HOT FLUID/OIL sensor & shut down is an item that has been missed by some elevator personnel
for new hydraulic elevator installations or modernization that is in the 2010 and 2013 elevator
code. This can be missed in engineering
and ordering or it can be missed when installing the equipment due to the newer
requirement and not being familiar with the new rule. As inspectors we should be testing this
feature as well during take ins.
In the pump motor controller for electro hydraulic
elevators, when the occurrence of a single ground or the failure of any single
magnetically operated switch, contactors, or relay; or any single solid state
device; or software-system failure causes the liquid in the hydraulic driving
machine to rise in temperature above its maximum operating temperature, the
following shall occur:
a.Power shall be removed from the
hydraulic driving-machine motor
b.The hydraulic driving-machine motor
shall not be permitted to restart
c.When the doors are closed, the car
shall automatically be brought to the lowest landing and then operate in
conformance to 188.8.131.52 and 184.108.40.206.
City of Chicago – The City of
Chicago is on the 2007 elevator code right now so this requirement is not
Everywhere else in the
State of Illinois – This has been required since the
adoption of the 2010 code which was some time ago. The State of Illinois is on
the 2013 code currently.
Reason for the
requirement – It is to prevent the elevator from running while the
oil is thin which will result in level issues and cause a potential trip and
What temperature should
HOT FLUID be set at? You should look at the hydraulic
fluid MSDS and find the correct temperature.
Many people use 135 degrees as a good starting point. If you use an organic fluid it may be lower
or higher, do research for whatever hydraulic fluid you are using so you can set the temperature properly.
I was at a Condo building on Friday to visit with a
Condominium who had a ESCO Elevator from 1968.
The building had been having some issues with the elevator not opening
the doors at the floor during the first few runs in the day. The information I
got when I met with the building was sparse but they told me what the person
who was fixing the elevator was doing to remedy the calls, something didn’t
line up. One of the issues was by the
time the elevator technician got to the building the elevator was working
properly. So I asked more questions.
They had been working with an independent company since
1968 which had been purchased by an intergalactic elevator company/OEM. When the transition of the company
integration took place they had the same maintenance technician that would come
and talk with them before and after working on the elevator system.
Recently they have a new technician who does not
communicate with the building and they have on going issues, which means more
call backs. The person does not call
before he gets there or let anyone know he is leaving. There are no maintenance
records in the elevator room so the building has no idea what is going on. There
is no communication so the building ends up leaving everyone at this intergalactic
company many messages which may add to the confusion.
After asking a few more questions it seems that the person
going to the building may not be familiar with the elevator equipment in their
building and the elevator equipment is in need of replacement.
We have discussed this topic in the past, it is very
important for buildings to find a contractor that will meet their
expectations. If a building wants
someone to the building once a month, find a contractor that will come once a
month. If a building wants to have
maintenance records in the elevator machine room find a contractor that will
provide records in the machine room.
Many companies have moved away from leaving any evidence they had been
at the building, when they go to the building, what they did at the
building. The elevator code indicates
that this information is required to be available to elevator personnel[elevator
inspectors, mechanics & competitors] when they are in the elevator machine
I recently audited four elevators for a larger organization
and the maintenance service provider had been to the building for maintenance
2-4 times for the year. The building was
getting billed $20,000 to $30,000 a month for service calls. Some buildings might be fine with this; the
question is what is right for your building?
And what are you paying for? And
what do you want from your elevator maintenance company? The building I assisted in the audit for was
not very happy about only having 2-4 visits which they thought they were paying
for monthly visits. This particular building should have
someone there twice a month because the building is rough on their elevators
and the maintenance contractor can correct small issues before they become
large issues. The building will still get bills but with preventative maintenance we can help curb the large expenses.
Elevator modernization planning - Back to the Condo, we also spoke about the building
replacing their elevator equipment.
Hiring a new company to take care of an older elevator may or may not
resolve all of the issues but the reality is that the elevator equipment is almost
50 years old and the building should have a plan for replacement. No one likes spending money but I got the
building decision makers to understand that they need to address their elevator
equipment and we will have a meeting very soon so I can show them what needs to
Our trade is very important and can get expensive, we need to be able to communicate with decision makers and owners
who may not fully understand elevators so they know what they are paying for
and why they need to have elevator maintenance and plan for equipment replacement.
Many of the buildings we maintain have replaced their safe
edge door protection with door scans but we still stumble across a few that
have not. If you still have a safe edge,
get it replaced!
What is a elevator
safe edge? An elevator safe
edge is a “boot” that is on the leading edge of the elevator car door that will
come into contact with an object and retract when it hits someone or
something. This piece of technology and
equipment worked very well for many years.
The issue with this device is that it physically needs to hit something
before it retracts and over the years the adjustment on the microswitch which
is the component that tells the elevator door to reopen may be worn out. As elevator door operators get older we lose
the ability to adjust door speed to be reliable and safe.
What is a door
scan/full door protection unit? A door scan/full
door protection unit is a device that works just like your device that prevents
the garage door from hitting your car when it is going out of a garage. The elevator door protection unit has beams
that go up and down the length of the elevator car door. If the device detects and obstruction in the
elevator car doors path it will reopen the door before hitting the person or
Why replace the safe
edge? One of the most
common “accidents” or cause of injury in elevators is the door hitting
people. This device can be replaced for
a reasonable cost and it will reduce the possibility from someone getting hit
by the door.
How long does a full
door scan last? We have been
installing door scans for quite some time, some last 5 years and some last 20
years depending on how much use the elevator gets and what kind of use the
elevator gets. I would ball park that
the average door scan will work 10-15 years.
The door scans are electronic and do get hit and jarred during the use
of the elevators.
How much does a door
scan cost? Call your elevator
maintenance provider, a door scan should cost anywhere between $1,500.00 to
$3,000.00 to install. This device is
well worth the investment.
3D door protection – There are newer
3D devices that can provide additional protection. The devices are not perfect but they do have
some really good benefits. The 3D door protection device is great for any building with slower moving people or children.