Emerson SZO56, SZO44 Electrical Requirements, Typical Compressor Module power supply requirements

Dual-Compressor Module Installation

2.6.4Electrical Requirements

Figure 11 Typical Compressor Module Electrical Requirements

	1	1	1
		Optionallifmorethanone
		compressorComoduleModuleused
	4		2
5	5
			3
Power		24VDC	24V Discrete Inputs
to Compressors		Cooling
			from Scroll Module
	(2)	Fan

Code Description

1Control Techniques VFD,* 30 HP

224VDC power supply **

3PLC or other control for inputs from Compressor Module

4480V 3-phase input ***

5Overload protection device, 2 required

Notes

*VFD on Variable Speed Drive models.

**All other components supplied by Packagers.

***Contact factory for information about single-phase applications.

Table 2	Typical Compressor Module power supply requirements
	Compressor Power (data based on 480VAC)	Variable Speed
Module horsepower		30 HP
VFD voltage supply range		342-528VAC
Phase		3-phase*
Frequency		50/60 Hz
Maximum VFD input current		37A
Low Voltage DC Specifications - Oil Cooler Fan Voltage and Power
Fan motor voltage		24VDC
Total fan motor current		9A

Additional power may be required to support customer logic and control circuits.

*Contact factory for information about single-phase applications.

**Reduced capacity at 50 Hz.

13 2006SSD-75 R4 (10/10)