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7.1
SPEED ENCODER
All Magtrol dynamometers come standard with a 60-bit speed encoder, best suited for high-speed
systems. For low speed motors, with maximum speeds of less than 200 rpm, Magtrol offers several
additional encoder options, which include:
•
600-bit single encoder
•
6000-bit single encoder
•
60/600-bit dual encoder
•
60/6000-bit dual encoder
With the single higher resolution encoder option, five wires from the 600 or 6000-bit encoder run
internally to the torque amplification board. All five of the wires from the encoder are then passed
directly to the back panel connector.
With the dual encoder option, the dynamometer comes equipped with a standard 60-bit encoder and
an additional 600 or 6000-bit encoder. The user can select which encoder to use via a back panel
switch. (See Figure 2–1 Rear Panel). Five wires from the 600/6000-bit encoder run the torque
amplification board. Three of the wires from the encoder are then passed directly to the back panel
connector (14-pin connector, pin 11 = index pulse, pin 2 = TACH_B, pin 8 = +5VDC COM.). Two
of the wires route to a double pole double throw switch. The switch selects which encoder will be
powered up and routes the appropriate Tach_A signal to the 14-pin connector (14-pin connector,
pin 10 = TACH_A, pin 7 = +5VDC).
600/6000-BIT
ENCODER
60 BIT
ENCODER
The 60 bit encoder may be used for high speed systems and the 600/6000-bit encoder for lower
speed applications. Additionally the TACH_A and TACH_B signals can be quadrature decoded to
give even higher resolutions and direction of rotation.
7. Optional Features
14-pin
Connector
pin 11
pin 10
pin 2
pin 7
pin 8
J4
INDEX
1
2
3
4
5
J7
1
2
3
TORQUE AMPLIFICATION BOARD
Figure 7–1 Speed Encoder Schematic
Speed
Encoder
index pulse
TACH_A
TACH_B
+5 VDC
+5 VDC COM
TACH_B
6 SW1
5
4
TACH_A
3
2
+5 VDC
1
INDEX
+5 VDC COM
59
BACK
J1
PANEL
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
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