ROWAN ELETTRONICA s.r.l. - Via Ugo foscolo, 20 - 36030 CALDOGNO (Vicenza)
page 9 out of 24
CONNECTING THE TERMINAL BOARD TO THE MOTOR SERVICES
1 - 2 Tachometrical dynamo: it is possible to extract the tachometrical dynamo
voltage that is keyed to the motor shaft from these terminals. The dynamo
supplies a continuous voltage equal to 20VDC at 2800r/m directly proportional
with the motor speed. Because of this (and also because it is connected to the
drive for motor speed control) it can be used for analogue counters with display
or other servomechanisms, as long as the total load is not above 3Kohm
(maximum dynamo current 10mA). In order to avoid disturbances it is always
opportune to connect the tachometrical dynamo with screened cable, above
all when the paths are long and close to power cables.
3 - 4 Fan: these terminals have to be supplied with a 230VAC voltage for separate motor ventilation. They should be
supplied in a manner that ensures ventilation even when the motor is stopped in order to exploit the moments of pause
for cooling. Some highly powered Rowan motors equipped with threephase cochlear fan are supplied directly by the fan
motor terminal board. Consult the table on page 8 to see the powers used by the fans.
5 - 6 Temperature probe: this is a Normally Closed contact that opens when the temperature of the motor windings
exceeds 150°C, a safety limit corresponding to class H (180°C). This probe is used as an emergency to deactivate the
electromagnetic running switch. Keep in mind that the maximum capacity of the contact is 1A-230VAC.
Caution! Terminals 5-6 are not present on the ROWAN MEC 63 motor service terminal board (the 63 motor is not
equipped with thermal probe).
CONNECTING THE BRAKE
Rowan motors may be supplied, on request, with an electromagnetic brake. This would mean a purposely built motor
with a lengthened axle and brake fitted to the front part, supported by a bell shaped cover that reproduces normal flanging.
The brake is a Spring type: it is necessary to remove the brake power supply to stop the motor axle. It is used as a safety
brake if the power supply should be lost, in the case of over head loads such as bridge cranes, cranes etc. (verify whether
it would be necessary to adapt the air gap at 0,3mm ± 0,005).
This brake operates at 24VDC and is powered by a single connector or a connector found on the bell shaped front brake
holder. It is always convenient to connect a diode or R/C in parallel to the brake, above all when close to equipments which
are particularly subject to interferences.
It is necessary to bear in mind that the flywheel diode has a maximum filtering efficiency, but it delays spring
brake insertion.
Note: for a better use of the brake, Rowan Elettronica suggests the following connection to the C321S device:
This device gives a 33÷37Vdc starting voltage and a succeeding 21÷23Vdc maintainance voltage. In this way the brake release is sped
and the overtemperature, during the continuous service, is avoided.
TABLE GIVING THE POWER USED BY THE 24VDC BRAKE
S
E
D
O
C
N
O
I
T
A
C
I
F
I
T
N
E
D
I
d
n
a
S
C
I
T
S
I
R
E
T
C
A
R
A
H
C
N
O
I
T
B
R
O
S
B
A
/
E
U
Q
R
O
T
S
E
K
A
R
B
R
O
T
O
M
E
K
A
R
B
G
N
I
R
P
S
E
U
Q
R
O
T
N
O
I
T
B
R
O
S
B
A
.
D
O
C
N
A
W
O
R
G
N
I
K
C
O
L
B
N
U
R
E
V
E
L
E
K
A
R
B
G
N
I
T
R
A
T
S
E
M
I
T
E
K
A
R
B
G
N
I
P
P
O
T
S
E
M
I
T
m
N
W
.
d
o
C
.
d
o
C
s
m
s
m
1
7
/
3
6
4
0
2
1
0
K
1
7
3
6
M
R
F
/
7
1
5
3
0
8
8
5
2
2
0
K
0
8
M
R
F
/
5
3
5
6
0
0
1
/
0
9
0
2
0
3
4
0
K
1
1
0
1
9
M
R
F
4
0
K
1
1
0
1
9
A
V
E
L
0
4
0
9
L
2
1
1
/
2
1
1
0
3
0
4
5
0
K
2
1
1
M
R
F
5
0
K
2
1
1
A
V
E
L
0
5
0
2
1
L
2
3
1
-
2
3
1
L
0
6
1
-
0
6
1
0
8
5
5
7
0
K
.
6
1
3
1
.
M
R
F
7
0
K
6
1
3
1
A
V
E
L
BRAKE
BRAKE
command
FAN
DYNAMO
TEMP. PROBE
