Westell NPGMT1125 Istruzioni per l’uso
______________________________________________________________________________________
530-101282 Rev D
1125-03A
October 2012
Westell
Fuse Panel
Technical Practice
NPGMT1125
10/10 GMT
NEBS Level 3 Verified
FEATURES
¾2 isolated groups (busses) of 10 GMT style fuses in each (20Amps/GMT position max).
¾Polarity insensitive (+/-24 or +/- 48 Vdc) battery voltage.
¾This panel can operate at 200 Amps of output current per panel (100 Amps per Bus).
¾Barrier terminal strips for fused outputs and isolated returns (grounds).
¾Two sets of Form C relay contacts are provided to extend alarms.
¾One set of alarm contacts for each; Bus A, and Bus B Alarm.
¾Single 1.75” mounting height (single panel space).
¾NEBS level 3 verified, with zone 4 earthquake.
¾UL Listed
____________________________________________________________________________________
2
1. GENERAL DESCRIPTION
1.1. The Westell NPGMT1125 Fuse Panel
provides up to 20 circuits for the distribution of
DC power to equipment. Each of the 20 circuits
is individually protected by a GMT style
telecommunication fuse (20A max) located on
the panel's faceplate. Alarm circuits are
provided to indicate and extend alarm
conditions when faults occur. Normal Operation
LEDs are provided to indicate the status of each
bus in the panel.
1.2. Input wiring is connected to a high current,
2-hole lug input block located at the rear of the
panel. A 90 degree standard copper barrel
compression lug is recommended for
connecting power to the input block (see page 4
for compatible lugs). Each group of fuses or
bus has its own completely isolated inputs,
allowing the distribution of two battery voltages
through the same panel.
1.3. The power is distributed to the load side
equipment through GMT style fuses. There are
10 fuses per fuse group and two groups per
panel. Each fuse position is available for
installer connection at the rear of the panel. A
designation card is provided for keeping records
of which position is connected to which
equipment and what amperage is to be used.
1.4. Alarm circuits are provided to alert service
personnel of fault conditions. A fuse alarm is a
blown fuse within a given bus. A red fuse alarm
LED !on the faceplate will illuminate when
a fuse alarm condition is present. As well, the
green Normal Operation LED 9will extinguish
to signal a fuse alarm or input power failure. If a
fuse failure occurs, the alarm relay for that bus
will change state. These fuse panels have
common (C), normally open (NO) and normally
closed (NC) terminals for alarms for each bus.
Note, the use of the alarm contacts is optional, if
you do not wish to extend the alarms, you don’t
have to do anything with the alarm outputs. The
“Normal” condition of the relay exists when
there are no blown fuses in the panel. The local
alarm LEDs are located on the front of the panel
as shown in Figure 1.4.1.
LED SYMBOL SIGNIFICANCE
GREEN 9NORMAL OPERATION
RED !BLOWN FUSE
10
789 2
13
POS
9
!
Ì
9
!
Ì
Figure 1.4.1
1.5. The NPGMT Fuse Panels are made from
0.050" steel and painted off-white. The
NPGMT1125 is designed to fit 19" wide racks
and use only one 1.75" panel space.
2. APPLICATION
2.1. The NPGMT1125 Fuse Panels are
designed to be used in the distribution of DC
power. They are rack mount panels that can
provide fused DC power to up to 20 individual
circuits, or 10 pieces of equipment, providing
redundant battery feeds to each.
2.2 The NPGMT family fuse panels are suitable
for installation as part of a Common Bonding
Network (CBN) for electrically bonding the shelf
type chassis of this fuse panel to its equipment
rack (via mounting brackets or chassis bonding
studs). Note that all power return inputs (RTNs)
are electrically isolated from each other and from
the fuse panel chassis. As well, this family of fuse
panels is suitable for restricted access locations in
Network Telecommunications Facilities and OSP.
3. CIRCUIT DESCRIPTION
3.1. Power is connected to the fuse panel via
¼” studs on 5/8” centers located at the rear of
the panel (torque 5.5 ft-lbs). These inputs are
high current stud blocks that supply current to
the fuse panel. Connect the battery return cable
to the stud input that is labeled “RTN” and the
Battery supply cable to the terminals labeled
“BAT”.
____________________________________________________________________________________
3
3.2. Distribution of current from each bus is
provided by GMT style fuses. Each bus has 10
fuse holders for distribution, the fuses are
labeled 1 to 10 on each bus. Each fuse position
is made available at the rear of the fuse panel.
Maximum fuse size allowed in each position is
at 20 Amps; provided the maximum bus current
or BDFB fuse is not exceeded (each bus is
rated at 100Amps max).
3.3. Alarm circuitry provides 1 set of form “C”
contacts (C, NO and NC) for each bus (Bus A,
and Bus B). In the event of a fuse alarm, the
proper relay will change states, providing a
connection between the Normally Open “NO”
and Common “C” terminals for that bus. The
normally closed “NC” terminal will open to high
impedance.
4. INSTALLATION
Please read completely before beginning.
