Compressor Module Motor Protection; Figure 10 Motor Control - Emerson Copeland Scroll SZV32 Installation, Operation & Maintenance Manual

Dual-Compressor Module

2.6.3 Compressor Module Motor Protection

Variable Speed Compressor Module Protection
• The two Compressors in the variable speed Compressor Module should be treated as a single
Compressor. Both Compressors must be run at the same time to prevent oil from accumulating in
one Compressor. Module capacity can be changed by varying the typical Compressor speed, ranging
from 2400 to 4800 rpm.
• If two or more Compressor Modules are used together, each module can be considered as one
Compressor and individual modules can be turned off.
• Each Compressor on a variable speed Compressor Module requires independent overload protection
between the VFD and Compressor. See 2.6.1 on page 10.

Figure 10 Motor Control

Compressor 1
480VAC
Variable Speed
Variable
Frequency
Drive
Drive Inhibit
OL1 OL2
Compressor 2
480VAC
Fixed Speed
MS1
OL1
Compressor 1 Compressor 2
12
Installation
MS 1 & 2 Inhibit
MS2
OL2
2006SSD-75 R4 (10/10)