Trane TR200 Programming Manual page 166

14-6* Auto Derate
This group contains parameters for derating the adjustable frequency drive in case of high temperature.
14-60 Function at Overtemperature
Option:
[0] * Trip
[1] Derate
No Trip at Inverter Overload
In some pump systems, the adjustable frequency drive has not been sized properly to yield the current needed
in all points of the operational flow-head characteristic. At these points, the pump will need a current higher
than the rated current of the adjustable frequency drive. The adjustable frequency drive can yield 110% of the
rated current continuously for 60 sec. If still overloaded, the adjustable frequency drive will normally trip (causing
the pump to stop by coasting) and provide an alarm.
It may be preferable to run the pump at reduced speed for a while in case it is not possible to run continuously
at demanded capacity.
TR200 Programming Guide
Function:
If either heatsink or control card temperature exceeds a factory-pro-
grammed temperature limit, a warning will be activated. If the tempera-
ture increases further, select whether the adjustable frequency drive
should trip (trip locked) or derate the output current.
The adjustable frequency drive will trip (trip locked) and generate an
alarm. Power must be cycled to reset the alarm, but will not allow restart
of the motor until the heatsink temperature has dropped below the alarm
limit.
If the critical temperature is exceeded, the output current will be reduced
until the allowable temperature has been reached.
Parameter Description
4-129