Danfoss NEMA-3R User manual

1.1 Description
The NEMA 3R cover kit is designed for D1h and D2h enclosure
sizes for the following applications:
•
VLT
®
HVAC Drive FC 102
•
VLT
®
Refrigeration Drive FC 103
•
VLT
®
AQUA Drive FC 202
•
VLT
®
AutomationDrive FC 302
This kit adds a cover to the outside vents of the frequency
converter and provides NEMA 3R compliant protection against
weather and hosed water. The kit is used only with frequency
converters that have E5S in the 13–15 position of the type
code. The type code is found on the nameplate.
1 Protection rating for the NEMA 3R kit
Illustration 1.1 Example of a D-size Enclosure Nameplate
The NEMA 3R kit contains the following parts:
•
Top plate (1).
•
Gland plate with attached gasket (1).
•
NEMA 3R cover (1).
•
Adhesive label (1).
•
3-sectioned plastic bag containing:
-For top plate, lifting eyelets (2) and screws
(6) without captive washers.
-For gland plate, screws (6) for D1h or (8) for
D2h. These screws have captive washers.
-For NEMA 3R cover, screws (6) without
captive washers.
1.2 Kit Part Numbers
Part number Kit description
176F6302 NEMA 3R cover kit for D1h enclosures
176F6303 NEMA 3R cover kit for D2h enclosures
Table 1.1 Part Numbers for the NEMA 3R Cover Kit
1.3 Safety Instructions
WARNING
ELECTRICAL SHOCK HAZARD
VLT® frequency converters contain dangerous voltages when
connected to mains voltage. Improper installation, and
installing or servicing with power connected, can cause
death, serious injury, or equipment failure.
To avoid death, serious injury, or equipment failure:
•
Only use qualied electricians for the installation.
•
Disconnect the frequency converter from all power
sources before installation or service.
•
Treat the bus bar and heat sink as live whenever
the unit has mains voltage connected (including
when the frequency converter is tripped or waiting
for a command).
•
Follow the guidelines in these instructions and local
electrical safety codes.
Installation Instructions
NEMA-3R Cover Kit for D1h–D2h
VLT®FC Series FC 102, FC 103, FC 202, and FC 302
Danfoss A/S © 06/2015 All rights reserved. MI70I102

WARNING
DISCHARGE TIME
The frequency converter contains DC-link capacitors, which
can remain charged even when the frequency converter is
not powered. High voltage can be present even when the
warning LED indicator lights are o. Failure to wait the
specied time after power has been removed before
performing service or repair work can result in death or
serious injury.
•
Stop motor.
•
Disconnect AC mains and remote DC-link power
supplies, including battery back-ups, UPS, and DC-
link connections to other frequency converters.
•
Disconnect or lock PM motor.
•
Wait for the capacitors to discharge fully. The
minimum duration of waiting time is specied in
Table 1 . 2.
•
Before performing any service or repair work, use
an appropriate voltage measuring device to make
sure that the capacitors are fully discharged.
Voltage
[V]
Frequency converter
model
Minimum waiting
time
(minutes)
3x400 N110–N315 20
N90K–N250 20
3x690 N75K–N400 20
N55K–N315 20
Table 1.2 Discharge Time
1.4 Installation
1.4.1 Installing the Top Plate
1. Along the back side of the top vent opening, remove
the 4 screws (T25).
2. Place the top plate over the top vent opening.
See Illustration 1.2.
3. Secure the top plate with the 6 screws without
captive washers provided in the bag. Torque to 2.3
Nm (20 in/lbs).
4. If lifting eyebolts are needed for the application,
remove the plated eyebolts that came with the unit
and replace with the stainless steel eyebolts provided
in the bag.
NOTICE
UL NEMA 3R RATING
Eyebolts are not required to meet UL NEMA 3R rating.
1Topplate
2Eyebolt
3 Screw without captive washer
Illustration 1.2 Installing NEMA 3R Top Plate
Installation Instructions NEMA-3R Cover Kit for D1h–D2h
VLT
®
FC Series FC 102, FC 103, FC 202, and FC 302
2 Danfoss A/S © 06/2015 All rights reserved. MI70I102

