Installation and Operational Instructions for
ROBA
®
-brake-checker plus DC Type 028.600.2
(B.0286002.EN)
your reliable partner
02/10/2018 TF/GF
Page 8 of 10
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Tel.: +49 8341 804-0, Fax: +49 8341 804-421
www.mayr.com
, E-Mail:
88
0
Time Diagram:
If the switching frequency is higher than 1
cycle per minute or if the overexcitation time
t
O
is longer than double the separation time t
2
,
please observe the following:
P ≤ P
N
The coil capacity P must not be larger than P
N
or the nominal current I which flows through
the ROBA
®
-brake-checker monitoring module
must not be exceeded, otherwise the coil and
the ROBA
®
-brake-checker monitoring module
may fail due to thermal overload.
U
U
O
U
N
U
H
T
t
on
t
off
t
O
t
N
t
Calculations:
P
[W]
RMS coil capacity dependent on switching
frequency, overexcitation and duty cycle
P
=
P
O
x t
O
+ P
N
x t
N
T
P
N
[W]
Coil nominal capacity (catalogue values, Type tag)
P
O
[W]
Coil capacity on overexcitation
P
O
=
(
U
O
)²
x P
N
U
N
P
H
[W]
Coil capacity at power reduction
P
H
=
(
U
H
)²
x P
N
U
N
t
O
[s]
Overexcitation time
t
H
[s]
Time of operation with reduction in capacity
t
N
[s]
Time of operation with coil nominal voltage
t
off
[s]
Time without voltage
t
on
[s]
Time with voltage
T
[s]
Total time (t
O
+ t
N
+ t
off
)
U
O
[V]
Overexcitation voltage
U
H
[V]
Holding voltage
U
N
[V]
Coil nominal voltage
I
[V]
RMS current dependent on switching frequency,
overexcitation time and duty cycle
I
=
P x P
N
U
N
²
t
88
