H3C S5560X-30C-EI User manual

i
Contents
1 Preparing for installation··········································································1-1
Safety recommendations ································································································································1-1
Examining the installation site·························································································································1-1
Temperature/humidity·····························································································································1-2
Cleanliness··············································································································································1-2
Corrosive gas limit···································································································································1-2
EMI··························································································································································1-3
Laser safety·············································································································································1-4
Installation tools ··············································································································································1-4
2 Installing the switch··················································································2-5
Installing the switch in a 19-inch rack··············································································································2-7
Installation methods································································································································2-7
Installation accessories···························································································································2-8
Rack-mounting the switch by using front mounting brackets··································································2-9
Rack-mounting the switch by using front and rear mounting brackets··················································2-10
Mounting the switch on a workbench············································································································2-14
Grounding the switch ····································································································································2-14
Grounding the switch with a grounding strip·························································································2-14
Grounding the switch with a grounding conductor buried in the earth ground······································2-16
Installing/removing a fan tray························································································································2-17
Installing a fan tray································································································································2-18
Removing a fan tray······························································································································2-18
Installing/removing a power module ·············································································································2-19
Installing a PSR150-A1/PSR150-A2/PSR150-D1 power module·························································2-20
Removing a PSR150-A1/PSR150-A2/PSR150-D1 power module·······················································2-21
Installing a PSR360-56A/PSR560-56D/PSR720-56A/PSR1110-56A power module···························2-21
Removing a PSR360-56A/PSR560-56D/PSR720-56A/ PSR1110-56A power module························2-23
Connecting the power cord···························································································································2-24
Connecting the power cord for the built-in AC power module (1) ·························································2-25
Connecting the power cord for the built-in AC power module (2) ·························································2-26
Connecting a power cord for the built-in DC power module··································································2-27
Connecting the PSR150-A1/PSR150-A2······························································································2-27
Connecting the PSR150-D1/PSR560-56D····························································································2-28
Connecting the PSR360-56A/PSR720-56A/PSR1110-56A··································································2-29
Installing/removing an expansion card··········································································································2-30
Installing an expansion card··················································································································2-30
Removing an expansion card················································································································2-33
Verifying the installation································································································································2-33
3 Accessing the switch for the first time····················································3-34
Connecting the switch to a configuration terminal·························································································3-34
Connecting a DB9-to-RJ45 console cable····························································································3-35
Connecting a USB-to-RJ45 console cable····························································································3-36
Connecting a micro USB console cable································································································3-38
Setting terminal parameters··························································································································3-40
Powering on the switch·································································································································3-40
4 Setting up an IRF fabric·········································································4-42
IRF fabric setup flowchart ·····························································································································4-42
Planning IRF fabric setup······························································································································4-43
Planning IRF fabric size and the installation site···················································································4-43
Identifying the master switch and planning IRF member IDs································································4-43
Planning IRF topology and connections································································································4-44
Identifying physical IRF ports on the member switches········································································4-45
Planning the cabling scheme················································································································4-45
Configuring basic IRF settings······················································································································4-48

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Connecting the physical IRF ports················································································································4-48
Verifying the IRF fabric setup························································································································4-49
5 Maintenance and troubleshooting··························································5-50
Fixed power module failure···························································································································5-50
AC input failure······································································································································5-50
DC input failure ·····································································································································5-50
AC and DC concurrent input failure ······································································································5-51
Removable power module failure ·················································································································5-52
Fixed fan tray failure······································································································································5-52
Removable fan tray failure····························································································································5-52
Configuration terminal display problems·······································································································5-53
No display ·············································································································································5-53
Garbled display·····································································································································5-53