WARNING: Installation should only be performed
by an experienced Installer familiar with DC power
distribution systems.
This product must be installed within a
RESTRICTED ACCESS LOCATION where
access is through the use of a tool, lock and
key, or other means of security, and is
controlled by the authority responsible for
the location. This product must be installed
and maintained by TRAINED SERVICE
PERSONNEL ONLY.
4.1. Unpack and inspect the Westell Fuse Panel
for possible damage incurred during shipping. If
damage is found, file a claim immediately with the
carrier, and notify the Westell Customer Service
Department.
4.2. Mount the panel on the equipment rack using
the thread forming #12-24 rack mounting screws
and tooth lock washers provided.
WARNING: For safety reasons all wiring should
be done with the power source removed (when
possible).
Rack Mount Instructions:
Elevated Operating Ambient - For closed or
multi-unit rack assemblies, the operating ambient
may be greater than room ambient. Take care to
install the equipment in an environment
compatible with the maximum ambient
temperature (Tma) specified by the manufacturer.
Reduced air flow - Installation of the equipment
in a rack should be such that the amount of air
flow required for safe operation is not
compromised.
Mechanical Loading - Mounting of the equipment
in the rack should be such that a hazardous
condition is not achieved due to uneven
mechanical loading.
Circuit Overloading - Consideration should be
given to the connection of the equipment to the
supply circuit and the effect that overloading of
the circuits might have on overcurrent protection
and supply wiring. Appropriate consideration of
equipment nameplate ratings should be used
when addressing this concern.
Reliable earthing - Reliable earthing of rack-
mounted equipment should be maintained.
Particular attention should be given to supply
connections other than direct connections to the
branch circuit.
Note: A readily accessible disconnect device shall
be incorporated external to this equipment.
4.3. Remove the distribution fuse feeding the
input cables that are to be connected to the new
panel. Attach the input cables to the input
terminal block in accordance to the National
Electrical Code, ANSI/NFPA, and Canadian
Electrical code. Hook up the input cables to the
input terminal block on the fuse panel (“BAT” &
“RTN” for each bus). Each high current input
terminal uses a two hole compression lug (1/4” on
5/8”, torque to 5.5 ft-lbs). A two hole lug must be
used for proper operation (see fig 4.4.1)
____________________________________________________________________________________
4
Note: The supply source must be limited to an
instantaneous short-circuit current not to exceed
450 Amps.
BAT
RTN
BUS B
910
BAT
RTN
Figure 4.4.1
4.4. The battery outputs (“BAT”) are available at
the terminal blocks (#6 screw torque to 9 in-lbs,
up to 10awg fork) at the rear of the panel. Each
fuse position is numbered and that circuit is
available at the terminal block position with the
same number.
4.5. All battery return (“RTN”) connections are
also terminated on barrier strips (#6 screw, up
to 10awg fork). Note that these returns are
isolated from the chassis frame.
4.6. This panel has Bus A, and Bus B alarms.
Each alarm has a common (C), normally open
(NO) and normally closed (NC) alarm contact.
In an alarm the “C” contact will short to the “NO”
contact and the “NC” will open. You can extend
the alarm connections as per your alarm system
requirements. Westell recommends you fuse
the alarm battery supply (ABS) to 1A or less to
protect the alarm wiring and circuitry.
4.7. CHASSIS GROUND; For safety reasons,
and as recommended by NEBS, the chassis
should be electrically connected to the rack
ground. From step 4.2. the panel should
already be ground to the rack via the #12-24
thread forming rack screws and outside tooth
lock washers. In addition to grounding via the
mounting brackets, an appropriate cable size as
outlined in section 5 (typically 10awg or larger)
and the ¼” bolt and locks on rear of chassis
(1/4” bolt torque;5.5ft-lbs or 7.5Nm) should also
be used. Consult the National Electric Code,
ANSI/NFPA, and Canadian Electrical code for
AWG sizes.
4.8. Power up the panel by installing a Listed
fuse/breaker rated for at least 60Vdc, with a trip
rating of 125 Amps Max. The panel should
power up with the Normal Operation LED 9
illuminated and without any red LEDs !
illuminated, and the relays should be in the
“Normal” state (“C” connected to “NC”).
4.9. If you wish to verify the fuse alarm circuit,
you can insert a blown fuse into one of the
empty fuse holders. The red Fuse Alarm
LED !should light and the Normal
Operation LED 9should extinguish and the
appropriate alarm extension relay should
change states to extend the alarm.
4.10. Install panel output distribution fuses as
required. Be sure to size fuses to operate at no
more than 70% of their rating (14A max for a
20A fuse). Use the provided designation card to
keep a record of which equipment is connected
to which circuit and what the fuse rating is. Be
careful not to overload the panel bus or BDFB
fuse position rating supplying the panel.
____________________________________________________________________________________
5
5. SPECIFICATIONS
5.1. Voltage -/+24 or -/+48 VDC Typical
-/+22 to -/+58 VDC Max.
