Overload Relay Heater Tables

Transcription

1 Overload Relay Tables of Elements for Overload Relays General Use only when motor full load current is not known. Motor amps will vary depending on the type and manufacturer of the motor. These average values, for motors with service factor of.5, are to be used only as a guide. The formulas at the bottom of the page may be used to obtain approximate amps for other motors. Note: RPM shown for 60 cycle motors. For 50 cycle motors, multiply RPM by Phase Full Load Current (60Hz) 50 Hz Syn Speed Hp RPM Volts Volts Volts Volts Volts CAUTION: Actual motor amps may be higher or lower than the values listed below for a particular motor. For more reliable motor protection, select heater elements by using the full load motor nameplate amps. Single Phase motor full load amps of the same horsepower, voltage and speed vary over wide ranges. The following table conforms with table of the NEC. 3 Phase -Phase Full Load Current (60Hz) Hp 5 Volts 230 Volts Full Load Current (60Hz) 50 Hz Syn Speed Hp RPM Volts Volts Volts Volts Volts Formula Approximate for Other Motors 208 Volt Full Load Amp 230 Volt current 0% 2 Phase FLA the 3 Phase FLA 2 Phase, 3 wire current in common wire.4 that in the other 2 lines 25Hz 500 RPM, amps amps of 60Hz, 3600 RPM 25Hz 750 RPM, amps amps of 60Hz, 800 RPM Service factor.0 amps C 55 C motor amps 0.9 6/28

2 Overload Relay Tables of Elements for Overload Relays General To Select Catalog Number Use Product Class Controller Size Motor Amp Phase Enclosure Catalog No 4 C P 3 2 B C 8 Enclosure Phase Size Class. Find heater table number below, using the Product Class, Type of Enclosure and Controller Size. table number is found in the column under the type of overload and phase. 2. Refer to the specified table and use the controller size and motor amps to select the heater catalog number. a. If motor amps are not known, an approximate value may be found on the previous page. These values should be used with caution and only when motor amps are not available. s shown on the following pages provide a maximum trip rating of 25% of minimum motor amperes for 40 C motors (service factor.5). For other motors (service factor.0), select the next lower listed heater catalog number within the designated table which provides a maximum trip rating of approximately 5%. Overload relays do not provide protection against short circuits. To ensure proper coordination with short circuit protective device, select heaters from the information packaged with the control device. Table Number Bimetal Standard Trip (Class 20) Bimetal Quick Trip (Class 0) Compensated Compensated E s K s Size Controller Green Reset Green Reset or Size Class Description Amperage Letter Ph 3Ph Ph 3Ph SMF Manual All See Page 6/30 Magnetic 4, 22 Non-reversing, 00-4 B J Reversing 7, 8 Combination 25, 26 Reversing Combination 30, 32 Multi Speed 89 Motor Control Centers 48 Panel Mounted Overload Relay All All A D J ESP00 starters do not require heater elements. Overload Relay Multi-Speed Each speed requires a separate set of overloads. The adjustment range must be selected on the basis of the full-load current for each particular speed. 6/29

3 Manual Control Elements, Class SMF General Ordering Information Elements Class SMF. Determine number of heater elements required from Table A. 2. Determine motor full load current and service factor. NOTE: If motor amps are unknown, an approximate value may be found on page 6/28. These values should be used with caution and only when motor amps are not available. 3. If the motor and controller are in the same ambient temperature: a. For.5 to.25 service factor motors use 00% of motor full load current for heater element selection. b. For.0 service factor motors use 90% of motor full load current for heater element selection. 4. If the motor and controller are in different ambient temperatures multiply motor full load current by the multiplier in Table B. Use the resultant full load current for heater element selection. 5. Select proper heater element from table below. 6. All tables are based on the operation of the motor and controller in the same ambient temperature, 40 C (04 F) or less. Always be certain the correct heater element is installed in the starter before operating the motor. Motor Full-Load Catalog No Current (Amps) Price $ SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH Table A Number of Elements Number of Device Elements Notes SMFF* SMFF*2 All single pole and two pole SMF SMFF*3 starters require only SMFF*4 Element. SMFF*5 SMFF*6 SMFF*22 Duplex Unit. One Element 2 SMFF*44 per starter. SMFF* Two Speed Starter. One 2 SMFF*22 Element per speed. Motor Full-Load Catalog No Current (Amps) Price $ SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH SMFH Table B Special Applications Element Continuous Duty Motor Service Factor Ambient Temperature of Motor Constant 0 C Constant 0 C Same as (8 F) Higher (8 F) Lower Controller Than Controller Than Controller Ambient Ambient Ambient Full Load Current Multiplier.5 to /30 Discount Code: Manual Starters

4 Overload Relay Tables Full Load Motor Amps, Single Phase, Trip Class 20 Tables 23, 26 Table 23 for Class 4, 22 Size 00, 0, Size P Size 2, 2 2 Catalog No E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E76 Table 26 for Class 48 48DA, 48GA 48HA 48JA Catalog No E E E E E E E E E E E E E7.0.0 E8 E9..2 E E E E E E E E E E E E E E E E E E E E E E E E E E E E E57 E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E07 Discount Code: NEMA Control 6/3

5 Overload Relay Tables Full Load Motor Amps, 3 Phase, Trip Class 20 Tables 233, 238 Table 233 for Class 7, 8, 25, 26, 30, 32 Size 00, 0, Size 3 4 Size 2, 2 2 Size 3, 3 2 Size 4 Catalog No E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E73A E E E E E E80 E E E E E E E E E E E0 E E E04 Table 238 for Class 48 48DC 48GC 48HA 48JA Catalog No E E E E E E E E E E E E E E E9.0.0 E E E E E E E E E E E E E E E E E E E E E E E E E53 E E E E E E E E E E E E E E E E73A E E E E E E E E E E E E E E E E E E E E E E07 6/32 Discount Code: NEMA Control

6 Overload Relay Tables Full Load Motor Amps, Single Phase, Trip Class 0 Tables 33, 36 Table 33 for Class 4, 22 Size 00, 0, Size P Size 2, 2 2 Catalog No K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K76 Table 36 for Class 48 48DA 48GA 48HA 48JA Catalog No K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K96 Discount Code: NEMA Control 6/33

7 Overload Relay Tables Full Load Motor Amps, 3 Phase, Trip Class 0 Tables 332, 335 Table 332 for Class 7, 8, 25, 26, 30, 32 Size 00, 0, Size 3 4 Size 2, 2 2 Size 3, 3 2 Size 4 Catalog No K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K92 K94 K96 Table 335 for Class 48 48DC 48GC 48HA 48JA Catalog No K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K96 6/34 Discount Code: NEMA Control