Banner DUO-TOUCH Two-Hand Control Modules - Manual (Page 7)

P/N 47550 rev. E
7
DUO-TOUCH
® – Models AT-..M-2A Two-Hand Control Modules
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Connection of Power to the DUO-TOUCH Safety Module
The Safety Module requires a 24V dc, 115V ac or 230V ac supply voltage (see
Specifications on page 11). Use extreme caution whenever installing ac power. Use a
minimum of 16 to 18 AWG wire for power and output connections. A hand-operated
supply disconnect (e.g. a circuit breaker) must be provided (per NFPA79 and IEC/
EN60204).
Connection to the Machine to be Controlled
Figure 5d shows a generic connection of the Safety Module’s two redundant output
contacts to machine primary control elements MPCE1 and MPCE2. An MPCE is
defined as an electrically-powered element, external to the safety module, which
directly controls the machine’s normal operating motion so that it is the last (in time)
to operate when motion is either initiated or arrested. Some older machines offer only
one MPCE; for such machines, it may be necessary to add a second MPCE to establish
the appropriate level of safety integrity.
The connection of the safety outputs must be in such a manner that the stop command
issued by the AT-..M-2A can not be overridden by a device or circuit that is not at the
same level of safety integrity. This means that the safety outputs are interfaced on
the output of the machine logic (e.g., PLC or PC). Then, normally, a feedback signal
identifies to the machine logic the status of the Safety Module and, if possible, the
status of the MPCEs. If interposing relays are used, they must be of mechanically
linked (forced-guided) design and monitored by the MPCE Monitoring Circuit (X1/X2).
As shown in Figure 5d, a normally-closed, mechanically linked monitor contact from
each of the two MPCEs must be connected in series across terminals X1 and X2.
This allows the Safety Module to monitor the state of the MPCEs, and to prevent a
successive machine cycle, if an MPCE fault is detected. There is a timing requirement
associated with the operation of X1 and X2 inputs. The monitoring contacts of external
relays must close within 200 ms following deactivation of the AT-..M-2A outputs. If this
requirement is not met or an internal fault is detected, the unit enters a lockout mode
(indicated by Fault LED ON Red). A power cycle is required to exit the lockout. See
Figure 4 and Caution on page 10.
When MPCE monitor contacts are not available, a jumper wire must be installed
across terminals X1 and X2.
When a jumper wire is used (dotted line between X1 and X2 in Figure 5d), it is the
user’s responsibility to provide an appropriate level of safety for the means of machine
interfacing to ensure that any single MPCE component failure will not result in the loss
of safety.
When switching inductive ac loads, it is good practice to protect
the Safety Module outputs by installing appropriately-sized arc
suppressors. However, if arc suppressors are used, they must
be installed across the load being switched (e. g., across the
coils of external safety relays), and never across the Safety
Module’s output contacts (see WARNING on page 8).
CAUTION ... Disconnect
Power Before Wiring
Always disconnect all power
from the DUO-TOUCH Safety Module
and the machine being controlled before
making any wire connections.
Electrical installation of hand controls, the
DUO-TOUCH SG Safety Module, and the
interconnection to the machine control
must be made by qualified personnel and
must comply with NEC (National Electrical
Code), ANSI/NFPA79 or IEC60204-1, and
all applicable local standards.
WARNING ...
Use of
Electronic Hand Controls
Electronic (powered) hand controls
include optical touch buttons, capacitive
touch buttons and similar devices. When
electronic hand controls are used as
input switches for a DUO-TOUCH Safety
Module, the hand controls and the Safety
Module must be powered from the same
voltage source. Failure to do so creates
a potentially dangerous condition, which
could result in serious injury or death.
If power is applied to the Safety Module
before power is applied to the electronic
hand controls, an output from the DUO-
TOUCH Safety Module could result and may
trigger machine motion. Also, electronic
hand controls cannot guarantee the state of
their outputs at the time power is applied
to them.
!
Power
Feedback
(X1-X2)
Input 1
Input 2
Output
200 ms
200 ms 200 ms
closed
open
EDM Error
(Red LED ON)
Lockout No Lockout –
Normal
Operation
Lockout Recovery
Figure 4. X1 and X2 Input timing requirements