User Manual

SAFETY
Safety handbook page - 25 -
PNSPO
One of the main requirements for electrical Two – Hand control units is the
synchronous actuation. illustration 6.1 describes this function.
The EN 574 describes in detail that a two hand control station must be designed to
prohibit several kinds of defeat.
EN 574, Clause 8 describes the prevention of accidental actuation and of defeat.
The normative Annex A shows measurement tests for the prevention of defeat.
Prevention of defeat using one arm:
- Separation of the control actuating devices (inside dimensions ) by at least 260mm
- Separation of the control actuating devices by one or more shields in an elevated
area designed, in such a way that the control actuating device cannot be touched
with the ends of a 260 mm cord representing the finger span.
- Separation of the control actuating devices by collars and by orientation in such a way
that the control actuating device cannot be touched with the ends of a 260 mm cord.
time
1 st. hand
2 nd hand
t 0
,
5s
time period of simultaneous actuation
simultaneous
actuation
Cessation of
the input
Initiation of the 1. input signal
Initiation of the 2. input signal
illustration 6. 1 Simultaneous actuation for two-hand type IIIa - IIIc
Distance ≥ 260mm