YASKAWA
TOEP YAICOM 22A BACnet MS/TP Installation & Technical Manual
53
Table 8.1 Types of Enter Commands
BACnet Object
Modbus Address
(Hex.)
Description
BV55 (Write
“
ON
”
)
0910 (Write 0)
This updates the data on the RAM, but does not write data to the
EEPROM.
This process saves the parameter changes until you de-energize the
drive.
BV56 (Write
“
ON
”
)
0900 (Write 0)
When you write parameter data to the EEPROM, you will enable
the data on the RAM at the same time.
This process saves the parameter changes through a power-cycle of
the drive
Note:
You can write the EEPROM to the drive a maximum of 100,000 times. Do not frequently execute the Enter
command (0900 (Hex.)) that is written to EEPROM. The Enter command registers 0900 (Hex.) and 0910 (Hex.)
are write-only. If these registers are read, the register address will not be applicable, but BACnet objects BV55
and BV56 can be read without error.
9
Troubleshooting
◆
Drive-Side Error Codes
Drive-side error codes appear on the drive keypad.
lists causes of the
errors and possible corrective actions. Refer to the drive Technical Manual for additional
error codes that can appear on the drive keypad.
■
Faults
Both
bUS [Option Communication Error]
and
EF0 [Option Card External Fault]
can
appear as a fault. When a fault occurs, the digital characters shown on the keypad does not
flash but stay lit. The keypad ALM LED also stays lit. When an alarm occurs, the ALM
LED flashes.
Note:
Normally,
o2-24 = 2 [LED Light Function Selection = Keypad LED Light Disable]
is set as a factory default,
so the ALM LED does not light.
If communication stops while the drive is running, use these questions as a guide to help
remove the fault:
•
Is the option properly installed?
•
Is the communication line properly connected to the option? Is it loose?
•
Did a momentary power loss interrupt communications?
