Table of Contents
Advertisement
Because the DUO-TOUCH SG Safety Module interfaces to many types of ma chine
controls, it is not possible to give exact wiring instructions here. The following guide-
lines are gen er al in nature.
Connection of Input Switches
The STBs are connected to the Duo-Touch SG module as shown in Figures 5a and
5b (page 9). STB1 and STB2 both have one normally open and one normally closed
output contact each, or two current-sourcing complementary outputs each, all capable
of reliably switching 10-20 mA. Connect one STB to terminals S11, S12, S13 and the
other to terminals S21, S22 and S23. If STBs with PNP outputs are used, the system
must be supplied with 24V dc. Wire gauge for the switch connections is not specified.
Connection of Power to the DUO-TOUCH SG Safety Module
The Safety Module requires a 24V ac or dc supply voltage. Power consumption of the
Safety Module is approximately 4,5 VA. Use extreme caution when ev er in stall ing ac
power. We recommend to use 1,2 to 1,7 mm
hand-operated supply disconnect (e.g. a circuit breaker) must be provided (per IEC/EN
60204). If activation devices other than STB Touch Buttons are used, they must share
the same voltage supply with the Safety Module (see WARNING on page 9).
Connection to the Machine to be Controlled
The wiring diagrams (Figures 5a and 5b) show 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
DUO-TOUCH SG, 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 is necessary to add at
least a second MPCE to establish control reliability. See: "NOTICE Regarding Machine
Interface", on the right. As shown in Figures 5a and 5b, a normally-closed forced-
guided monitor contact from each of the two MPCEs must be connected in series
across ter mi nals Y1 and Y2. This feedback loop allows the circuit of the Safety Mod ule
to monitor the state of the MPCEs, and to prevent a successive machine cycle, if an
MPCE fault is detected. When MPCE monitor contacts are not available, a jumper wire
must be installed across terminals Y1 and Y2.
IMPORTANT: When a jumper wire is used, it is the user's responsibility to provide a
control-reliable means of machine interface, (per EN 954/ISO 13849), to ensure that
any single MPCE com po nent failure will prevent a successive machine cycle.
The outputs of the DUO-TOUCH SG Safety Module are rated at 250V ac/dc max i mum,
at 6 amps max i mum resistive load. Force-guided Safety relays may be installed between
the outputs of the Safety Module and the MPCEs to increase switching capacity.
Whenever a safety relay is added as an intermediate switching device, a normally-
closed force-guided monitor contact of that relay must be added to the series feedback
loop between Safety Module ter mi nals Y1 and Y2.
When switching in duc tive ac loads, it is good practice to protect the Safety Module
outputs by installing ap pro pri ate ly-sized arc sup pres sors. However, if arc suppressors
are used, they must be in stalled 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 9).
8
page
®
DUO-TOUCH
Electrical Installation
2
wire for power and output connections. A
SG –
Two-Hand-Control Kits with STB Touch Buttons
CAUTION
Disconnect Power
Before Wiring
Always disconnect all power
from the DUO-TOUCH SG Safety Module
and the ma chine being controlled before
making any wire connections.
Insulation of hand controls and associated
wiring must be rated for 250V ac
minimum. If the hand controls have
metal housings, the housings must be
connected to protective earth ground.
Electrical installation of hand controls
must be made by a qualified electrician
and must com ply with IEC/EN-60204-1, -2
and all applicable local standards.
NOTICE
Regarding the
Machine In ter face
The DUO-TOUCH SG Two-Hand-Control
Safety Module has two redundant output
channels for in ter fac ing to the machine
primary control elements. Some machines
have only one control element; for such
ma chines, it is necessary to du pli cate the
cir cuit of the single control element.
According to EN 954/ISO 13849 Control
Reliability, the device, system, or interface
must be de signed, constructed, and
installed so that a single component
failure will not prevent normal stopping
action from taking place but will pre vent a
successive machine cycle.
In the case of part-revolution clutch
machinery, each machine control element
must be ca pa ble of immediately stopping
the dangerous machine motion, irrespec-
tive of the state of the other el e ment. For
full-revolution clutch machinery, each
machine control el e ment must be capable
of preventing a sub se quent cycle, irre-
spec tive of the state of the other element.
The slower of the two machine control
ele ments must be used when calculating
safety dis tance for the hand controls. (See
"Mechanical Installation of Hand Controls",
page 6 and Warning on page 9.)
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
...
Advertisement
Table of Contents
