York VSD 292 Series - VSD - Precharge Lockout; Harmonic Filter - High Baseplate Temperature; Harmonic Filter - High Total Demand Distortion

JOHNSON CONTROLS
33
SECTION 3 - SAFETY SHUTDOWNS
FORM 160.00-O4
ISSUE DATE: 07/31/2019
3
TABLE 3 - SAFETY SHUTDOWNS (CONT'D)
MESSAGE DESCRIPTION
VSD - Precharge Lockout
PRE-CHARGE FAULT LOCKOUT
If the OSCD fails to meet the pre-charge criteria (refer to pre-charge faults), the
pre-charge circuit will wait for a period of 10 seconds before another pre-charge
attempt. The unit’s cooling fans and coolant pump shall remain energized during
this time period. Following this 10-second period, the pre-charge shall again be
initiated. The unit shall attempt to meet the pre-charge criteria three consecutive
times before the OCSD will shutdown, lockout, and display this message.
Harmonic Filter - High
Baseplate Temperature
HIGH FILTER BASEPLATE
TEMPERATURE FAULT
A thermistor sensor is located inside the transistor module on the harmonic lter
power unit. If at anytime this thermistor detects a temperature higher then the
threshold value a shutdown will occur. Refer to the chart below for the shutdown
threshold values. A manual reset is required by pressing the “Overtemp Reset”
pushbutton located on the Filter Logic board.
DRIVE HP RATING THRESHOLD SHUTDOWN VALUE
270, 292, 351 175°F (79°C)
385, 419, 424, 503,
608 (575 VAC)
190°F (88°C)
608 (400 VAC), 704, 658, 790 194°F (90°C)
868, 882, 914, 917, 948, 1055 175°F (79°C)
Harmonic Filter - High Total
Demand Distortion
FLTR HIGH TDD FLT
The control center determines this shutdown by using data supplied from the
harmonic lter logic board. This shutdown indicates that the lter is not operating
correctly or the input current to the OSCD/lter system is not sinusoidal. This shut-
down will occur if the Total Demand Distortion (TDD) in any one phase exceeds
25% continuously for 45 seconds. TDD is an acronym for Total Demand Distortion,
a term dened by the IEEE Std 519-1992 standard as “the total root - sum - square
harmonic current distortion, in percent of the maximum demand load current (15
or 30 min demand)”. The harmonic lter option was designed to provide an input
current TDD level of 8% or less for the OSCD system. A standard OSCD less the
optional lter typically has an input current TDD level on the order of 28 - 30%.