15T x 20m Span x 10.2 Lift DG EOT Crane
Selection of Main Hoist Motor & Brake Mechanical Rating Required in KW : M x V x Cv x Cdf 6.12 x E Where : Rated load = Weight of hook block = Weight of wire rope = M = Mass of the rated load plus weight of the hook block & wirerope:
15.0 0.50 0.46 15.96
8 m/min
V = Specified Hoisting Speed: Cv = Service facor for vertical motion for ac motor:
0.67
Cdf = Duty Factor Of Hoisting Mechanism for Class M8 of Crane:
1.7
Camb = Derating Factor for the required ambient Temperature (50°C): E = Combined Efficiency Of Gears & Sheaves:
0.88
n
( 0.95 ) x ( 0.99
m
) =
0.83
where: 0.95 = Efficiency of Gear Pair per Stage = 3 n = No of Ge Gear Pairs m = Total Total No. No. of Rotating Rotating Sheaves Sheaves passe passed d by each part part of the the 3 moving rope attached to the drum = 0.99 = Efficiency Efficiency of Rotating Sheave
Mechanical Rating Required in KW 15.96 x 6.12 x
x 8 0.83
0.67 x 1.7
=
28.5 28.56 6 KW
Electrical power rating required in KW = Mechanical rating Camb =
28.56 0.88
=
32.46 kW
Motor rating at 40° Type: Squirrel Cage Motor Kilo Watt =
T T T T
Make: 37 KW
Siemens Starts/ Hr: 300
Frame:
TEFC, 60% CDF, S4 Duty, IP55, 6 Pole, 1000rpm (SYN), CL-F, B3, Single Shaft Extension.
15T x 20m Span x 10.2 Lift DG EOT Crane
Brake Min. Braking Torque Required As Per IS = 150 % of the Rated Torque Transmitted to the Brake Drum from the suspended Maximum Safe Load and the Brake not being taken into consideration
Min. Braking Torque required =
Type: DCEM Make: BCH Torque Capacity = 74.6 KGM
(1.5 x
28.56 x 716) = (750 x 0.746)
Qty: 1 Shoe Type Drum Diameter: Ø300
54.83 KGM
15T x 20m Span x 10.2M Lift DG EOT Crane
Selection of Cross Travel Motor & Brake Mechanical Rating Required in KW : MVSCdf (1100a) x F + 6117TCamb 981N Where : Rated load = Weight of the Crab = M = Mass of Moving Load (Weight of Crab+Weight of Rated Load)
15.0 T 3.0 T 18.0 T 20 m/min
V = Specified travel Speed in M/Min: S = Service Factor For Providing Adequate Motor Heat Dissaption Capacity:
1.06
Cdf = Duty Factor for Horizontal Motion of Class M8 duty:
1.5
F = Overall Friction Factor for Wheels on Antifriction Brgs in KG./Tonnes:
8 10 cm/s2
2
a = Average Linear Acceleration Trolley in cm/s : N = Resultant Mechanical Efficiency of the Drive:
0.86
T = A Factor Taken For Average Torque By The Motor:
1.7
Camb = Derating Factor for the required ambient Temperature (50°C):
0.88
Mechanical Rating Required in KW 18
x
20 6117
x x =
1.06 1.7
x
1.5
x
8
+
1100 x 10 981 x 0.86
1.16 KW
Electrical power Rating Required in KW = Mechanical rating Camb =
1.16 0.88
=
1.32 kW
Motor rating at 40°C: Squirrel Cage Type: Motor Kilo Watt =
Make: Siemens 1.5 KW Starts/Hr: 150
Frame:
TEFC, 60% CDF, S4 Duty, IP55, 6 Pole, 1000rpm (SYN), CL-F, B-3, Single Shaft Extension.
15T x 20m Span x 10.2M Lift DG EOT Crane
Brake Min. Braking Torque Required As Per IS = 100 % of Motor Torque Maximum Safe Load and the Brake not being taken into consideration
Min. Braking Torque required =
DCEM Type: Torque =
1.16 x 716) = (1.0 x (960.00 x 0.746) Make: BCH
8 KGM
Shoe Type Drum Diameter: Ø160
1.16 KGM
15T x 20m Span x 10.2M Lift DG EOT Crane
Selection of Long Travel Motors & Brakes Mechanical Rating Required in KW (for twin drive): MVSCdf (1100a) x F + 6117TC amb 981N Where : Rated load = Weight of crane = M = Mass of Moving Load (Weight of Crab+Weight of Rated Load)
15.0 T 7.0 T 22.0 T 50 m/min
V = Specified travel Speed in M/Min: S = Service Factor For Providing Adequate Motor Heat Dissaption Capacity:
1
Cdf = Duty Factor for Horizontal Motion of Class M8 duty:
1.5
F = Overall Friction Factor for Wheels on Antifriction Brgs in KG./Tonnes:
8 25 cm/s2
2
a = Average Linear Acceleration Trolley in cm/s : N = Resultant Mechanical Efficiency of the Drive:
0.86
T = A Factor Taken For Average Torque By The Motor:
1.7
Camb = Derating Factor for the required ambient Temperature (50°C):
0.88
Mechanical Rating Required in KW 22
x
50 6117
x x =
1 1.7
x
1.5
x
8
+
1100 x 25 981 x 0.86
4.25 KW
Electrical power Rating Required in KW = Mechanical rating Camb =
4.25
=
4.83 kW
0.88
Motor rating at 40°C: Squirrel Cage Type: Motor Kilo Watt =
Make: Siemens 5.5 KW Starts/Hr: 150
Frame: Qty:
2Nos.
TEFC, 60% CDF, S4 Duty, IP55, 6 Pole, 1000rpm (SYN), CL-F, B-3, Single Shaft Extension.
x 0.66
15T x 20m Span x 10.2M Lift DG EOT Crane
Brakes Min. Braking Torque Required As Per IS = 100 % of Motor Torque Maximum Safe Load and the Brake not being taken into consideration
Min. Braking Torque required =
DCEM Type: Torque =
4.25 x 716) = (1.0 x ( 960.00 x 0.746) Make: BCH
8 KGM
Shoe Type Drum Diameter: Ø160
4.25 KGM
Qty: 2Nos.