1-1
1 Preparing for installation
This document is applicable to the following Ethernet switches:
•
S5560X-30C-EI
•
S5560X-30C-PWR-EI
•
S5560X-54C-EI
•
S5560X-54C-PWR-EI
•
S5560X-30F-EI
•
S5560X-30F-EIF
•
S5560X-54F-EI
•
S5560X-34S-EI
•
S5560X-54S-EI
Safety recommendations
To avoid any equipment damage or bodily injury caused by improper use, read the following safety
recommendations before installation. Note that the recommendations do not cover every possible
hazardous condition.
•
Before cleaning the switch, remove all power cords from the switch. Do not clean the switch
with wet cloth or liquid.
•
Do not place the switch near water or in a damp environment. Prevent water or moisture from
entering the switch chassis.
•
Do not place the switch on an unstable case or desk. The switch might be severely damaged in
case of a fall.
•
Ensure good ventilation of the equipment room and keep the air inlet and outlet vents of the
switch free of obstruction.
•
Connect the yellow-green protection grounding cable before powering on the switch.
•
Make sure the operating voltage is as required by the power modules.
•
To avoid electrical shocks, do not open the chassis while the switch is operating or when the
switch is just powered off.
•
When replacing field replaceable units (FRUs), including expansion cards, power modules, and
fan trays, wear an ESD wrist strap to avoid damaging the units.
Examining the installation site
The switch must be used indoors. You can mount your switch in a rack or on a workbench, but make
sure:
•
Adequate clearance is reserved at the air inlet and outlet vents for ventilation.
•
The rack or workbench has a good ventilation system.
•
Identify the hot aisle and cold aisle at the installation site, and make sure ambient air flows into
the switch from the cold aisle and exhausts to the hot aisle.
•
Identify the airflow designs of neighboring devices, and prevent hot air flowing out of the
neighboring device from entering the device.
•
The rack is sturdy enough to support the switch and its accessories.

1-2
•
The rack or workbench is reliably grounded.
To ensure correct operation and long service life of your switch, install it in an environment that meets
the requirements described in the following subsections.
Temperature/humidity
For correct operation and long service life of your switch, maintain the temperature and humidity in
the equipment room at acceptable ranges.
•
Lasting high relative humidity can cause poor insulation, electricity leakage, mechanical
property change of materials, and metal corrosion.
•
Lasting low relative humidity can cause washer contraction and ESD and cause problems
including loose mounting screws and circuit failure.
•
High temperature can accelerate the aging of insulation materials and significantly lower the
reliability and lifespan of the switch.
For the temperature and humidity requirements of the switch, see technical specifications in
Hardware Information and Specifications.
Cleanliness
Dust buildup on the chassis might cause electrostatic adsorption and dust corrosion, resulting in
poor contact of metal connectors and contact points. This might shorten the device's lifetime and
even cause device failure in the worst case. Table1-1 describes the dust concentration limits in the
equipment room.
Table1-1 Dust concentration limits in the equipment room
Substance Particle diameter Concentration limit
Dust particles ≥ 0.5 µm ≤ 3.5 × 106particles/m3
Dust particles ≥ 5 µm ≤ 3 × 104particles/m3
Dust (suspension) ≤75 µm ≤0.2 mg/m3
Dust (sedimentation) 75 µm to 150 µm ≤1.5 mg/(m2h)
To maintain cleanliness in the equipment room, follow these guidelines:
•
Keep the equipment room away from pollution sources. Do not smoke, eat, or drink in the
equipment room.
•
Use double-layer glass in windows and seal doors and windows with dust-proof rubber strips.
Use screen doors and window screens for doors and windows open to the outside and make
sure the external windows are air tight.
•
Use dustproof materials for floors, walls, and ceilings and use wallpaper or matt paint that does
not produce powders.
•
Clean the equipment room regularly and clean the air filters of the rack each month.
•
Wear ESD clothing and shoe covers before entering the equipment room, keep the ESD
clothing and shoe covers clean, and change them frequently.
Corrosive gas limit
Corrosive gases can accelerate corrosion and aging of metal components. Make sure the corrosive
gases in the equipment room do not exceed the concentration limits as shown in Table1-2.

