Specifications

Catalog WSC/WDC-4 41
Standard Components
1) Incoming and outgoing power terminals.
2) Transformer to supply power to the control circuit, oil heaters and oil pump.
3) Redundant motor control relays with coils in series.
4) The VFD is current rated at 2 kHz carrier frequency for all 200–1000 HP drives. The drive is
capable of running at 110% of nameplate current continuously and provides a minimum of
150% of this rated current for 5 seconds.
5) The VFD will not generate damaging voltage pulses at the motor terminals when applied
within 500 feet of each other. Both drive and motor comply with NEMA MG1 section
30.40.4.2 which specifies these limits at a maximum peak voltage of 1600 Volts and a
minimum rise time of .1 microseconds.
6) Units drawing 240 amps or less are air-cooled. All others are water-cooled. Factory-mounted
water-cooled VFDs are factory piped to the chiller oil cooling system. Free-standing water-
cooled units require chilled water supply and return piping for the VFD cooling. VFDs have
a liquid-cooled heat sink assembly enabling liquid cooling of the drive through a single inlet
and outlet connection point, dissipating 25,000 BTUs/Hr for 600 HP, 20,000 BTUs/Hr for
450 HP, and 16,000 BTUs/Hr for 350 HP. The cooling circuit maintains water temperature
between 60°F and 104°F (15°C to 40°C)
.
7) The VFD and options are cUL¥ 508 listed. The drive and options are designed to comply
with the applicable requirement of the latest standards of ANSI, NEMA, National Electric
Code NEC, NEPU-70, IEEE 519-1992, FCC Part 15 Subpart J, CE 96.
8) The VFD is functionally tested under motor load. During this load test, the VFD is
monitored for correct phase current, phase voltages, and motor speed. Correct current limit
operation is verified by simulating a motor overload. Verification of proper factory presets
by scrolling through all parameters is performed to check proper microprocessor settings.
The computer port also verifies that the proper factory settings are loaded correctly in the
drive.
9) The VFD has the following basic features:
a) An overload circuit to protect an AC motor operated by the VFD output from extended
overload operation on an inverse time basis. This electronic overload is UL¥ and NEC
recognized as adequate motor protection. No additional hardware such as motor overload
relays or motor thermostats are required.
b) An LED display that digitally indicates:
Frequency output
Voltage output
Current output
Motor RPM
Input kW
Elapsed time
Time-stamped fault indication
DC bus volts
c) The capability of riding though power dips up to 10 seconds without a controller trip,
depending on load and operating condition.
d) RS232 port and Windows® based software for configuration, control, and monitoring.
e) An isolated 0-20mA, 4-20 mA or 0-4, 0-8, 0-10 volt analog speed input follower.
f) An isolated 0-10 V or 4-20 mA output signal proportional to speed or load.