Leuze MLC 530 SPG, Original Operating Instructions

Page: 46 / 105

Applications
Leuze electronic GmbH + Co. KG MLC 530 SPG 46
CS
TH
PFI
GA
T2
t1
s1
s2
t 2 t3
T1
CS Switching signal from the control
TH Timer hold signal from the control
PFI Protective field violation
GA Gating active
T1 Start of the gating sequence
T2 Gating end
t1 Time difference between the CS switching signal and the protective field violation: < 4 s
s1 Distance traveled after activation of the CS switching signal until interruption of the protective field: < 200 mm
t2 Time difference between clearance of the protective field and automatic gating end: 2 s
s2 Distance traveled after clearance of the protective field until automatic gating end: < 200 mm
t3 Time difference between gating end and switching-off of the CS switching signal/activation of the timer hold
signal: < 20 s
Fig. 6.4: Signal sequence during transport out of a danger zone
6.1.2 Inward transport of pallets
Description
• Euro pallets with drinks crates are transported in longitudinal direction into a film wrapping machine
(wrapper).
• Required Performance Level: PL d
• To detect an incoming pallet, two sensors are mounted: PS1 and PS2.
• The sensors are mounted so that both simultaneously detect the pallet at a distance < 0.2 m in front
of the protective field of the safety light curtain.
• Both sensor signals are tested in the control for simultaneity (300 ms). It is not possible for one per-
son to actuate both sensors simultaneously within such a short time while the transport system is
running.
• Together with the "transport system running" signal, the evaluated simultaneity signal generates the
switching signal CS for starting the SPG cycle.
• Conveyor speed: 0.3 m/s.
• Automatic gating end not possible
• Gating termination required by the control
• Operating mode 5 without TH timer hold signal is used (see chapter 4.4.3 "Operating mode 5 - Stan-
dard").
• Entry of the pallet into the wrapper is not interrupted once started until the pallet is in the wrapping
position within the danger zone.
• A timeout extension is not necessary. The timer hold signal TH is permanently switched to OFF.