1-3
Table1-2 Corrosive gas concentration limits in the equipment room
Gas Average concentration (mg/m3) Maximum concentration (mg/m3)
SO20.3 1.0
H2S 0.1 0.5
Cl20.1 0.3
HCI 0.1 0.5
HF 0.01 0.03
NH31.0 3.0
O30.05 0.1
NOX0.5 1.0
CAUTION:
As a best practice, control the
corrosive gas concentrations in the equipment room at their
average
values
. Make sure the corrosive gas concentrations do not exceed 30 minutes per day at their
maximum values.
To control corrosive gases, use the following guidelines:
•
As a best practice, do not build the equipment room in a place with a high concentration of
corrosive gases.
•
Make sure the equipment room is not connected to sewer, vertical shaft, or septic tank pipelines
and keep it far away from these pipelines. The air inlet of the equipment room must be away
from such pollution sources.
•
Use environmentally friendly materials to decorate the equipment room. Avoid using organic
materials that contains harmful gases, such as sulfur or chlorine-containing insulation cottons,
rubber mats, sound-proof cottons, and avoid using plasterboards with high sulfur concentration.
•
Place fuel (diesel or gasoline) engines separately. Do not place them in the same equipment
room with the device. Make sure the exhausted air of the engines will not flow into the
equipment room or towards the air inlet of the air conditioners.
•
Place batteries separately. Do not place them in the same room with the device.
•
Employ a professional company to monitor and control corrosive gases in the equipment room
regularly.
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the switch and application
system, adversely affect the switch in the following ways:
•
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, use the following guidelines:
•
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
•
Keep the switch far away from radio transmitting stations, radar stations, and high-frequency
devices.

1-4
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
•
To prevent signal ports from getting damaged by overvoltage or overcurrent caused by lightning
strikes, route interface cables only indoors.
Laser safety
WARNING
!
The switch is Class 1 laser device. Do not stare into any fiber port when the switch has power. The
laser light emitted from the optical fiber might hurt your eyes.
Installation tools
•
Flat-blade screwdriver
•
Phillips screwdriver
•
ESD wrist strap
All these installation tools are user supplied.

2-5
2 Installing the switch
CAUTION:
Keep the tamper
-
proof seal on a mounting screw on the chassis cover intact, and if you want to open
the chassis, contact H3C for permission. Otherwise, H3C shall not be liable for any consequence.

2-6
Figure2-1 Hardware installation flow
Start
Install the switch
Connect the grounding cable
Connect power cords
Verify the installation
Turn on the circuit breakers
Operating correctly? Turn off the
circuit breakers
Resolve the
problem
With expansion slots?
Yes
Yes
No
No
Install expansion cards
Operating correctly
Yes
No Resolve the
problem
End
Connect interface connectors
and cables
With fan tray
slots?
With power
module slots?
No
No
Yes
Yes
Install fan trays
Install power modules

2-7
Installing the switch in a 19-inch rack
Installation methods
Table2-2 Installation methods for the S5560X-EI switches
Chassis Installation
methods Installation requirements Installation procedure
S5560X-30C-EI
S5560X-54C-EI
S5560X-30F-EI
S5560X-30F-EIF
S5560X-54F-EI
S5560X-34S-EI
S5560X-54S-EI
Using front
mounting
brackets
Install the front mounting brackets at
the port side or power module side.
See "Rack-mounting the
switch by using front
mounting brackets."
S5560X-30C-PW
R-EI
S5560X-54C-PW
R-EI
Using front
and rear
mounting
brackets
•Install the front mounting brackets
at the port side or power module
side.
•Install the rear mounting brackets
based on the rack depth.
If the rack depth is in the range
of 429 to 595 mm (16.89 to
23.43 in), orient the bracket
with the wide flange inside the
rack.
If the rack depthis in the range
of 274 to 440 mm (10.79 to
17.32 in) and the distance
from the rear rack posts to the
inner surface of the cabinet
door is longer than 153 mm
(6.02 in), orient the bracket
with the wide flange outside
the rack.
See "Rack-mounting the
switch by using front and
rear mounting brackets."
Figure2-2 Procedure for rack-mounting the switch by using the front mounting brackets
Figure2-3 Procedure for rack-mounting the switch by using the front and rear mounting
brackets
NOTE:
If a rack shelf is available, you can put the switch on the rack shelf, slide the switch to an appropriate
location, and attach the switch to the rack by using the mounting brackets.
Attach the front
mounting brackets to
the switch
Determine the front mounting
bracket installation position (port
side or power module side) Mount the switch
in the rack
Attach the front
mounting
brackets to the
switch
Attach the
shoulder
screws to the
switch
Attach the
rear mounting
brackets to
the rack
Determine the front
mounting bracket
installation position (port
side or power module side)
Mount the
switch in the
rack

