Carrier 48/50PD05 manual Appendix B - Vfd Information, 0-10Vdc

APPENDIX B - VFD INFORMATION

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.

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.

Table 39 — VFD TERMINAL DESIGNATIONS

			TERMINAL		FUNCTION
U1
V1
W1				Three	Phase main circuit input power supply
U2
V2				Three	Phase AC output to motor, 0V to maximum input
W2				voltage level
X1---	11	(GND)
X1	12	(COMMON)		Factory	supplied jumper
X1---	10	(24VDC)
X1	13	(DI	1)	Run (factory supplied jumper)
X1---	10	(24VDC)		Start Enable 1 (factory supplied jumper). When opened,---
X1	16	(DI	4)	the drive goes to emergency stop
X1---	2 (AI---		1)
X1	3 (AGND)			Factory wired for 0 10Vdc remote input

0-10Vdc

A48-7712

48/50PD

C08674

Fig. 40 - VFD Wiring

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