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36 Mentor MP User Guide
www.controltechniques.com Issue: 3
4.3 AC supply requirements
The standard drive is rated for a nominal supply voltage up to 480Vrms.
An optional rating of 575Vrms is available for size 1 drives.
An optional rating of 575Vrms and 690Vrms is available for size 2 drives.
4.3.1 Supply types
Drives rated for supply voltages of up to 575V (rated up to 210A) and
600V (350A and above), are suitable for use with any supply type i.e.
TN-S, TN-C-S, TT, IT with grounding at any potential i.e neutral, centre
or corner (“Grounded delta”).
Grounded delta supplies >575V are not permitted for drives rated up to
and including 210A. Grounded delta supplies >600V are not permitted
for drives rated 350A and above.
4.3.2 Supply fault current
The maximum fault current level of the supply to all circuits is 100kA
subject to the capability of the semiconductor fuse fitted.
4.3.3 MOV ground disconnect
The facility for disconnecting the jumper (link) between varistors and
ground is provided for special circumstances, where a sustained high
voltage may be present between lines and ground, for example during a
high potential test or in certain situations with IT supplies and multiple
generators. If the jumper (link) is disconnected then the immunity of the
drive to high voltage impulses is reduced. It is then only suitable for use
with supplies having overvoltage category II, i.e. not for connection at
the origin of the low voltage supply within a building.
Figure 4-6 Removing the MOV ground connection on size 1 drives
The method for disconnecting the MOV ground connection on size 1
drives is shown below:
1. Remove the M4 x 16 screw using T20 Torx driver.
2. Remove the M4 x 12 screw using T20 Torx driver.
3. Remove the plate.
4. Re-fit the M4 x 12 screw using T20 Torx driver and tighten to a
torque of 0.6 Nm (0.44 Ib ft).
5. Fit a M4 x 16 nylon screw (not supplied) and tighten to a torque of
0.25 Nm (0.18 Ib ft).
Figure 4-7 Removing the MOV ground connection on size 2A / 2B
drives
The method for disconnecting the MOV ground connection on size 2A /
2B drives is shown below:
1. Remove the M4 x 30 screw using T20 Torx driver .
If re-fitting the M4 x 30 screw using T20 Torx driver, the screw must be
tightened to a torque of 2.5Nm (1.84 Ib ft).
Figure 4-8 Removing the MOV ground connection on size 2C / 2D
drives
The method for disconnecting the MOV ground connection on size 2C /
2D drives is shown in Figure 4-8 above:
1. Remove the M4 x 30 screw using T20 Torx driver .
If re-fitting the M4 x 30 screw using T20 Torx driver, the screw must be
tightened to a torque of 2.5Nm (1.84 Ib ft).
Grounded delta supplies exceeding 575V are not permitted
for drives up to and including 210A. Grounded delta supplies
exceeding 600V are not permitted for drives rated 350A and
above.
The M4 x 16 screw (1) should not be re-used if the plate (3)
is not re-installed. Instead a nylon screw should be used.
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