York MILLENIUM 351-46, Руководство по эксплуатации

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FORM 160.00-O1 (1020)
JOHNSON CONTROLS
19
Message:
LOW (CONV, OR PHASE A,B,C) HEATSINK TEMP .
A heatsink temperature sensor indicating a temperature
below 37°F will cause the unit to shut down and display
this message. In most cases the problem will actually
be an open thermistor or broken wiring to the thermis-
tor. The normal thermistor resistance is 10K ohms at
70°F.
Message:
OUTPUT CURRENT IMBALANCE
Normally the three phases of output current will be
closely balanced since the voltage being applied to the
motor is derived from the same DC Link voltage and the
output transistors all switch in an identical pattern. Thus
most imbalances will be due to variations in the motor
windings, which may be as high as 8% typically.
Message:
PRECHARGE BUS V IMBALANCE
This situation is identical to the above shutdown, “Bus
Voltage Imbalance Flt”, except that it has occurred during
the precharge period which begins during pre-lube.
Message:
PRECHARGE LOW VOLTAGE FAULT
During precharge the DC Link must be equal to or greater
than 50 VDC (41 VDC for 50 HZ) ½ second after the pre-
charge relay is energized. The unit is shut down and this
message is generated if this condition is not met.
Message:
PRE-CHARGE HIGH VOLTAGE FAULT
During precharge the DC Link must reach at least 500
VDC (414 VDC for 50 HZ) 15 seconds after the pre-
charge relay is energized. The unit is shut down and this
message is generated if this condition is not met.
Message:
PRE-CHARGE FAULT LOCKOUT
If the unit fails to make pre-charge, the pre-charge relay
shall drop out for a time period of 10 seconds during
which time the units fan(s) and water pump(s) shall
remain energized in order to permit the pre-charge
resistors to cool. Following this 10-second cool down
period pre-charge shall again be initiated. The unit shall
attempt to make pre-charge three consecutive times.
If the unit fails to make pre-charge on three consecu-
tive tries, the unit will shut down, lockout and display
this message. In order to initiate pre-charge again, the
Micropanel’s rocker switch must first be placed into the
STOP/RESET position.
Message:
PWM COMMUNICATIONS FAULT
This shutdown is generated if a communications prob-
lem occurs between the two microprocessors on the
VSD logic board.
Message:
RUN RELAY FAULT
Redundant run signals are generated by the Micropanel,
one via wire #24 and the second via the serial communica-
tions link. Upon receipt of either of the two run commands
by the VSD logic board, a 5-second timer shall commence
timing. If the missing run command is not asserted within
the 5-second window the unit will shut down and the
Micropanel will display the message Run Relay Fault.
This shutdown could occur if there is a problem with the
wiring between the control panel and the VSD.
Message:
SERIAL RECEIVE FAULT
This message is generated when communications be-
tween the ACC and VSD logic is disrupted. Check the
shielded cable between J11 on the VSD logic and J8 on
the ACC board. If all wiring is intact, this problem may
also be caused by electrical noise.
Message:
VSD INITIALIZATION FAILED
At power-up, all the boards go through a process called
initialization. At this time, memory locations are cleared,
jumper positions are checked, and serial communica-
tions links are established. There are many causes for
an unsuccessful initialization. The following check-list
should aid in determining why initialization has not
completed:
• The Micro-Panel and the VSD must be energized
at the same time. The practice of pulling the fuse in
the control panel to make wiring changes will create
a problem. Power-up must be done by closing the
main disconnect on the VSD cabinet with all fuses
in place. Be sure you do not have a blown fuse,
causing loss of power to the VSD logic board.
• The EPROMs must be correct for each board, and
they must be correctly installed. There are a total
of seven (7) EPROMs in each VSD - Micropanel
system. These EPROMs are created as a set, and
cannot be intermixed between earlier and later
styles of units. Also, the ACC EPROM must be in
the ACC board, and the Micropanel EPROM in the
Microboard, etc. All pins must be properly inserted
into the EPROM sockets.
• Serial data communications must be established.
See the write ups for the messages, “Serial Receive
Fault” and “FLTR Serial Receive Fault” (Pages 13
& 16). If communications among the VSD logic, the
filter logic, the ACC and the Microboard does not
take place at initialization, the “VSD Initialization
Failed” message will occur before any other mes-
sage can be generated. You can check to see that
serial communications have been established by