2-8
Installation accessories
Table2-3 Installation accessories for the S5560X-EI switches
Switch model Front mounting brackets
(Figure2-4) Rear mounting brackets and shoulder screws (Figure2-5)
S5560X-30C-EI
S5560X-54C-EI
S5560X-30F-EI
S5560X-30F-EIF
S5560X-54F-EI
S5560X-34S-EI
S5560X-54S-EI
Provided N/A
S5560X-30C-PWR-EI
S5560X-54C-PWR-EI Provided Provided
Figure2-4 Front mounting bracket
(1) Screw hole for attaching the bracket to the switch
(2) Screw hole for attaching the bracket to the rack
(3) M4 screw
Figure2-5 Rear mounting bracket and shoulder screw
(1) Screw hole for attaching the bracket to the rack
(2) Shoulder screw
1
2
3
12

2-9
Rack-mounting the switch by using front mounting brackets
Attaching the front mounting brackets to the switch
The S5560X-30C-EI, S5560X-54C-EI, S5560X-30F-EI, S5560X-30F-EIF, S5560X-54F-EI,
S5560X-34S-EI, and S5560X-54S-EI switches provide two installation positions on the side panels
for the front mounting brackets. One is near the power module side and one is near the port side.
To attach the front mounting brackets to the switch:
1. Determine the mounting position for the front mounting brackets.
2. Align the round holes in the wide flange of one front mounting bracket with the screw holes in
the chassis. See Figure2-6 and Figure2-7.
3. Use M4 screws (provided with the switch) to attach the mounting bracket to the chassis.
4. Repeat the proceeding two steps to attach the other mounting bracket to the chassis.
Figure2-6 Attaching the front mounting bracket to the port side
Figure2-7 Attaching the front mounting bracket to the power module side
Mounting the switch in the rack
1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.
2. Make sure the front mounting brackets have been attached securely to the two sides of the
switch.
3. Install cage nuts (user-supplied) in the mounting holes in the rack posts. Make sure the
corresponding cage nuts on the left and right front rack posts are at the same height.
4. One person holds the switch chassis and aligns the installation holes on the mounting brackets
with the cage nuts on the rack posts.
5. The other person attaches the mounting brackets with M6 screws (user-supplied) to the rack.

2-10
Figure2-8 Mounting the switch in the rack (front mounting brackets at the port side)
Figure2-9 Mounting the switch in the rack (front mounting brackets at the power module
side)
Rack-mounting the switch by using front and rear mounting
brackets
Attaching the front mounting brackets and shoulder screws to the switch
To rack-mount the S5560X-30C-PWR-EI and S5560X-54C-PWR-EI switches by using the front and
rear mounting brackets, you can install the front mounting brackets at the port-side or power
module-side mounting position. The following uses port-side mounting as an example. The
power-side mounting is similar.
To attach the front mounting brackets and shoulder screws to the switch:

2-11
1. Align the round holes in the wide flange of one front mounting bracket with the screw holes in
the port-side mounting position on one side of the chassis. See Figure2-10.
2. Use M4 screws (supplied with the switch) to attach the mounting bracket to the chassis.
3. Repeat the proceeding two steps to attach the other mounting bracket to the chassis.
4. Unpack the shoulder screws. Attach the shoulder screw to one of the two installation positions
as red-marked in Figure2-10.
Figure2-10 Attaching the front mounting brackets and shoulder screws to the chassis
Attaching the rear mounting brackets to the rack
1. Determine the switch installation position in the rack.
2. Install cage nuts in the rack posts. Make sure the corresponding cage nuts on the left and right
rear rack posts are at the same height.
3. Orient the rear mounting brackets with the wide flange inside or outside the rack as required.
4. Use M6 screws to attach the rear mounting brackets to the rear posts, as shown in Figure2-11.
Do not fully tighten the M6 screws before mounting the switch in the rack.

2-12
Figure2-11 Attaching the rear mounting brackets to a rack with the wide flange inside the
rack
Figure2-12 Attaching the rear mounting brackets to a rack with the wide flange outside the
rack
Mounting the switch in the rack
1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.
2. Make sure the front mounting brackets and shoulder screws are securely attached to the two
sides of the switch.
3. Attach cage nuts to the front rack posts. Make sure the corresponding cage nuts on the left and
right front rack posts are at the same height.

