Specifications
24 ζ
ZETA6104 Installation Guide
Mounting & Coupling the Motor
WARNINGS
• Improper motor mounting and coupling can jeopardize personal safety, and compromise system performance.
• Never disassemble the motor; doing so will cause contamination, significant reduction in magnetization, and loss of torque.
• Improper shaft machining will destroy the motor’s bearings, and void the warranty. Consult a factory Applications Engineer
(see phone number on inside of front cover) before you machine the motor shaft.
Mounting the Motor
Use flange bolts to mount rotary step motors. The pilot, or centering flange on the motor’s front face, can
help you position the motor.
Do not use a foot-mount or cradle configuration, because the motor’s torque is not evenly distributed around
the motor case. When a foot mount is used, for example, any radial load on the motor shaft is multiplied by a
much longer lever arm.
ZETA motors can produce very high torque and acceleration. If the mounting is inadequate, this combination
of high torque/high acceleration can shear shafts and mounting hardware. Because of shock and vibration that
high accelerations can produce, you may need heavier hardware than for static loads of the same magnitude.
Under certain move profiles, the motor can produce low-frequency vibrations in the mounting structure that
can cause fatigue in structural members. A mechanical engineer should check the machine design to ensure
that the mounting structure is adequate.
Zeta Motor Dimensions
1.856
(47.14)
2.27
(57.66)
max
1.502
1.498
(38.15)
(38.05)
120
0.215
0.195
(5.461)
(4.953)
dia (4)
on 2.625 (66.67) BC
(305) 8 wire
shielded
0.19 (4.83)
0.83
0.73
(21.08)
(18.54)
A
0.063(1.60)
0.82
0.72
(20.83)
(18.29)
0.2500
0.2495
(6.35)
(6.34)
Shaft Dia (2)
1.118
(28.40) dia
60
#6-32 UNC-2B Thd
x 0.25 DP
(3) Equally Spaced
on 1.865 BC
(6.50)
(47.37)
Size 23 Frame
Model
ZETA57-51
ZETA57-83
ZETA57-102
A
2.0 (50.23)
3.1 (75.23)
4.0 (101.6)
2.877
2.873
(73.07)
(72.97)
dia
3.25
(82.55)
max
2.730
2.750
(69.34)
(69.85)
3.40
(86.36)
Max Casting Size
120 (305)
8 wire
shielded
0.228
0.218
(5.79)
(5.54)
dia (4)
on 3.875 (98.42) BC
0.3750
0.3745
(9.52)
(9.51)
Shaft Dia (2)
0.19
(4.83)
A
0.063
(1.60)
1.21
1.17
(30.70)
(29.72)
1.23
1.15
(31.24)
(29.21)
30
0.750
x 0.050 Deep
Bore Min
(19.05) dia
(1.27)
#6-32 UNC-2B Thd
x 0.25 DP
(4) Equally Spaced
on 2.952 BC
(6.50)
(74.98)
Size 34 Frame
Model
Z
ETA83-62
Z
ETA83-93
Z
ETA83-135
A
2.5 (62.0)
3.7 (93.98)
5.2 (129.0)
inches (millimeters)
Motor Temperature & Cooling
The motor’s face flange is used not only for mounting; it is also a heatsink. Mount the face flange to a large
thermal mass, such as a thick steel plate. This is the best way to cool the motor. Heat will be conducted from
inside the motor, through the face flange, and dissipated in the thermal mass. You can also use a fan to blow air
across the motor for increased cooling, if you do not get enough cooling by conduction through the face flange.
In addition, the ZETA6104 has an automatic standby current feature that reduces motor current by 50% if no
step pulses have been commanded for a period of 1 second or more. (WARNING: torque is also reduced.)
Full current is restored upon the first step pulse. To enable this feature use, the DAUTOS1 command (default
is disabled, DAUTOSØ). The DAUTOS command setting is NOT automatically saved in non-volatile memory;
therefore, if you intend to use this mode on power up, you have to place the DAUTOS1 command in a set-up
(STARTP) program—see example on page 31, or refer to the 6000 Series Programmer's Guide for instructions.