SIEMENS
2/45
Siemens D 83.1 · 2016
2
Motors with Explosion Protection
LOHER CHEMSTAR and VARIO 1PS4 and 1PS5 motor series
General information
■
Technical specifications
(continued)
Built-on single-disk spring-operated brake
Design
The explosion-proof single-disk spring-operated brake is attached
to the reinforced fan cover and the extended motor shaft.
Otherwise, in terms of their mechanical design, the motors are
identical to the surface-cooled motors in this catalog.
Voltage and frequency:
Motors with a built-on brake are
supplied for the voltages and frequencies specified in the power
tables.
Power:
The power ratings specified in the selection tables are
applicable to S4 duty type in accordance with EN 60034-1.
Thermal motor protection:
The motors have 3 embedded
PTC thermistors and are designed for sole protection in
combination with a trip unit.
Possible brake size:
See power table
Connection:
The brake is connected in the terminal box
mounted on the brake.
Brake:
Type 76...-..B
Degree of protection acc. to EN 60034-5:
IP67
Permissible ambient temperature:
-20 to +40/50 °C
Type of protection
acc. to EN 60079-0, EN 60079-1 and
EN 60079-7: II 2G Ex de IIC T5/T4 Gb
Terminal box: II 2G Ex e II Gb
In special design with dust protection II 2D Ex tb IIIC T95/
115 °C Db, approval DMT02 ATEX E 122 X
AC connection:
Preferred voltage 230 V 1 AC, frequency 40 to 60 Hz or
DC connection:
Preferred voltages 24 V DC, 205 V DC
The single-disk spring-operated brake is an electromagnetic
unit for dry-running operation. An electromagnetic field is used
to release the brake which is applied using spring force.
The spring-operated brake brakes at zero current and releases
when an AC or DC voltage is applied. The brake can be
operated on the AC or DC side when alternating current is
flowing.
The brake is equipped with a microswitch and 2 thermostatic
switches. These switching elements are dimensioned for
250 V AC, 2.5 A inductive. In the control line of the motor contac-
tor, the microswitch prevents the motor starting in opposition to
the unreleased brake. The microswitch is not permitted to be
used in lifting gear and elevators. The thermostatic switches
(NC) connected in series with the microswitch (NO) interrupt the
control circuit as soon as an impermissible temperature rise
occurs in the brake. The motor is only permitted to be controlled
via the microswitch of the spring-operated brake to ensure that
it can never start in opposition to the unreleased brake. The
brake can be equipped with a manual release on request, which
allows the brake to be released manually.
If the motor is only ordered and used for S1 duty type and the
built-on brake is only required as a holding brake, the motor can
be protected with a motor circuit breaker in accordance with
DIN VDE 0165.
Mechanical design with brake
Dust and explosion protection II for DC or single-phase AC
General technical specifications
Technical specifications
G_D083_XX_00074
Brake designs
76 ..E..B00 – DC
(direct current)
76 ..G..B00 – AC
(alternating current)
Standard
rated voltage
V
205 V DC
230 V AC
Degree of
protection
–
IP67
Temperature
class
–
T4/T5 (according to EN60079-0)
Rated torque
Nm
10 … 270
Brake size
10
11
13
16
19
24
Braking torque
T
2
Nm
10
20
50
100
150
270
Max. speed
n
max
rpm
6000
6000
3600
3600
3600
3600
Maximum
switching power
P
max.
kJ/h
270
270
400
400
570
570
Maximum
operating energy
(
Z
= 1)
W
max
kJ
41
41
55
55
80
80
Rated power
P
rated
W
56
56
82
82
91
91
Apparent power
P
S
VA
62
62
88
88
95
95
Application time
t
1
ms
80
70
110
90
180
140
Release time
t
2
ms
80
110
170
230
240
350
Moment of inertia
of brake
(driver and
friction disk)
kg
m
2
0.0025 0.0025 0.0215 0.0215 0.125 0.125
Weight
m
kg
14.5
14.5
29
29
57
57
© Siemens AG 2016