2-13
4. One person supports the chassis bottom with one hand, holds the front part of the chassis with
the other hand, and pushes the chassis into the rack gently.
Make sure the shoulder screws make close contact with the upper edges of the rear mounting
brackets, as shown in Figure2-13.
5. The other person attaches the front mounting brackets with M6 screws (user-supplied) to the
front rack posts.
Make sure the switch is installed securely in the rack.
Figure2-13 Mounting the switch in the rack (with the wide flange of the rear mounting
brackets inside the rack)
Figure2-14 Mounting the switch in the rack (with the wide flange of the rear mounting
brackets outside the rack)

2-14
Mounting the switch on a workbench
IMPORTANT:
•
Reserve a minimum of 10 cm (3.9 in) of clearance around the chassis for heat dissipation.
•Do not place heavy objects on the switch.
To mount the switch on a workbench:
1. Verify that the workbench is sturdy and reliably grounded.
2. Place the switch with bottom up, and clean the round holes in the chassis bottom with dry cloth.
3. Attach the rubber feet to the four round holes in the chassis bottom.
4. Place the switch with upside up on the workbench.
Grounding the switch
WARNING
!
Correctly connecting the grounding cable is crucial to lightning protection and EMI protection.
The power input end of the switch has a noise filter, whose central ground is directly connected to the
chassis to form the chassis ground (commonly known as PGND). You must securely connect this
chassis ground to the earth to minimize the potential for system damage, maximize the safety at the
site, and minimize EMI susceptibility of the system.
You can ground the switch in one of the following ways, depending on the grounding conditions
available at the installation site:
•
Grounding the switch with a grounding strip
•
Grounding the switch with a grounding conductor buried in the earth ground
NOTE:
The power and grounding terminals in this section are for illustration only.
Grounding the switch with a grounding strip
WARNING
!
•
Connect the grounding cable to the grounding strip
in the equipment room. Do not connect it to a
fire main or lightning rod.
•
To guarantee the grounding effect and avoid switch damage, use the grounding cable provided
with the switch to connect the switch to a grounding strip in the equipment room.
If a grounding strip is available at the installation site, connect the grounding cable to the grounding
strip.
Connecting the grounding cable to the chassis
1. Remove the grounding screw from the rear panel of the switch chassis.
2. Use the grounding screw to attach the ring terminal of the grounding cable to the grounding
screw hole. Fasten the screw.

2-15
IMPORTANT:
Orient the grounding cable as shown in
Figure2-15 so you can easily install or remove the
expansion card.
Figure2-15 Connecting the grounding cable to the chassis
(1) Grounding screw
(2) Ring terminal
(3) Grounding sign
(4) Grounding hole
(5) Grounding cable
Connecting the grounding cable to a grounding strip (1)
This method is applicable to the S5560X-30C-PWR-EI and S5560X-54C-PWR-EI switches.
To connect the grounding cable to a grounding strip:
1. Remove the hex nut of a grounding post on the grounding strip.
2. Cut the grounding cable to a length required for connecting to the grounding strip.
3. Attach a ring terminal to the grounding cable:
a. Use a wire stripper to strip 5 mm (0.20 in) of insulation off the end of the grounding cable.
b. Slide the heat-shrink tubing onto the cable and insert the bare metal part into the end of the
ring terminal.
c. Use a crimper to secure the metal part of the cable to the ring terminal.
d. Slide the heat-shrink tubing down the cable until the tube covers the joint.
e. Use a heat gun to shrink the tubing around the cable.
Figure2-16 Attaching a ring terminal to the grounding cable
4. Connect the ring terminal of the grounding cable to the grounding post of the grounding strip,
and fasten it with the removed hex nut.
5
1 2 3
4
(A)

