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59
OPTIONS
7. Optional Features
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.
14-pin
Connector
Speed
Encoder
pin 11
index pulse
pin 10
TACH_A
pin 2
TACH_B
pin 7
+5 VDC
pin 8
+5 VDC COM
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).
1
2
3
4
5
6
7
8
9
10
11
12
13
14
BACK
PANEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J1
TORQUE AMPLIFICATION BOARD
INDEX
+5 VDC
TACH_A
TACH_B
2
1
3
5
4
6 SW1
1
2
3
1
2
3
4
5
600/6000-BIT
ENCODER
60 BIT
ENCODER
INDEX
J4
J7
+5 VDC COM
Figure 7–1 Speed Encoder Schematic
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.