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ELECTRICAL DATA (cont)
524A-B,C ALTERNATE MOTORS
LEGEND
*Motors are designed for satisfactory operation within 10% of nominal
voltages shown. Voltages should not exceed the limits shown in the
Voltage Limits column.
NOTES:
1. Minimum circuit amps (MCA) and MOCP values are calculated in
accordance with NEC (National Electrical Code) Article 440.
2. Motor FLA values are established in accordance with UL (Under-
writers’ Laboratories) Standard 1995.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage
is greater than 2%
. Use the following formula to determine the per-
centage of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 393 v
BC = 403 v
AC = 396 v
= 397
Determine maximum deviation from average voltage.
(AB) 397 – 393 = 4v
(BC) 403 – 397 = 6v
(AC) 397 – 396 = 1v
Maximum deviation is 6 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.5%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
UNIT
524A-B
524A-C
V*-PH-Hz
VOLTAGE
LIMITS
FAN MOTOR POWER SUPPLY
Hp (kW) FLA
Minimum Circuit
Amps
MOCP
072
208/230-1-60 187-253 2.4 (1.79) 11.0 13.8 20
208/230-3-60 187-253 2.9 (2.16) 7.5 9.4 15
460-3-60 414-506 2.9 (2.16) 3.4 4.3 15
575-3-60 518-632 2.0 (1.49) 2.3 2.9 15
090
208/230-1-60 187-253 2.4 (1.79) 11.0 13.8 15
208/230-3-60 187-253 2.9 (2.16) 7.5 9.4 15
460-3-60 414-506 2.9 (2.16) 3.4 4.3 15
575-3-60 518-632 3.0 (2.24) 3.8 4.8 15
120
208/230-3-60 187-253 3.7 (2.76) 10.2 12.8 20
460-3-60 414-506 3.7 (2.76) 4.8 6.0 15
575-3-60 518-632 3.0 (2.24) 3.8 4.8 15
150
208/230-3-60 187-253 3.7 (2.76) 10.2 12.7 20
460-3-60 414-506 3.7 (2.76) 4.8 6.0 15
575-3-60 518-632 5.0 (3.73) 5.1 6.4 15
180
208/230-3-60 187-253 5.0 (3.73) 14.6/12.8 18.3/16.0 30/25
460-3-60 414-506 5.0 (3.73) 6.4 8.0 15
575-3-60 518-632 5.0 (3.73) 5.1 6.4 15
240
208/230-3-60 187-253 7.5 (5.59) 21.5/19.4 26.9/24.3 45/40
460-3-60 414-506 7.5 (5.59) 9.7 12.1 20
575-3-60 518-632 7.5 (5.59) 7.8 9.8 15
300
208/230-3-60 187-253 10.0 (7.46) 28.2/26.8 35.3/33.5 60/60
460-3-60 414-506 10.0 (7.46) 13.4 16.8 30
575-3-60 518-632 10.0 (7.46) 10.3 12.9 20
FLA — Full Load Amps
MOCP — Maximum Overcurrent Protection
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
393 + 403 + 396
3
=
1192
3
6
397
50TFQ004-012
524A072-300