© 2005, The STANLEY WORKS. ALL RIGHTS RESERVED.
203936 Rev. C
MA900 Installation Manual
19
Doors of other weights and widths can be calculated using
the formula:
T=D
√
W / 133 in US units
T=D
√
W / 2260 in SI (metric) units
Where: T = Time,
sec
D = Door width, in. (mm)
W = Door weight, lb. (kg)
The ANSI Standard specifies that doors be adjusted so that:
• Opening time from 0° to 80° or back check, whichever occurs
first, is 3 sec. or longer as stated in Table 1.
• The time from back check to full open (90°):
If back check @ 60°, 2 sec.
If back check @ 70°, 1.5 sec.
If back check @ 80°, 1 sec.
See Controller Adjustments to adjust opening time & back
check time.
Matrix values for “T” time have been rounded up to the nearest
half sec. These values are based on kinetic energy of 1.25 lb.ft.
The ANSI standard specifies
that doors be adjusted so that:
•
Closing time from 90˚ to 10 ˚ (latch check) is 3 sec or
longer, as stated in Table 1.
•
The time from 10˚ to fully closed is not less than 1.5 sec.
Fig. 27
Closeup of rheostat
Closing time is controlled by the rheostat. Use your fingers to
rotate the rheostat knob ccw to increase, cw to decrease, the
closing time (see Fig. 27).
Adjust Opening and Closing Times
Adjusting elements are close to live
electrical parts.
Table 1.
Minimum opening time to back check or 80˚, which ever occurs first, or minimum closing time from 90˚ to
latch check or 10˚. Back check shall not occur before 60˚ opening.
“D” Door Leaf
“W” Door Weight in lb (kg)
Width - in.
(mm)
100 (45.4)
125 (56.7)
150(68.0)
175(79.4)
200(90.7)
30 (762)
3.0*
3.0
3.0
3.0
3.5
36 (914)
3.0
3.5
3.5
4.0
4.0
42 (1067)
3.5
4.0
4.0
4.5
4.5
44 (1118)
4.0
4.5
4.5
5.0
5.5
* The value for the 30 in. wide, 100 lb door actually calculates to 2.5 sec with rounding. 3.0 sec was used as a
more conservative value.
Summary of Contents for MA900n
Page 3: ...MA900 Installation and Owner s Manual 203936 Rev C ...
Page 4: ... 2005 The STANLEY WORKS ALL RIGHTS RESERVED 203936 Rev C MA900 Installation Manual 2 ...
Page 29: ... 2005 The STANLEY WORKS ALL RIGHTS RESERVED 203936 Rev C MA900 Installation Manual 27 Notes ...
Page 30: ... 2005 The STANLEY WORKS ALL RIGHTS RESERVED 203936 Rev C MA900 Installation Manual ...
