6.2 OVERVIEW
The Sullair VSD drive application is custom designed for operation of air compressors. All necessary control functions are performed through the WS Controller keypad and WSPC software. The drive functions as a module on the WS Controller communications bus. WSPC provides detailed information about relevant drive status data and compressor performance. Drive controls are coordinated with internal compressor controls, and with other Supervisor or WS controlled compressors in sequenced systems. The WS Controller monitors drive performance to provide motor thermal and other protections in an easy-to-use, robust design.
WARNING
Before opening the variable speed drive covers: • Disconnect all power to the vari-able speed drive.
• Wait a minimum of 5 (five) minutes after all the lights on the keypad are off. This allows time for the DC bus capacitors to discharge.
• A hazard voltage may still remain in the DC bus capacitors even if the power has been turned off.
Confirm that the capacitors have fully discharged by measuring their voltage using a multimeter set to measure DC voltage. Failure to follow the above precautions may cause death or severe injury.
CAUTION
Do not perform any meggar or voltage with-stand tests on any part of the variable speed drive or its components. Improper testing may result in damage. Prior to any tests or measurements of the motor or the motor cable, disconnect the motor cable at the variable speed drive output terminals (U, VW) to avoid damaging the variable speed drive during motor or cable testing.
CAUTION
Do not touch any components on the circuit boards. Static voltage discharge may dam-age the components.
CAUTION
Install the variable speed drive in a well-ventilated room that is not subject to tem-perature extremes, high humidity, or con-densation, and avoid locations that are directly exposed to sunlight, or have high concentrations of dust, corrosive gas, explosive gas, inflammable gas, grinding fluid mist, etc. Improper installation may result in a fire hazard.
CAUTION
Make sure that no power correction capaci-tors are connected to the variable speed drive output or the motor terminals to pre-vent variable speed drive malfunction and potential damage.
CAUTION
Make sure that the variable speed drive out-put terminals (U, V, W) are not connected to thedrive may occur.
SECTION 6 WS CONTROLLER USER INTERFACE MANUAL
NOTE
ELECTRICAL PREPARATION
Interior electrical wiring is performed at the factory. Required customer wiring is minimal, but should be done by a quali-fied electrician in compliance with OSHA, National Electrical Code, and/or any other applicable State, Federal, and local elec-trical codes concerning isolation
switches, fused disconnects, etc. Sullair provides a wiring diagram for use by the installer.
NOTE
Customer must provide electrical supply power disconnect within sight of
machine.
WS CONTROLLER USER INTERFACE MANUAL SECTION 6
Table 6-1: Cable and Fuse Sizes—460V Ratings
_ UL recognized type RK
Based on a maximum environment of 104°F (40°C)
hp Size (A) Fuse (A)
Wire Size Power
Wire Size Ground
15 23 30 10 10
20 31 35 8 8
25 38 50 6 8
30 46 60 4 8
40 61 80 2 6
50 72 100 2 6
60 87 110 1 6
75 105 125 1/0 4
100 140 175 3/0 2
125 168 200 4/0 1/0
150 205 250 300MCM 2/0
200 261 350 2 x 4/0 3/0
250 300 400 2 x 250MCM 300MCM
300 385 700 2 x 300MCM 300MCM
350 460 1250 2 x 400MCM 400MCM
Table 6-2: Cable and Fuse Sizes—575V Ratings
_ UL recognized type RK
Based on a maximum environment of 104°F (40°C)
hp Size (A) Fuse (A)
Wire Size Power
Wire Size Ground
15 18 30 10 10
20 22 35 8 8
25 27 40 8 8
30 34 45 6 8
40 41 50 2 6
50 52 70 4 6
60 62 80 2 6
75 80 125 1/0 6
100 100 150 2/0 6
125 125 175 3/0 6
150 144 250 300MCM 1/0
200 208 275 350MCM 2/0
250 261 700 2 x 3/0 3/0
300 325 700 2 x 4/0 4/0
SECTION 6 WS CONTROLLER USER INTERFACE MANUAL
6.3 INSTALLATION
The variable speed AC drive has been properly mounted, adjusted, and tested prior to shipment of the compressor package. Inspect the unit to ensure it was not damaged during shipment. The package provides a terminal block for connection of three-phase power and ground. Refer to the package wiring diagram for specific connection information.
All internal wiring to the drive and motors has been provided by the factory, in accordance with the drive's requirements. Do not alter factory wiring. To ensure proper wiring to the package, use the following guidelines:
• Use heat-resistant copper cables only, +75°C or higher.
• The minimum input line cable and line fuses must be sized in accordance with the rated input current of the unit. See Table 6-1 and 6-2.
• Consistent with UL listing requirements, for maxi-mum protection of the variable speed drive, use UL recognized fuses, type RK, suitable for circuits delivering fault currents up to 100,000A.
6.4 WS CONTROLLER DISPLAY AND MENUS
The flow diagram of Figure 6-1 shows the order in which the display messages appear on the WS Controller screen when connected to a VSD machine. As illustrated in the diagram, a press of the ENTER pad when viewing a parameter setting, enables access to change the control parameter value.
Refer to Section 4: Description on page 19 for a general description of the WS Controller displays.
This section addresses special functions applicable to VSD packages.
WS CONTROLLER USER INTERFACE MANUAL SECTION 6
NORMAL VIEW
Compressor Status:
Temperature 1
Compressor Status:
Sump Pressure
Compressor Status:
Line Pressure
Compressor Status:
Separator Pressure Δ Compressor Status:
Run Hours
Compressor Status:
VSD Temperature
Compressor Status:
VSD Capacity
Show Setting
Unload Pressure (ENTER)
Change Setting Unload Pressure
Show Setting Load Delta Pressure
Change Setting Load Delta Pressure
Show Setting VSD Setpoint
Change Setting VSD Setpoint
Show Setting Unload Minutes
Change Setting Unload Minutes
Show Setting Drain Interval Mins.
Change Setting Drain Interval Mins.
Show Setting Drain Time Seconds
Change Setting Drain Time Seconds
Show Setting Wye Delta Seconds
Change Setting Wye Delta Seconds
Show Setting Modulate
Change Setting Modulate
Show Setting Operating Mode
Change Setting Operating Mode
Show Setting Language
Change Setting Language
Figure 6-1: Controller Display Flow Diagram—VSD Compressor