EB-10X Installation & Service Manual |
Motor Data Package
35
Kollmorgen | kdn.kollmorgen.com | October 2020
T
MAX
= -4 min 1n 1-
2
1.5
2.9
t
MAX
= -4 min. 1n [0.7325]
t
MAX
= -4 min. (0.3113)
t
MAX
= 1.25 minutes
If the motor has an ON time greater than 1.25 minutes, it exceeds its thermal limits.
(b) The required OFF time for a given ON time is found from (EQ-2).
T
OFF
= -TCTP 1n 1-
(1-e
-t
/TCTP) T
OUT
ON
2
-t
ON
T
C
2
t
ON
= 4 seconds
TCTP = 4 min 60 sec/min = 240 sec.
t
OUT
= 2.9 lb-ft
T
C
= 1.5 lb-ft
T
OFF
= -240 sec 1n 1-
(1-e
4
/240)2.9
2
-4 sec
(1.5)
2
t
OFF
= -240 sec 1n 0.9383 – 4 sec
t
OFF
= 11.3 sec
For the EB-106-B motor operating at the load point in this example, an ON time of 4
seconds must be followed by an OFF time of 11.3 seconds to not exceed its thermal
limits.
Example #2
The motor of Example #1 is running at 600 rpm with an intermittent operating torque of 3.07
lb-ft.
FIND:
a) maximum ON time.
b) required OFF time for an ON time of 4 seconds.
GIVEN: T
OUT
= 3.07 lb-ft.
From performance curve (EB-106-A PC-26927):
T
C
at 600 rpm = 1.63 lb-ft.
From Specifications CD-27133:
TCTP = 4 min.
Using (EQ-5) and above values:
t
MAX
= 1.31 min.
Using (EQ-2) and an ON time of 4 seconds, an OFF time is:
t
OFF
= 10.4 sec.
