Yaskawa DSD 406 - Manual (Page 28)

3 Operation
24 Controls and Indicators
3/21/96
Standard
Control/Display
Unit (SCDU)
Non-Volatile
“RAM” Protection
Current exceeded safe levels for too long and drive was stopped to protect the
motor.
Drive contactor safety interlock is detected as open. Drive will not run when this
light is on.
Indicates that a declared drive fault exists. The Fault/Error Code List defines
what conditions the drive will recognize as faults.
IMPORTANT
Clearing a Fault from the Fault List is NOT THE SAME as
resetting the fault. Some faults are transient in nature and require
no further action after clearing the fault from the Fault List.
Others require some additional positive action to allow the drive
to continue to run. See the Fault/Error Code List for further
details.
The major part of the SCDU is a 4-1/2 digit numeric LED display. Each of its
four full digits can display the values of 0 to 9 plus limited alphabetic characters.
The so-called half digit can display only the value “1” and a plus or minus sign.
Below the numeric LED, is a single indicator and four push buttons. The four
push buttons (DATA/FCTN,
⇑
[UP],
⇓
[DOWN], and ENTER) are used to
operate the SCDU.
Next to the numeric displays of the SCDU is a red LED labeled MEM
UNPROT. This LED is lit when the “protected” portion of the non-volatile
random access memory (NVRAM) can be written to. Protection of the NVRAM
is determined by the switch labeled NVRAM PROTECTION. When this
switch is in the "ON" position, the MEM UNPROT LED is off and the
protected portion of the NVRAM can not be written to. This prevents setup
parameters and other important constants from being accidentally erased or
changed. When these parameters need to be changed the switch can be moved
to the "OFF" position, removing the write protection and causing the MEM
UNPROT LED to be lit.
Fault
CAUTION
The NVRAM PROTECTION switch should be left in the
"ON" position to protect the NVRAM during the critical
power-up and power-down periods.
Overload
E-Stop
The optional Portable Control/Display Unit (PCDU) plugs into a telephone-style
jack at the bottom left of the DSD Drive Control PCB (accessible through a
cutout at the bottom left of the front cover). If your unit is equipped with this
option, refer to the PCDU guide provided with the unit for operating procedures. Portable
Control/Display
Unit Connection