EB-20X Installation & Service Manual | Motor Data Package
38
Kollmorgen | kdn.kollmorgen.com | September 2020
T
OFF
= -1320 sec 1n 1- (1-e
4
/1320) 6.6
2
-4 sec
(4.0)
2
t
OFF
= -1320 seconds 1n 0.99176 – 4 seconds
t
OFF
= 7.0 seconds
For the EB-206-C motor operating at the load point in this example, an ON time of 4 seconds
must be followed by an OFF time of 7.0 seconds so the motor does not exceed its thermal limits.
Example #2
The motor of Example #1 is running at 2500 rpm with an intermittent operating torque of 8.6 lb-ft.
FIND:
(a) max. ON time.
(b) required OFF time for an ON time of 4 seconds.
GIVEN: TOUT = 8.6 lb-ft
From the performance curve EB-206-A PC-26726,
TC = 4.1 lb-ft at 2500 rpm.
From Specifications CD-26718, TCTP = 22 min.
(a) Using EQ5 and the values above:
t
MAX
= 5.6 min.
(b) Using EQ2 and an On time of 4 seconds, an OFF time is:
t
OFF
= 13.7 seconds
Example #3
The motor in Example 1 is running at 1000 rpm with an intermittent operating torque of 8.9 lb-ft.
FIND:
(a) max. ON time.
(b) required OFF time for an ON time of 4 seconds.
GIVEN: t
OUT
= 8.9 lb-ft
From the performance curve EB-206-A PC-26726,
T
C
= 4.4 lb-ft at 1000 rpm.
From Specifications CD-26718, TCTP = 22 min.
(a) Using EQ5 and the values above:
t
MAX
= 6.2 min.
t
ON
= 4 sec
(b) Using EQ2 and the values above:
t
OFF
= 12.4 sec
The applications engineers at Kollmorgen will assist in the proper sizing of
the motor and amplifier based on the application's duty cycle. Contact them
if any questions arise in the derivation of t
MAX
or t
OFF
with a specific duty
cycle.
