Product description
INTORQ | BA 14.0215 | 07/2019
11
3
Product description
3.1
Proper and intended usage
3.1.1
Standard applications
INTORQ components are intended for use in machinery and facilities. They may only be used for pur-
poses as specified in the order and confirmed by INTORQ. The INTORQ components may only be oper-
ated under the conditions specified in these Operating Instructions. They may never be operated beyond
their specified performance limits. The technical specifications (refer to Technical specifica-
tions, Page 14) must be followed to comply with the proper and intended usage. Any other usage is con-
sider improper and prohibited.
3.2
Layout
The BFK455-25 spring-applied brake is a double-disc brake with four friction surfaces. The braking torque
is applied through two separate braking circuits, both electrical and mechanical, via several compression
springs in the form of friction locking. The brake circuits are released electromagnetically. Due to its divi-
sion into two brake circuits, the brake is particularly suitable for applications such as lift systems and
stage/platform technology. The brake can be selected based on the rated torque for one brake circuit. The
second brake circuit meets the requirement for redundancy (refer to Rated data for coil power, Page 15).
The division of the brake circuits is done using two separate armature plates with their corresponding com-
pression springs and electromagnetic coils. Each brake circuit can be operated individually due to the sep-
arate supply lines for each stator and armature plate (siehe Switching suggestions for the
BFK455-25, Page 38).
Each brake circuit has a micro-switch which monitors the switching state of the spring-applied brake. Us-
ing the associated switching device, the supply voltage (AC voltage) is rectified and, when the brake is re-
leased, lowered after a short period of time. This results in a reduction of the average electrical power of
the brake.
The stator is designed to comply with heat class F. The limit temperature of the coils is 155 °C. The
BFK455-25 spring-applied brake is designed for a maximum duty cycle of 60 % with holding current reduc-
tion.
Size
Rated torque
[Nm]
EC-type examination certificate
Directive 2014/33/EC
25
2 x 800
EU-BD 1077
2 x 1200
2 x 1500
