
The VFD is powered during normal operation to prevent
condensation from forming on the boards during the off mode and
is stopped by driving the speed to 0 (by sending a 0Vdc signal to
the VFD). The units use ABB VFDs. The interface wiring for the
VFDs is shown in the figure below. The VFD connects to
ComfortLink through a 0- -10Vdc output on the AUX1 board.
Terminal designations are shown in the Terminal Designation table.
Configurations are shown in the VFD Configurations table.
FUNCTION
81
A48-7712
C08674