B&R Mobile Panel 40, Руководство пользователя, Страница: 19 / 142

Technical data
Mobile Panel 40/50 User's manual V1.80 19
2.2.2 Enabling devices
Enable switch
Enable switch
Figure 4: Enabling devices
The Mobile Panel is equipped with two enable switch es that are arranged on both sides of the device . It allows both
left- and right-handed operation. Both enable switch es are connected in parallel and have the exact safe effect on
the shared safety circuits in the attachment cable. Only one enable switch must be enabled. The enable switch
consists of a three-position control element and separate evaluation electronics. An important feature is the uniform
dual-circuit design that spans everything from the control elements to the connection terminals . The evaluation
circuits have been implemented using various technologies and switching circuitry. The electronic design of the
switching contacts means that their service life remains independent of the load up to their rated values (resistive,
inductive and capacitive).
Enable
switch elements are protected against reverse polarity. The outputs of both circuits are protected against
short circuit and overload:
• Circuit 1: Thermal protective circuit
•
Circuit 2: Foldback characteristic curve
2.2.2.1 Functionality
The control element is composed of two symmetrically arranged rocker switch es, the position of which is determined
using electrical sensing devices before being passed on to the evaluation electronics.
The enable
switch can have three different switch positions:
Switch position Function Enable switch Switching contact
1 Zero position Not actuated Off (opened)
2 Enable Actuated On (closed)
3 Panic Fully actuated Off (opened)
Table 6: Enable switch positions
wird nicht betätigt wird betätigt
Null Zustimmung Panik
Null Zustimmung Panik
Kanal 1
Kanal 2
wird durchgedrückt
Figure 5: Possible enable switch positions
Warning!
The enable switch must be tested periodically (every 6 months) by switching it to the panic position.
This test must be performed to determine whether the panic position is functional.
Information:
Only one enable switch must be actuated for the monitoring device to determine that the switch posi-
tion is in order.
Positions "Zero" and "Panic" must trigger a category 0 or 1 stop command.
2.2.2.1.1 Zero position
When not actuated, the enable switch returns to the zero position (not enabled).