Techtop

GRA0204F-01

20HP, 1800RPM, 575V, 3PH, 256T, Rigid, TEFC

Catalog Number: GRA0204F-01

Specifications

Motor type NEMA Motors General Purpose Three Phase

HP 20

RPM 1800

Voltage 575

Phase 3

Frame 256T

Mounting Rigid

Enclosure TEFC

Material Cast Aluminum

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Electrical Data
Rated Motor Output Power	20 HP
Rated Motor Speed	1770 tr/min
Rated Motor Voltage (+/-10%)	575V
Rated Motor Current	19.10A
Phase	3
Poles	6
Locked Rotor Current @ High Voltage	169.05A
Current Fl @ 208V	-
Service factor	1.25
KVA code	K
Nominal efficiency	93
Rated power factor	0.85
Cables (Qty, Size)	6 \| 12
Frequency	60 Hz
Connection	D
Start capacitor	-
Run capacitor	-
VFD DUTY (S.F. 1.0)	RATIO
Variable Torque	30:1
Constant Torque	15:1
SITE CONDITIONS
Ambient Temperature (℃)	40ºC
Meters Above Sea Level (MASL)	1000

General Data
Frame Size	265T
Enclosure	TEFC
Mounting	Rigid
Number of speeds	-
Approximate weight	244.9 lbs.
Casing Material / Fan Cover	Cast Aluminum	\|	Steel
Shaft Material	1045
NEMA design	A
Degree of protection (IP)	55
Insulation class	F	\|	B
Rotation	Réversible
Service	Continu
Conduit Box Location	F1
Feet Removable / Double Drilled	Yes	\|	No
Paintwork	7024	\|	Graphite Gray
Mechanical Data
Bearing DE Side	6309 ZZ
Bearing ODE Side	62096 ZZ
Grease Type	Mobil Polyrex EM
Compensation Ring (wavy washer)	NDE
Moment of Inertia (lb-ft2)	-
Sound Pressure @ 3 FT dBA	75.6

Features

Removable feet F1, F2, F0 field convertible
1.25 Service Factor with 60Hz operation / 1.0 Service Factor with 50Hz operation
36 Month warranty
Conduit Box is 90º rotatable
Cast aluminum construction with cast aluminum c-flange and cast iron d-flange kits available
Compact lightweight design
CSA Certified for Class I, Division II, Groups A, B, C and D / Class I, Zone 2, Groups IIC, IIB, IIA
Anti-microbial (tropicalization) on stator winding
Shielded bearings
1045 Steel shaft
Surface finish:
- Alkyd enamel RAL7024 - Graphite Gray
- Black oxide surface treatment for increased corrosion resistance
Stainless steel nameplate
Corrosion resistant hardware
Ultra high strength, reusable lifting straps included with motors 254T frame and larger

Operating parameters

Continuous (S1) duty
Ambient temperatures up to 40ºC
Installation up to 1000 MASL (3300 ft.)

Connection

Up to and including 215T Frame:
- 9-Lead 230V parallel-wye / 460V series-wye connection
- 3-Lead 575V wye connection
254T Frame and larger:
- 12-Lead 230V parallel-delta / 460V delta connection
- 6-Lead 460V or 575V single voltage delta connection

Ingress protection

The standard degree of enclosure protection is IP55 (increased IP protection is available). Both drive end and non-drive end are fitted with double lip oil seals, including a rubber shaft slinger on the drive end. Terminal box is double gasketed. DE and NDE end bell fitted with sintered brass one-way drain.

Insulation and inverter rating

Class F Insulation (Impregnation resin, magnet wire and insulation materials are Class H)
Designed to Class B temperature rise
Vacuum Impregnated
Inverter Rated 15:1 Constant Torque, 30:1 Variable Torque (1.0 S.F. on VFD Power)
Exceeds NEMA MG 1 Part 31.4.4.2