524a-b, c alternate motors – Bryant 569F User Manual
Page 73
73
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 = 4 v
(BC) 403 – 397 = 6 v
(AC) 397 – 396 = 1 v
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
50
TF
Q00
4
-012
52
4A0
7
2-
30
0