Quantum MP User Guide
43
Issue: A4 www.emersonct.com
Figure 4-11 Location of external suppressor resistor terminals,
Size 2
For applications where the external suppressor resistance is chosen to
be less than the recommended value for reasons of economy, it is
essential that the resistance is not less than the minimum resistance
shown in Table 4-19. However selecting a resistance less than the
recommended value requires a more complex installation. The power
rating of the resistor can be selected by the user according to the
dissipation required for the application, up to a maximum of 150W.
Table 4-19 Minimum allowable external suppression resistance
Figure 4-12 Protection circuit for an external suppression resistor
4.11 Ground leakage
The ground leakage current depends on whether an external EMC filter
is installed. Ground leakage currents for external EMC filters can be
obtained from the manufacturers data sheet for the filter being used.
With no external EMC filter:
<1mA
4.11.1 Use of residual current device (RCD)
There are three common types of ELCB / RCD:
1.
AC - detects AC fault currents
2.
A - detects AC and pulsating DC fault currents (provided the DC
current reaches zero at least once every half cycle)
3.
B - detects AC, pulsating DC and smooth DC fault currents
•
Type’s A and AC should never be used with Quantum MP
drives.
•
Type B must be used with all Quantum MP drives.
If an external EMC filter is used, a delay of at least 50 ms should be
incorporated to ensure spurious trips are not seen. The leakage current
is likely to exceed the trip level if all of the phases are not energized
simultaneously.
The installer of the drive is responsible for ensuring compliance with the
EMC regulations that apply where the drive is to be used.
4.12 EMC (Electromagnetic compatibility)
The Quantum MP meets immunity requirements (specified in section
12.2.3
Electromagnetic compatibility (EMC)
on page 153) with no
special precautions.
N
Some special measures may be required in certain applications where
the control cables are long or pass outside the building. See section
4.12.5
Surge immunity of control circuits - long cables and connections
Radio frequency noise emission can occur from any of the power
connections i.e. main and auxiliary A.C connections, armature and field
output terminals.
For many applications in heavy industrial environments the noise
Model
Resistance
QMP45A4(R)
500 (maximum 150W)
QMP75A4(R)
QMP155A4(R)
QMP210A4(R)
QMP350A4(R)
500 (maximum 300W)
QMP400A4(R)
QMP550A4(R)
QMP700A4(R)
Overload Protection
When using an external suppressor resistor of a resistance or
power rating less than the recommended rating, it is essential
that an overload protection device is incorporated in the
resistor circuit (refer to Figure 4-12).
External suppressor resistor protection parameter settings
The software provided by the Quantum MP provides
overload protection. Failure to correctly configure Pr
11.62
,
Pr
11.63
and Pr
11.64
, as described in the
Advanced User
Guide
could lead to the resistor being overloaded.
To external suppression resistor
WARNING
WARNING
Only type B ELCB / RCD are suitable for use with Quantum
MP drives.
WARNING
NOTE
NOTE
