VMC 186/40 Motion Hardware Information
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External Wiring and Site Installation Information
The VMC 186/40 can be placed in any VME chassis slot. External power supplies must be provided for both
the transducer inputs and drive outputs. The power supplies should 5 volts and ± 15 volts with at least
500 mA. If possible, do not connect the power supplies to any other loads.
When wiring the system, it is important that the drive extends when a positive voltage or current is sent to the
drive. The extend direction is defined as the direction that would cause the transducer or other type of sensor to
return increasing transducer counts. The extend directions on a magnetostrictive transducer is away from the
transmitting end.
Note: Electrical noise problems on older style magnetostrictive transducer may be reduced by connecting a 220
ohm resistor between the interrogation pulse and common. Locate the resistor as close to the transducer as
possible.
CAUTION: Do not connect the drive outputs to the drives until the limits have been computed and VMC
186/40 properly initialized with these limits using the VME controller.
Delta Computer Systems, Inc. supplies two cables with each module. One for the transducers and one for the
drives. The cable with the male DB 25 is used to connect the transducers to the DB25 front panel connector.
Its wire color is:
Pin Function
Color
1
+15 input
RED
2
Power supply common
BLACK
3 -15
input
WHITE
4
+5 input
GREEN
5
+12 output
ORANGE
6
Common
GRAY
7
Interrogation pulse 1
BROWN
8
+15v axis 1
PINK
9
Return pulse 1
YELLOW
10
-15v axis 1
VIOLET
11
Common
TAN
12
Interrogation pulse 2
BLUE
13
+15v axis 2
RED/BLACK
14
Return pulse 2
RED/YELLOW
15
-15v axis 2
RED/GREEN
16
Common
WHITE/BLACK
17
Interrogation pulse 3
WHITE/BLUE
18
+15v axis 3
WHITE/RED
19
Return pulse 3
WHITE/YELLOW
20
-15v axis 3
WHITE/GREEN
21
Common
WHITE/GRAY
22
Interrogation pulse 4
WHITE/BROWN
23
+15v axis 4
WHITE/ORANGE
24
Return pulse 4
WHITE/BLACK/RED
25
-15v axis 4
WHITE/VIOLET
If possible, always connect the transducer's
±
15 volts directly to the VMC 186/40. The module provides
current limiting resistors to protect the transducer.
