Installation and Operational Instructions for ROBA
®
-diskstop
®
Type 894.5_ _._ _ Sizes 9 and 10
(B.8.4.5.EN)
27/08/2020 TK/TL/GC/SU
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 10 of 17
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Table 3: Switching Times [ms]
Size
9
9
10
10
Design
Min. nominal
braking force
Max. nominal
braking force
Min. nominal
braking force
Max. nominal
braking force
Attraction t
2
500
500
650
650
Drop-out t
0
(DC) from holding voltage
155
40
210
55
Drop-out t
0
(DC) from overexcitation
175
60
260
60
Drop-out t
50
(DC)
2)
from holding voltage
210
70
320
100
Drop-out t
50
(DC)
2)
from overexcitation
230
90
340
110
Drop-out t
90
(DC)
2)
from holding voltage
290
210
720
360
Drop-out t
90
(DC)
2)
from overexcitation
310
230
750
380
Drop-out t
11
(AC)
on request
450
on request
600
Drop-out t
1
(AC)
3)
on request
900
on request
1000
2)
Referring to the nominal braking force
3)
Referring to the effective braking force
The stated switching times can only be achieved using the respective correct electrical wiring. This also refers to the
protection circuit for brake control and the response delay times of all control components.
The use of varistors for spark quenching increases the DC-side switching times.
Diagram 2: Torque-Time Diagram
Key
M
Br
= Braking torque
M
L
= Load torque
t
1
= Connection time
t
11
= Response delay on connection
(
≙
t
0
acc. Type Examination Certificate)
t
2
= Separation time
t
4
= Slip time + t
11
t
O
= Overexcitation time
U
N
= Coil nominal voltage
U
H
= Holding voltage
U
O
= Overexcitation voltage
The switching times are dependent on
the respective spring pressure.
U
O
M
Br
0.1 x M
Br
M
L
t
11
t
1
t
2
t
O
U
M
t
t
t
4
U
H
