Vascat MAC QM, Operation And Maintenance Manual

Page: 13 / 56

OPERATION AND MAINTENANCE MANUAL
MAC QM MOTORS
PAGE: 13
CODE: CTT42 EDITION: 01 RELEASE: JULY 2016
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:
Power Efficiency Power factor Slip
Maximum
torque
Inertia Noise level
Pn < 150 kW -15% (1-η)
-1/6 (1-cos

)
+/-20% -10% +/-10% +3 dB
Pn > 150 kW -10% (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 deliver their rated power in continuous service with no overheating
problems. However, most motors operate under a non-continuous type of service. Some motors are switched on for a few
moments only, 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 table below apply to MAC QM motors:
Duty Description Definition
S1 Continuous duty
Operation under constant load, for a time duration enough to reach
thermal balance.
S2 Short-time duty
Operation under constant load, for a time period shorter than required to
reach thermal balance, followed by a standby period that is sufficient to
cool down to ambient temperature.
S3 Intermittent periodic duty
A series of identical duty cycles consisting of a constant-load period
followed by a stillstand period.
S5
Temporary intermittent duty
with starting and electric
braking
A series of identical duty cycles consisting of a start period, a constant-
load period and an electric braking period, followed by a stillstand
period.
S6
Continuous operation
periodic duty under
intermittent load
A series of identical duty cycles consisting of a constant-load period
followed by a no-load operation period.
S7
Continuous operation
periodic duty under
intermittent load with
electric braking
A series of identical duty cycles consisting of a start period, a constant-
load period, a no-load period and an electric braking period.
Table 4: Duty types