York YZ MODEL A - Page 100

JOHNSON CONTROLS
100
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
TABLE 11 - CYCLING SHUTDOWN MESSAGES (CONT'D)
MESSAGE DESCRIPTION
HARMONIC FILTER – LOW DC
BUS VOLTAGE
The harmonic lter dynamically generates its own lter DC bus voltage by the interac-
tion of the harmonic lter inductor and switching the power devices in the harmonic lter
power unit. This DC level is actually higher than the level obtained by simply rectifying
the input line voltage.
NOTE: The DC link voltage is always higher on the harmonic filter power unit than
on the VSD power unit.
Thus, the harmonic lter actually performs a voltage “boost” function. This is neces-
sary in order to permit current to ow into the AC line from the harmonic lter when the
AC line is at its peak level. This particular shutdown and its accompanying message
are generated when the harmonic lter’s DC link voltage drops to a level less than 80
VDC (for 380 through 460 VAC input voltage) below the harmonic lter DC link voltage
setpoint.
HARMONIC FILTER – PHASE
LOCKED LOOP
This shutdown indicates a circuit called a “phase locked loop” on the harmonic lter
logic board has lost synchronization with the incoming power line for a period of time.
This message may also appear when utility power is removed and reapplied
HARMONIC FILTER –
PRECHARGE LOW DC BUS
VOLTAGE 1 (OR 2)
Two minimum voltage thresholds must be met in order to complete the precharge cycle.
The rst occurs 1/10th of a second after pre-charge is initiated. This measurement will
verify the bus structure, or bus capacitors are not damaged. The second threshold
occurs 5 seconds after precharge is initiated. This measurement will verify the bus
capacitors are charging properly. See table below for specic values of a Nominal Input
Voltage Value of 380-460 VAC.
1ST MINIMUM VOLTAGE VALUE 2ND MINIMUM VOLTAGE VALUE
41 VDC 630 VDC
HARMONIC FILTER – Run
Signal
When a hardware run command is received at the harmonic lter logic board from the
drive logic board, a 5 second timer is started. A redundant run command must also oc-
cur on the communication link from the drive logic board before the timer expires or the
drive will be shut down.