Safety Device Options for Sectional Overhead Doors
Sectional Overhead Door
Operation & Safety Device Choices
Presented by Anglia Door Systems Ltd
Images courtesy of www.alpha-deuren.nl
Manual Chain Hoist
Ideal for doors that are not used
frequently and suitable for
sectional doors upto 30m2, a
chain hoist requires only
moderate physical exertion to
open the doors.
However, Safety Brakes must be
fitted to ensure that the chains
cannot cause injury should the
door cables break.
Dead man’s switch - Electric
For infrequent use, with the
Dead man’s switch, one push of
the button will open the doors.
To close the doors, the operator
must keep the button pressed. If
the button is released the door
movement will stop.
This enables the operator to
ensure that no objects/people
come into the opening during the
Touch control - electric
If the doors are in frequent use, a
touch control may be your best
The door raises or lowers at the
touch of a button, without having
to keep the button depressed.
The doors are electronically
adjusted to stop in a set position.
An obstacle detection system is
built into the door’s bottom rail,
to automatically raise it should an
object be detected.
One touch with remote control
Allowing the fork lift driver to
remain seated whilst the doors
are operated, and saving time,
the touch control system also has
the option of remote control
This option includes a stationary
photoelectric safety sensor fitted
to the door that will stop the
door should the light beam be
Touch control with remote control
If the doors are in constant use,
and fitted with a high speed
motor, a touch control with
remote control is an ideal
solution. The doors raise and
lower automatically to
electronically adjusted positions.
An obstacle detection system is
built into the doors bottom seals,
and photocell detection can also
Control box features
There are a variety of top quality
controls that can be integrated in
your door’s control box.
Numerous elements can also be
mounted on an interior or
exterior wall, a pillar or anywhere
in close proximity to the door,
including safety devices,
switches, warning lights and
Motor with emergency chain
All drive systems have a
mechanical backup system to the
reduction gearbox of the electric
motor, allow the sectional door
to be opened in the event of an
The backup system is activated
and deactivated manually using
pull cords and the reduction gear
can then be powered by the
Motor with release system
The motor can also be fitted with
a release system.
Cables are used to disconnect the
reduction gearbox from the
spring shaft, allowing the
sectional door to be opened
more quickly in the event of a
Doors fitted with a release
system must be fitted with a
spring break safety device.
Main switch with padlock
As well as an electricity isolation
switch, the main switch can used
to turn the power off, so that the
door system can be safely
Securing the switch with a
padlock prevents an
unauthorised person from
accidently turning the power
back on whilst the doors are
being worked on.
The key switch is used to disable
the control box, and therefore
the doors, to prevent
unauthorised people from
operating the door.
Only authorised key holders can
activate the doors.
Two setting switch
You can use this switch to
configure two settings. For
example, pushing the button
once can cause the door to open
enough for people to pass
through, or pushing the button
twice to open the doors fully.
This option is ideal if you don’t
always need to open the door
completely, and it saves energy.
In the UK, in addition to other
safety devices, an emergency
stop button is required.
When pressed this will isolate
power from the control box, and
stop the doors in their current
Normally, the control box and the
connection box on the door panel
are connected via spiral cables.
These cables can become
damaged over time, requiring the
cables to be replaced.
An alternative option is a battery
powered transmitter, that send
signals to the control box.
Extra control features
In addition to the controls
already described, there are a
number of optional control
features that can be added.
Extra control panel
If the door needs to be operated
from multiple places or even
remotely, such as from a security
point, an additional control panel
can be fitted.
This handy ‘up-stop-down’ panel
features all the buttons in the
standard control box.
Traffic and warning lights
Traffic lights and warning lights
installed on either side of the
door are an effective way of
preventing injury to people and
damage to the doors or goods
Warning lights alert people and
light up before the door opens,
while traffic lights control the
traffic and prevent damage to the
The door can be operated using a
separate key switch, which can be
mounted on an exterior wall.
There are two models: the built-
in version, which is used a lot in
new properties, and the mounted
version, which can be installed
during a renovation without
having to break or dismantle
If access to a door is required
24/7, it can be fitted with an
This can be handy if transport
and courier companies need to
have round-the-clock access to
secure collection or delivery
The fork lift driver can use the
pull switch to operate the door
while staying seated.
This is the ideal solution if you
have a lot of employees, but
don’t want to give all of them a
hand transmitter for the door.
The pull switch is often mounted
on a frame a few metres in front
or behind the door.
The control box contains a
receiver, making it easy to
upgrade the door system to a
remote control one.
You can choose between one,
two or four-channel transmitters,
allowing the transmitter to
operate up to four different
Mechanical safety devices
The Workplace (Health, Safety
and Welfare) Regulations 1992
require that sectional doors be
equipped with safety devices that
will prevent the doors from
coming down and coming into
contact with people, vehicles or
European standard EN-13241-1
requires that doors may never
descend without being controlled.
All manually operated sectional
doors must therefore be fitted with
a spring break system. This device
blocks the spring shaft in the event
of the spring breaking. With motor
driven doors a spring break is not
necessary as there is a self-locking
gearbox. However spring breaks
must be fitted where there is a
manual override system in place.
Cable break safety device
Sectional doors are operated by the
raising and lower of cables affixed
to the bottom of the door. Should
one or both of the cables break,
the door will come crashing down.
A cable break system will prevent
the doors from coming down
should either cable break.
Safety breaks are fitted as standard
on all new door installations, and
can be easily fitted to older doors
that don’t have them.
Sectional doors are suspended on
flexible cables, making it possible
to raise them when they are
unlocked. Designed especially for
light, automatically operated
doors, the locking system
prevents this. Without it,
sectional doors are more
vulnerable to break-ins.
Manually operated doors are
fitted with a spring-loaded
mechanical slide lock as standard.
Electronic safety devices
Along with mechanical safety
devices, electronic safety devices
provide an additional level of
resettable safety to your door
Slack cable devices
A slack cable device is a micro
switch attached to the cables on
either side of the door.
Should one of the cables become
slack or breaks, the motor is
immediately disabled preventing
the door from operating.
Standard safety edge
The safety edge device is integrated
with a transmitter and receiver in
the doors bottom rubber seal.
If the signal is broken by an object
or person coming into contact with
the seal, the door will stop and
The maximum contact pressure is
40kg, however you can choose a
predictive safety edge if you have
products that cannot withstand
that level of pressure.
Predictive safety edge
The predictive safety edge is
located 8cm below the door. If
the bottom of the door
approaches an obstacle, a signal
is immediately sent to the motor
and the door stops and reopens.
This means the safety edge works
without coming into contact with
people, goods or vehicles.
Photoelectric safety sensor
Motors with touch control must
have a photoelectric safety device
if the door opening is not visible to
users while they are operating the
door. There are two types, a model
with a transmitter and reflector
and a model with a transmitter and
receiver. In both systems there is a
transmitter attached to the rail on
the control box side and a reflector
or receiver attached to the rail on
the opposite side. If the beam is
broken, the motor will stop and
reverse opening the door.