Specifications

Bit 11, No operation/in operation:

Bit 11= ’0’: The motor is not running. Bit 11=’1’: The

frequency converter has a start signal or the output

frequency is greater than 0 Hz.

Bit 12, Drive OK/stopped, autostart:

Bit 12=’0’: There is no temporary over temperature on the

inverter. Bit 12=’1’: The inverter stops because of overtem-

perature but the unit does not trip and resumes operation

once the overtemperature stops.

Bit 13, Voltage OK/limit exceeded:

Bit 13 = ’0’: There are no voltage warnings. Bit 13 = ’1’: The

DC voltage in the intermediate circuit is too low or too

high.

Bit 14, Torque OK/limit exceeded:

Bit 14 = ’0’: The motor current is lower than the torque

limit selected in F-43 Current Limit. Bit 14 = ’1’: The torque

limit in F-43 Current Limit is exceeded.

Bit 15, Timer OK/limit exceeded:

Bit 15 = ’0’: The timers for motor thermal protection and

thermal protection do not exceed 100%. Bit 15 = ’1’: One

of the timers exceeds 100%.

All bits in the STW are set to ’0’ if the connection between

the Interbus option and the frequency converter is lost, or

an internal communication problem has occurred.

Installation and Set-up VLT® HVAC Drive FC 102 Design Guide

MG16C102 - Rev. 2013-08-20 181