Holding Brakes Note Regarding The System's Safety - Bosch Rexroth MKE Series Project Planning Manual

Project Planning Manual | Rexroth MKE Synchronous Motors
DANGER
9.11.3

Holding Brakes Note Regarding the System's Safety

Control of the holding brake during
operation (recommendation)
Personal injury through hazardous movements caused by falling or de‐
scending axes!
Secure vertical axes against falling or descending after disconnection:
● lock the vertical axes mechanically,
● provide an external braking / collecting / clamping device, or
● ensure sufficient equilibration of the vertical axes.
The serially delivered holding brakes which are driven by the control device are
not suited for personal safety!
Ensure protection of persons by superordinate fail-safe measures.
Cordon off the hazardous area by means of a safety fence or a safety screen.
Observe supplementary standards and recommendations.
For European countries:
● EN 954 and ISO 13849-1 (2003) and ISO 13849-2 (2007)
Safety-related components of controls
● "Vertikalachsen" Leaflet on vertical axes (Editor: Süddeutsche
Metall - Berufsgenossenschaft Fachausschuss Eisen und
Metall II, Wilhelm–Theodor–Römheld-Str.15, 55130 Mainz,
Germany)
For US:
● See National Electric Code (NEC), National Electrical Manu‐
facturers Association (NEMA) as well as local building regu‐
lations.
The following is generally valid: Comply with all applicable national
regulations!
The permanent magnetic brake is no safety brake. This means, a torque re‐
duction by non-influenceable disturbance factors can occur (see EN 954 and
ISO 13849-1 (2003) and ISO 13849-2 (2007) or the leaflet about vertical axes
SMBG).
Please pay particular attention to the following:
● Corrosion on friction surfaces, as well as dust, perspiration and sediments
reduce the braking effect.
● Grease must not hit the friction surface.
● Over voltage and too high temperatures can weaken the permanent mag‐
nets and therewith the brake.
Engaging of the brake is no longer ensured, if the air gap between armature
and pole is improperly increased due to deterioration. In this case, no braking
occurs.
Malfunctions that occur in the course of the operating period and that may
change the design parameters or the operating conditions, must be recognised
and eliminated within an appropriated period of time. For this case, we recom‐
mend to check the function and the state of the holding brake in regular time
intervals (see chapter 9.11.5 "Holding Brake–Commissioning and Maintenance
Instructions" on page 92).
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