2-16
Figure2-17 Connecting the grounding cable to a grounding strip
(1) Grounding post
(2) Grounding strip
(3) Grounding cable
(4) Hex nut
Connecting the grounding cable to a grounding strip (2)
This method is applicable to the S5560X-30C-EI, S5560X-54C-EI, S5560X-30F-EI, S5560X-30F-EIF,
S5560X-54F-EI, S5560X-34S-EI, and S5560X-54S-EI switches.
To connect the grounding cable to a grounding strip:
1. Cut the grounding cable to a length required for connecting to the grounding strip.
2. Use a wire stripper to strip 20 mm (0.79 in) of insulation off the end of the grounding cable. Then
use needle-nose pliers to bend the bare metal part to the shape as shown in Figure2-18. Make
sure the bended part can securely attached to the grounding post on the grounding strip.
3. Attach the bended part of the grounding cable to the grounding post and use the hex nut to
fasten the bended part to the post.
Figure2-18 Connecting the grounding cable to the grounding strip
(1) Grounding post
(2) Grounding strip
(3) Grounding cable
(4) Hex nut
Grounding the switch with a grounding conductor buried in
the earth ground
If the installation site does not have any grounding strips, but earth ground is available, hammer a 0.5
m (1.64 ft) or longer angle iron or steel tube into the earth ground to serve as a grounding conductor.
The dimensions of the angle iron must be a minimum of 50 × 50 × 5 mm (1.97 × 1.97 × 0.20 in). The
steel tube must be zinc-coated and its wall thickness must be a minimum of 3.5 mm (0.14 in).
1
43
2
1 2
34

2-17
Weld the yellow-green grounding cable to the angel iron or steel tube and treat the joint for corrosion
protection.
Figure2-19 Grounding the switch by burying the grounding conductor into the earth ground
(1) Grounding screw
(2) Chassis rear panel
(3) Grounding cable
(4) Earth
(5) Joint
(6) Grounding conductor
Installing/removing a fan tray
CAUTION:
•
Install two fan trays of the same model on the switch. Do not power on the switch when it does
not have fan trays or has only one fan tray installed.
•
Do not leave any slots empty when the switch is operating. Install a module or filler panel in the
slots.
•
If both fan trays fail while the switch is operating
, replace them within 2 minutes while the switch
is operating.
•
If one fan tray fails while the switch is operating, perform either of the following tasks:
If the ambient temperature is not higher than 27°C (80.6°F), replace the fan tray within 24 hours and
make sure the failed fan tray is in position before the replacement.
If the ambient temperature is higher than 27°C (80.6°F), replace the fan tray immediately.
•If you power cycle the switch after a fan tray fails, the switch will fail to start up.
S5560X-EI switches except the S5560X-34S-EI and S5560X-54S-EI provides fan tray slots and
support hot swapping of fan trays.
The switch comes with empty fan tray slots. Choose fan tray models for the switch based on the
ventilation requirement of the site. The air flow direction varies by fan tray model.
•
The LSPM1FANSAfan tray draws ambient air into the chassis from the power module side and
exhausts the air through the port side and chassis sides. The fan tray handle is blue.
•
The LSPM1FANSB fan tray draws ambient air into the chassis from the port side and chassis
sides and exhausts the air through the power module side. The fan tray handle is red.
For more information about the fan trays, see Hardware Information and Specifications.
6
5
1 2
3
4

2-18
Installing a fan tray
CAUTION:
To prevent damage to the fan tray or the connectors
in the chassis
, insert the fan tray gently. If you
encounter a hard resistance while inserting the fan tray, pull out the fan tray and insert it again.
To install a fan tray:
1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.
2. Unpack the fan tray and verify that the fan tray model is correct.
3. Grasp the two handles of the fan tray with the side marked TOP facing up, and slide the fan tray
along the guide rails into the slot until the fan tray seats in the slot and has a firm contact with
the backplane.
Figure2-20 Installing a fan tray
IMPORTANT:
•
At the first login to the switch, use the fan prefer-direction command to set the airflow
direction of the switch to be the same as the airflow direction of the fan tray.
If the fan tray has a
different airflow direction than the switch, the system outputs traps and logs to notify you to
replace the fan tray.
•
By default, the switch uses the same airflow direction (port-to-power) as the LSPM1FANSB fan
tray.
Removing a fan tray
WARNING
!
•
To avoid bodily injury, disturbing the dynamic balance of the fan tray, and causing loud noises, d
o
not touch the rotation axis, or any bare wires, fan blades, or terminals on the fan tray.
•
Do not place the fan tray in a moist place. Prevent liquid from entering the fan tray.
•
Fan trays with faulty internal wiring and conductors require maintenance from maintenance
engineers. Do not disassemble the faulty fan trays.