Bosch Rexroth VM350 Manual page 32

32/112 Bosch Rexroth AG
Boundary conditions:
• 24 V supply from an internal power pack
• emergency OFF operating device
according to ISO 60947-5-1.
• The maximum line length for the
emergency OFF circuit is 30 m.
• The emergency OFF must be designed as
a system emergency OFF in accordance
with DIN EN ISO 13849.
• The emergency OFF operating devices
and emergency OFF switchgears (e.g.
PNOZ) must be switched and inspected
regularly according to the device
description.
• Safety-relevant cables that are moveable
must be short-circuit and cross-fault
proof.
• The internal supply for the emergency
OFF function is designed as an PELV.
• The cables and lines (visual inspection),
as well as the function of the emergency
OFF circuit, must be checked at regular
intervals.
Case A:
Emergency OFF switch directly connected to
the contacts for the emergency OFF:
• The tightening spindles are stopped by
the servo amplifiers and the internal
automatic cutouts for the individual servo
amplifiers are opened when the S1
emergency OFF switch is activated. This
tightening job abort leads to an error
message in the controller. Restarting is
possible after closing switch S1 and
acknowledging the error message.
VM350 | 3 609 929 B32/2008-09
Case B:
Use of an emergency OFF switch device, e.g.
PNOZ:
• The cut-out of the emergency OFF circuit
in the emergency OFF switch device
results in the same function as described
under A. Restoring the free contacts from
the internal automatic cutouts to X1, X2 is
not necessary.
• Variant 1: These contacts are bridged if
the emergency OFF switch device is used
exclusively for the tightening system.
• Variant 2: If further movements must be
queried, e.g. feed slides, etc., they will be
returned as usual via X1, X2.
Case C:
The following boundary conditions apply in
this operating mode:
• When an emergency OFF is triggered
(mains supply interrupted), the external
24 V supply must not be switched off as
otherwise data may be lost.
• The external 24 V supply may not be
generally switched in order to avoid high
starting currents (on the secondary side).
• When an emergency OFF is triggered
(mains supply interrupted), no CW/CCW
should be set, as this can lead to system
errors.
• The maximum line length between power
pack and VM350 must not exceed 5 m.
• Triggering the emergency OFF (mains
switching) is subject to the same time
intervals as the switching on the mains.
After the return of the mains power supply,
wait approx. 10 s before setting CW/
CCW.