22
P/N 133487
Banner Engineering Corp.
•
Minneapolis, U .S .A .
www .bannerengineering .com • Tel: 763 .544 .3164
SC22-3 Safety Controller
Instruction Manual
System Installation
3.5 Safety Input Functions
3.5.1 Internal Logic
The Controller’s internal logic is designed so that a safety output
can turn ON only if all the controlling safety input device signals
and the Controller’s self-check signals are in the Run state
and report that there is no fault condition . The following table
illustrates the internal logic .
Safety Input
1
Safety Input
2
Safety Output
1
Stop
Stop
OFF
Stop
Run
OFF
Run
Stop
OFF
Run
Run
ON
This table illustrates the logic for two safety input devices that
are mapped to control Safety Output 1 . If any of the safety input
devices are in the Stop state, the safety output will be OFF .
When both safety inputs and the Controller are in the Run state,
then Safety Output 1 will be ON .
3.5.2 Two-Hand Control (THC)
The two-hand control function requires that two hand actuators
each be activated within 0 .5 seconds of each other in order to
produce a Run signal to start a machine cycle . THC devices are
always the last input (in time) to turn the safety output ON . If
one or more of the other controlling input devices are configured
for manual reset and are used to stop the machine, a manual
reset must be performed before the THC device can cycle the
machine again . See Section A .5 for more information .
Two-Hand
Control Device
Safety Device 2
(Manual)
Reset Signal
Safety Output
Figure 3-3. Two-hand control device and manual reset safety
input device timing logic
Two-Hand Control Activation on Power-Up Protection. The
Controller’s two-hand control logic will not permit the assigned
safety output to turn ON when power is initially supplied while
the THC actuators are in their Run state . The THC actuators
must change to their Stop state and return to the Run state
before the safety output can turn ON .
A two-hand control device does not have a manual reset option .
3.5.3 Enabling Devices
Enabling Device. The enabling device actively controls the
suspension of a Stop signal during a portion of a machine
operation where a hazard can occur . The enabling device
permits
a hazardous portion of the machine to run, but must
not start it . A separate machine command signal from another
device is needed to start hazardous motion . This enabling
device must have ultimate hazard turn OFF or Stop authority
when being used. The enabling device is sometimes referred to
as the “live man pendant .”
An enabling device can be mapped to one or more safety
outputs . When the enable signal goes from the Stop state to the
Run state, the Controller will go into Enable mode . In this mode,
the associated safety outputs will turn ON if any of the assigned
EDM inputs are closed (these may open after the outputs turn
ON) and all of the controlling E-stop or rope pull devices are
in their Run state . With the exception of the E-stop and rope
pull devices, all other safety input signals (Run or Stop) will be
ignored while the Controller is in Enable mode . Safety output
enabling control resides in the enabling device function when
in Enable mode . In order to exit Enable mode, the enabling
device must be in the OFF state, and a system reset must be
performed . See Appendix A .9 for more information .
Enabling Device Time Limit. The enabling device time limit
can be adjusted between 1 second and 30 minutes and
cannot
be disabled
. When the time limit expires, the associated safety
outputs will turn OFF . In order to start a new Enable mode cycle
with the time limit reset set to its original time limit value, the
enabling device must switch from ON to OFF, and back to ON .
All ON- and OFF-delay times associated with the safety outputs
that are controlled by the enabling device function will be
honored during the Enable mode .
Enable Device
Safety Device
Safety Output
(ON-Delayed)
System Reset
Enable Mode
ON-Delay
ON-Delay
ON-Delay
ON-Delay
Don’t Care*
Don’t Care*
Enable Mode ON
Enable Mode ON
*Unless it’s an E-Stop or a Rope-Pull
*Unless it’s an E-Stop or a Rope-Pull
Enable Mode OFF
Enable Mode OFF
Figure 3-4. Enabling device and enable mode timing logic
