Emerson SZO22, SZV22 Initial Startup Compressor Module, Variable Frequency Drive VFD Terminations

Single-Compressor Module Installation

2.6.6Variable Frequency Drive (VFD) Terminations

Refer to Product Bulletin on Variable Frequency Drive Applications for details on VFD terminations and typical VFD parameters.

3.0Operation

3.1Initial Startup - Compressor Module

The following inspections should be made on initial startup—-typically, by the Packager—and after long periods of storage.

•Verify acceptable pre-startup conditions using the checklist in 3.1.1 - Pre-Startup Checklist.

•Start the Compressor Module, then perform the checks in 3.1.2 - Post-Startup Checklist.

3.1.1Pre-Startup Checklist

Perform these checks BEFORE starting the Compressor Module:

MAIN POWER

Check for the following conditions:

___ 1. Motor type is correct for the application, either Variable Speed C3A or C2A motor.

___ 2. Power phasing to the terminal strip and Compressors is correct.

___ 3. Supply voltage to the Variable Frequency Drive (VFD) or Fixed Speed Compressor motors is correct.

___ 4. All chassis, earth grounds are connected.

___ 5. A load reactor or other approved filter is installed for systems with power lead lengths in excess of 200 ft. (61m) between the VFD and Compressor Module terminal box.

LOW VOLTAGE DEVICES

Verify these conditions for low voltage devices:

___ 1. DC polarity is correct.

___ 2. Temperature control device—if other than standard thermistor control—is working properly.

SAFETY AND CONTROL DEVICES

Make sure that all safety and control switches and devices are configured to inhibit Compressor operation if a fault condition is detected, including:

___ 1. Low inlet pressure switch

___ 2. High discharge pressure switch

___ 3. High temperature switch

___ 4. Variable Frequency Drive (VFD) fault

___ 5. Motor overload trip

___ 6. Other safety and control switches and devices

MECHANICAL SYSTEMS

Inspect for these conditions:

___ 1. (Required) Compressor inlet is protected from water slugging.

___ 2. (Recommended) Gas filtration and treatment is appropriate for the application.

___ 3. Packager configuration applies back pressure to the Compressors.

___ 4. Inlet and discharge valves allow the module to be isolated.

___ 5. All guards and protective covers are installed.

___ 6. Protection from freezing is provided if needed for the application and location.

___ 7. A suitable enclosure providing protection from the elements is appropriate for the application and location.

15 2008SSD-34 (5/11)