Vascat MAC R 080.070, Instruction And Maintenance Manual

Page: 12 / 60

INSTRUCTIONS AND MAINTENANCE MANUAL
MAC R MOTORS
PAGE: 12
CODE: CTT12 EDITION: 01 DATE: MAY 2013
Subject to technical changes without prior notice
The data given in all the documentation provided by VASCAT includes tolerances in accordance with the IEC/EN
60034-1 standard and they are based on test procedures as provided in the IEC 60034-2 standard. The table
shows the tolerances for some of the most relevant parameters:
Efficiency Power factor Slip
Maximum
torque
Inertia Noise level
-15% (1-η)
-1/6 (1-cos

)
+/-20% -10% +/-10% +3 dB
Table 3: Tolerances
3.3 Definitions
3.3.1 Duty
Three-phase induction motors are usually designed to develop their rated power in continuous service with no
overheating problems. However, most motors operate under a non-continuous type of service. Some motors
connect only for a few moments, others work all day, but they only charge up briefly, etc. The EN 60034-1
standard defines 10 main service types and those summarised in the following table apply to MAC R motors:
Duty Description Definition
S1 Continuous service
Operation in constant charging status with sufficient duration to reach
thermal balance.
S2 Temporary service
Operation in constant charging status during a shorter period than
necessary to reach thermal balance, followed by a standby period that is
sufficient to cool down to ambient temperature.
S3 Intermittent regular service
Chain of identical services made up of a constant charging period
followed by a standby period.
S5
Intermittent regular service
with electrical braking
Chain of identical services made up of a start-up period, a constant
charging period and an electrical braking period followed by a standby
period.
S6
Regular uninterrupted
service with intermittent
charging
Chain of identical services made up of a constant charging period
followed by a period of load-free operation.
S7
Regular uninterrupted
service with intermittent
charging and electrical
braking.
Chain of identical services made up of a start-up period, a period of
constant charging, a period of load-free operation and a period of
electrical braking.
Table 4: Duty