There are eight types of duty type for these series motors, S2,S3,S4,S5,S6,S7,S8 and S9. The basic duty type is S3－40％ (duty type is S3, cyclic duration factor is 40%, each cyclic is 10min). The following duty type are most useful to these series motors.
1．Short-time duty type (S2)
Operation of constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest and de-energized period of sufficient duration to re-establish machine temperature within 2 deg K of the coolant.
2. Intermittent periodic duty type (S3)
A sequence of identical duty cycles, each including a period of operation at constant load and a rest and de-energized period but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium In this duty type, the cycle is such that the starting current does not significantly affect the temperature rise.
3. Intermittent periodic duty type with starting (S4)
A sequence of identical duty cycles, each including a significant period of starting, a period of operation of constant load and a rest and de-energized period, but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium.
4. Intermittent periodic duty type with electric braking (S5)
A sequence of identical duty cycles, each consisting of a period of starting, a period of operation at constant load and a rest and de-energized period, but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium.
5. The motor will operate satisfactorily under following conditions:
(1) Ambient temperature not exceeding 40℃ (for crane uses) or 60℃ (for metallurgical uses).
(2) Not above sea-level 1000m.
(3) Frequent and significant mechanical vibration and shocks.
(4) Frequent starting, braking(electrical or mechanical) or reversing.
6. The rated frequency of the motor is 50Hz and rated voltage is 380V.
7. Connection: The stator winding is connected in Y for 132kW and below and in △ for the rest. In Y with zero lead is also supplied.
8. Output and speed
The range of rated output and, as-ynchrouons speed for the basic duty type (S3-40%) are shown in table 1.

table 1

机座	同步转速	1000 750	600
Frame	Synchronous speed	r/min r/min	r/min
112M		1.5
132M1		2.2
M2		3.7
M1		5.5
160M2		7.5
L		11	7.5
180L		15	11
200L		22	15
225M		30	22
250M1		37	30
M2		45	37
280S		55	45	37
M		75	55	45
315S			75	55
M			90	75
M1				90
355L1				110
L2				132
400L1				160
L2				200

9. For YZ series motors, when working with basic duty type the guaranteed values of the ratio of the maximum torque and the locked rotor torque to the rated torque under rated voltage are given in table 2.
table 2

额定功率(kw)	最大转矩/额定转矩	堵转转矩/额定转矩
Rated Power(kw)	Max. Torque TM	Block Torque
	Rated Torque TN	Rated Torque TN
≤5.5	2	2
＞5.5～11	2.3	2.3
＞11	2.5	2.5

10. For the YZR series motors, when working with basic duty type, the guaranteed values of the ratio of the maximum torque to the rated torque under rated voltage are given in Table 3.

table 3

额定功率(kw)	最大转矩/额定转矩
Rated Power(kw)	Max. Torque TM
	Rated Torque TN
≤5.5	2.3
＞5.5～11	2.5
＞11	2.8

11. The moment of inertia Jm, open-circuit voltage, no-load current and weight of motor are shown in Table 4.

table 4
table 4

1. The key data such as the type. The rated power and voltage of the products, voltage - variable range and operation characters within the range, and the location of the junction box mounted should be shown clearly.
2. The factory will provide special type motor with the pole number, structure and mounting specially designed according to the requirement of the customers.
The products can also equipped with various sensors (speed meter motor, super speed swithch and cooler, etc). braking devices (electro magnetical, turbine type) and heat sensitive protection device and heating section.