Danfoss VLT Design Guide

Bit 14, Torque OK/limit exceeded:
Bit 14 = ’0’: The motor current is lower than the torque
limit selected in 4-18 Current Limit. Bit 14 = ’1’: The torque
limit in 4-18 Current Limit is exceeded.
Bit 15, Timer OK/limit exceeded:
Bit 15 = ’0’: The timers for motor thermal protection and
thermal protection are not exceeded 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.
7.9.3 Bus Speed Reference Value
Speed reference value is transmitted to the frequency
converter in a relative value in %. The value is transmitted
in the form of a 16-bit word; in integers (0-32767) the
value 16384 (4000 Hex) corresponds to 100%. Negative
figures are formatted by means of 2’s complement. The
Actual Output frequency (MAV) is scaled in the same way
as the bus reference.
Illustration 7.18
The reference and MAV are scaled as follows:
Illustration 7.19
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Danfoss VLT Specifications

General

Frequency	50/60 Hz
Enclosure	IP20, IP21, IP55, IP66
Series	VLT
Control Technique	Flux Vector Control
Output Voltage	0-Vinput
Control Method	Fieldbus
Communication Interface	PROFIBUS, CANopen
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Cooling Method	Liquid Cooled
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% non-condensing
Altitude	Up to 1000m (3280ft) without derating, up to 4000m (13120ft) with derating
Operating Temperature	-10°C to +50°C (14°F to 122°F)