NORD Drivesystems B1904 User Manual
Page 15
Operating and Installation Instructions FDB (Getriebebau NORD)
Version 08.2011
Page
15
of 23
3.2.2.7 Switching times
Size
Nominal
braking
torque
[Nm]
Separating
time
[ms]
Response
delay
[ms]
Linkage time
[ms]
Response
delay
[ms]
Linkage time
[ms]
switched on d.c. side
switched on a.c. side
M
bN
= t
2
=
t
11DC
=
t
1DC
=
t
11AC
=
t
1AC
=
08
7,5*
60*
12*
32*
40*
70*
5
35 18 38 60 90
10
15*
85*
15*
45*
80*
125*
10
60 20 50 100 145
13
30*
125*
20*
60*
140*
200*
20
85 25 65 220 280
15
60*
140*
18*
68*
80*
155*
40
100 20 70 150 225
17
90*
190*
18*
78*
120*
210*
60
120 22 82 200 290
20
150*
175*
26*
106*
160*
280*
100
150 35 115 300 420
23
225*
290*
40*
140*
250*
400*
150
270 45 145 320 570
26
375*
360*
46*
166*
200*
400*
250
300 58 178 400 600
30
600*
450*
50*
180*
250*
600*
400
400 65 195 550 900
40**
1500*
450*
120*
280*
2500*
2950*
1000
320 160 320 3000 3450
* Holding brakes with emergency-stop properties
** Switched with fast acting rectifier (over-excitation)
— The switching times indicated are to be understood as tolerance-afflicted
guide values with nominal air gap —
t
2
= separating time = time from switching on the current to cessation of braking torque (M
b
≤ 0,1*M
bN
)
– Over-excitation by fast acting rectifier results in approx. half the separating times –
t
1
DC = linkage time = response time when braking with interruption at d.c. side by mechanical switches =
time from switching off current to reaching the full braking torque (M
b
≥ 0,9*M
bN
)
t
1
AC = linkage time = response time when braking with shutdown at a.c. side, i.e. by interrupting a
separately
supplied rectifier
t
11
DC / t
11
AC = response delay = time from switching off current to the rising of the braking torque
(included in the respective linkage time)
– Depending on operating temperature and wear of the brake disks, the real response times (t
2
, t
1
DC, t
1
AC)
may deviate from the guide values indicated here. In case of a voltage reduction by a fast acting rectifier, there
will be reduced linkage times –