5.2. Fuse Size 60Vdc, 0.18 to 20 Amps Max*
450A @60Vdc Interrupt rating
(Littelfuse Type 481 Series)
5.3. Current/Bus 100 Amps Max.**
5.4. Current/Panel 200 Amps**
5.5. Output Fuse GMT Style Fuse Holders
5.6. Output/Bus 10 Fuses (20 per panel)
5.7. Output/Panel 2 Busses per Panel
5.8. Input Block Two ¼” Studs on 5/8 centers
Max std lug is 1 AWG
Max lug width = 0.710”
5.9. Output Block #22 AWG to 12 AWG wire
Or fork/ring for #6 screw,
10AWG forks/rings will work
Max lug width = 0.320”
5.10. Alarm Block #6 screws at rear
5.11. Relay Current 1 Amps/58Vdc max
5.12. Dimensions 1¾ H, 17 W,2½ D
5.13. Rack Mounting 19” Racks for 1-1/4”
Panel Spaces
5.14. Weight Appx 4 Lbs
5.15. Operating Temp. -40° to +65°C (Tma)
(-40°F to +149°F)
5.16. Color Off White
5.17 Interrupt Fuse Rating 450A (max)
*We recommend that you size fuses such that they do
not run at more than 70% of their rating. Thus a 20A fuse
should not be run at more than 14A.
**The sum of the fuse ratings must not exceed the bus
rating, or input fuse rating
Compatible lugs for Input Block
2 hole compression lugs for 1/4” studs on
5/8” centers (torque 5.5ft-lbs) example;
Panduit® LCD1-14A 1awg wire
LCD2-14A 2awg wire
LCD4-14A 4awg wire
LCD6-14A 6awg wire
LCD8-14A 8awg wire
The Panduit® CT-1700 crimping tool can be
used for securing wire to any of these lugs.
Input wiring should be rated 90°C or better
and fused at 125% of total Bus current (ie: up
to 125Amps MAX rated input fuse/breaker)
Output lugs (locking fork recommended):
Ring or fork for #6 screw (up to 10awg).
(Torque to 9 in-lbs, use wire rated 90°C or
better.
NOTE: If fuse size is not specified in the
equipment manual, fuses should be selected
such that they do not run at more than 70%
of their rating. When installing fuses, the
sum of the fuses installed in each bus should
not exceed the bus rating (100 Amps) or
input fuse rating.
Chassis Grounding: Depending on the bus input current being supplied, the chassis bonding
conductor used should meet the minimum requirements. Please note that 100 A is the maximum
allowable bus current rating.
Protective Current
Rating Minimum AWG Recommended
Compression Lug
Minimum Wire
Temperature rating
0-40 Amps 10 AWG Panduit, LCD10-14A 90°C
40-63 Amps 8 AWG Panduit, LCD8-14A 90°C
63-80 Amps 6 AWG Panduit, LCD6-14A 90°C
80-100 Amps 4 AWG Panduit, LCD4-14A 90°C
____________________________________________________________________________________
6
6. TECHNICAL SERVICES
6.1 If technical or customer assistance is
required, contact Westell by calling or using
one of the following options:
Voice: (800) 377-8766
For additional information about Westell, visit
the Westell World Wide Web site at
http://www.Westell.com.
7. WARRANTY & REPAIRS
7.1 Westell warrants this product to be free
of defects at the time of shipment. Westell
also warrants this product to be fully
functional for the time period specified by the
terms and conditions governing the sale of
the product. Any attempt to repair or modify
the equipment by anyone other than an
authorized Westell representative will void
the warranty.
7.2 Westell will repair or replace any
defective Westell equipment without cost
during the warranty period if the unit is
defective for any reason other than abuse,
improper use, or improper installation. To
return defective equipment, first request a
Return Material Authorization (RMA) number
from Westell by calling or using one of the
options shown below. Once an RMA number
is obtained, return the defective unit (freight
prepaid), along with a brief problem
description, to the address we will provide to
you when you contact us.
Replacements will be shipped in the fastest
manner consistent with the urgency of the
situation. Westell will continue to repair or
replace faulty equipment beyond the
warranty period for a nominal charge.
Contact Westell for details.
____________________________________________________________________________________
7
Westell
____________________________________________________________________________________
8
Westell
BUS B BUS A
BUS A 10
2
1436578
9
POS 48 VDCNEG 24 VDC
10
2
1436578
9
POS 48 VDCNEG 24 VDC
9
!
Ì
9
!
ÌInsert fuse
flag down
20A MAX
BUS B
ACCEPTS
CNC
AA
BB
TRQ nuts to 5.5 ft-lbs max TRQ nuts to 5.5 ft-lbs max
BAT
RTN
BUS B
TRQ nuts to 3 ft-lbs max
BAT
RTN
BUS A
NO is center alarm terminal
12346578910
BAT
RTN
12346578910
BAT
RTN
C:\DocumentsandS ettings\sdolinsky\Desktop\Westell_By_Noran_Tel_RED.bmp
C:\Projects\ Other\Logo s\westellc_tr ansparent.gif
____________________________________________________________________________________
9
Indice
Altri manuali Westell Unità di distribuzione dell'energia