1.4.2 Installing the Gland Plate
1. Remove the existing gland plate and gasket from the
bottom of the frequency converter by removing 6
screws (T25) from the D1h or 8 screws (T25) from the
D2h. See Illustration 1.3.
2. Make sure that the ange on the frequency converter
is smooth and clean in preparation for the new
gasket.
3. Place the new gland plate over the opening, with the
gasket side facing the opening. See Illustration 1.4.
4. Secure the new gland plate to the frequency
converter using the provided screws with captive
washers (6) for D1h or (8) for the D2h. Torque to 2.3
Nm (20 in/lbs).
1Gasket
2 Screw with captive washer
3Glandplate
Illustration 1.3 Removing Gland Plate
1Gasket
2 Screw with captive washer
3Glandplate
Illustration 1.4 Installing NEMA 3R Gland Plate
Installation Instructions NEMA-3R Cover Kit for D1h–D2h
VLT
®
FC Series FC 102, FC 103, FC 202, and FC 302
MI70I102 Danfoss A/S © 06/2015 All rights reserved. 3

1.4.3 Installing the NEMA 3R Cover
1. Set the NEMA 3R cover over the top of the frequency
converter. Align the NEMA 3R cover with the screw
holes on the top mounting plate and the screw holes
on the side of the unit.
2. Using the 6 screws provided in the bag, loosely
secure the cover to the frequency converter.
3. Torque all 6 screws to 2.3 Nm (20 in/lbs).
4. Apply adhesive label to the cover. See Illustration 1.5.
NOTICE
REMOVING COVER
To remove the NEMA 3R cover after it has been installed,
remove the front 2 screws on the bottom of the unit. The
cover can be removed after the other 4 screws are loosened
since the cover has slotted screw openings.
1 Screw without captive washer
2NEMA3Rsticker
3NEMA3Rcover
4 Screws to remove for taking o the NEMA 3R cover
Illustration 1.5 Installing NEMA 3R Cover
1.4.4 Calculating Nominal Current when Using
a NEMA 3R Cover
The nominal current of a frequency converter with the NEMA
3R cover is 90% of its current rating. For example, in a
FC-302N250T5 standard IP54 frequency converter, the nominal
output current in normal overload mode is 588 A. With the
NEMA 3R cover, the normal overload current is 0.90 x 588 =
529.2 A. The same calculation is used to calculate the nominal
current for the high overload mode.
1.4.5 Derating for Ambient Temperature when
Using a NEMA 3R Cover
Using the NEMA 3R cover kit requires derating due to higher
ambient temperatures within the enclosure. Using SFAVM
(stator ux asynchronous vector modulation) gives greater
switching control, but generates more heat than using 60°
AVM (asynchronous vector modulation). SFAVM switches
throughout the entire cycle, where 60° AVM only switches 2/3
of the time.
The maximum switching frequency is 16 kHz for 60° AVM and
10 kHz for SFAVM. The discrete switching frequencies are
shown in Illustration 1.6.
Installation Instructions NEMA-3R Cover Kit for D1h–D2h
VLT
®
FC Series FC 102, FC 103, FC 202, and FC 302
4 Danfoss A/S © 06/2015 All rights reserved. MI70I102

Illustration 1.6 Derating for Ambient Temperature
Installation Instructions NEMA-3R Cover Kit for D1h–D2h
VLT
®
FC Series FC 102, FC 103, FC 202, and FC 302
MI70I102 Danfoss A/S © 06/2015 All rights reserved. 5

1.4.6 Dimensions
Illustration 1.7 Exterior Dimensions for D1h with NEMA 3R Kit
Installation Instructions NEMA-3R Cover Kit for D1h–D2h
VLT
®
FC Series FC 102, FC 103, FC 202, and FC 302
6 Danfoss A/S © 06/2015 All rights reserved. MI70I102

Illustration 1.8 Exterior Dimensions for D2h with NEMA 3R Kit
Installation Instructions NEMA-3R Cover Kit for D1h–D2h
VLT
®
FC Series FC 102, FC 103, FC 202, and FC 302
MI70I102 Danfoss A/S © 06/2015 All rights reserved. 7

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on
order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respective companies. Danfoss
and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
Danfoss A/S
Ulsnaes 1
DK-6300 Graasten
vlt-drives.danfoss.com
*MI70I102*
MI70I102130R0636 06/2015