English
3. INSTALLATION – MIDIMASTER Vector
G85139-H1751-U529-D1
© Siemens plc 1999
4/8/99
30
3.2.2 Control Connections
Control connections to the MIDIMASTER Vector are made via two terminal blocks located as shown in Figure 3.2.1. The terminal
blocks are of a two-part design. The part containing the screw terminals can be unplugged from it’s housing before wires are
connected. When all connections to the terminals have been made (
as shown in Figures 3.2.1 and 3.2.2
) and secured, the terminal
block must be plugged firmly back into it’s housing.
1
2
3
4
8
5
6
7
9
10
11
Power Supply
for PID Feedback
Transducer
(+15 V, max. 50 mA)
Power Supply
(+10 V, max. 10 mA)
Analogue Input 1
-10 V to +10 V
0/2
Þ
10 V
(input impedance 70 k
W
)
or
0/4
Þ
20 mA )
(Resistance = 300
W
)
Output Relays (RL1 and RL2)
max. 0.8 A / 230 V AC
(overvoltage cat.2)
2.0 A / 30 V DC
(resistive rating)
Digital Inputs
(7.5 - 33 V, max. 5 mA)
P10+
0V
AIN+
AIN-
P15+
DIN1 DIN2 DIN3
PIDIN-
Control Terminals
DIN4
PIDIN+
Analogue input 2
0
Þ
10 V
or
0
Þ
20 mA
Analogue Output 2
0/4 - 20 mA
(500
W
load)
use with terminal 13
Analogue Output 1
0/4 - 20 mA
(500
W
load)
12
13
14
15
19
16
17
18
20
A1OUT+ AOUT- PTC PTC DIN5 DIN6
Digital Inputs
(7.5 - 33 V, max. 5 mA)
Motor temp.protection input
RL1A
(NC)
RL1B
(NO)
RL1C
(COM)
21
22
RL2B
(NO)
RL2C
(COM)
N-
A2OUT+
PE
P5V+
P+
23
24
25
26
27
RS485
(for USS protocol)
Note:
For PTC motor thermal
protection, P087 = 1
Front Panel
RS485 D-type
N-
0V
5V(max.250mA)
P+
PE (case)
6
1
5
9
Figure 3.2.2: Control Connections - MIDIMASTER Vector
Note:
Do not use the internal RS485 connections (terminals 24 and 25) if you intend using the external RS485 connection on the
front panel e.g. to connect an Clear Text Display (OPM2).
DIP switches select between voltage (V) and current (
I
) analogue inputs. They also select between either a voltage or current PID
feedback signal (
see Figure 4.1.2: DIP Selector Switches
). These switches can only be accessed when:
·
for Frame size 4, 5 and 6 the front cover is removed
(see Figure 3.2.1).
·
for Frame size 7 the lower front cover is removed (
see Figure 3.2.1
).
3.2.3 Motor Overload Protection
When operated below rated speed, the cooling effect of fans fitted to the motor shaft is reduced. so that most motors require de-rating
for continuous operation at low frequencies. For protection measures using a PTC see section 2.2.5.
