Heatsink Fan; Ground Leakage; Emc (Electromagnetic Compatibility) - Johnson Controls VFD67 Series Getting Started Manual

Safety Product Mechanical
Information Information Installation
4.2

Heatsink fan

4.2.1 Heatsink fan operation
The VFD67 is ventilated by an internal heatsink mounted fan. The fan
housing forms a baffle plate, channelling the air through the heatsink
chamber. Thus, regardless of the mounting method (surface or through-
panel mounting), the fitting of additional baffle plates is not required.
Ensure the minimum clearances around the drive are maintained to
allow air to flow freely.
The heatsink fan on VFD67 size E is a dual speed fan and on size F, it is
a variable speed fan. The drive controls the speed at which the fan runs
based on the temperature of the heatsink and the drive's thermal model
system. The VFD67 size F is also installed with a single speed fan to
ventilate the capacitor bank.
The heatsink fan on the VFD67 size E to F is supplied internally by the drive.
4.3

Ground leakage

The ground leakage current depends upon the internal EMC filter being
installed. The drive is supplied with the filter installed. Instructions on
removal of the internal EMC filter are given in section 4.3.1 Internal EMC
filter on page 20.
With internal EMC filter installed
Size E and F
28mA* AC at 400V, 50Hz
30μA DC with 600V DC bus (10MΩ)
*Proportional to the supply voltage and frequency.
NOTE
The above leakage currents are just the leakage currents of the drive
with the internal EMC filter connected and do not take into account any
leakage currents of the motor or motor cables.
With internal EMC filter removed
<1mA
NOTE
In both cases, there is an internal voltage surge protection device
connected to ground. Under normal circumstances this carries negligible
current.
When the internal EMC filter is installed, the leakage current
is high. In this case, a permanent fixed ground connection
must be provided, or suitable measures taken to prevent a
safety hazard occurring if the connection is lost.
WARNING
4.3.1 Internal EMC filter
It is recommended that the internal EMC filter be kept in place unless
there is a specific reason for removing it.
On VFD67 size F, when used with ungrounded (IT) supplies,
the internal EMC filter must be removed unless additional
motor ground fault protection is installed or, in the case of size
F only, the external EMC filter is also used.
WARNING
For instructions on removal, refer to Figure 4-6.
Figure 4-6 Removal of the internal EMC filter, size E and F
1 2
20
Electrical Keypad and
Parameters
Installation Display
4
3
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Quick Start
Diagnostics
Commissioning
Loosen/remove screws as shown (1) and (2).
Remove filter (3) and ensure the screws are replaced and re-tightened (4).
4.3.2 Use of earth (ground) leakage circuit breakers
(ELCB) / ground fault circuit interrupter (GFCI)
/ residual current device (RCD)
There are three common types of ELCB/RCD:
Type AC - detects AC fault currents
Type A - detects AC and pulsating DC fault currents (provided the
DC current reaches zero at least once every half cycle)
Type B - detects AC, pulsating DC and smooth DC fault currents
• Type AC should never be used with drives
• Type A can only be used with single phase drives
• Type B must be used with three phase drives
4.3.3 Further EMC precautions
Further EMC precautions are required if more stringent EMC emission
requirements apply:
• Operation in the first environment
• Conformity to the generic emission standards
• Equipment which is sensitive to electrical interference operating
nearby
In this case it is necessary to use:
The optional external EMC filter
A shielded motor cable, with the shield clamped to the grounded
metal panel
A shielded control cable, with the shield clamped to the grounded
metal panel
A full range of external EMC filters is also available for use with VFD67.
4.4

EMC (Electromagnetic compatibility)

4.4.1 Grounding hardware
The VFD67 size E and F are provided with a grounding bracket and
grounding clamp. They can be used as cable management bracket/
clamp or they can be used to facilitate EMC compliance. They provide a
convenient method for direct grounding of cable shields without the use
of 'pig tails'. Cable shields can be bared and clamped to the grounding
bracket using metal clips or clamps (not supplied) or cable ties. Note that
the shield must in all cases be continued through the cable clamp to the
intended terminal on the drive, in accordance with the connection details
for the specific signal.
Figure 4-7 Fitting the grounding clamp
VFD67 Size E to F Getting Started Guide
UL Listing Technical
Parameter List
Information specifications
Issue Number: 1