VDL200 • Quick installation guide - Specifications and connection 55
Note ! For the correct interpretation of the cause of the alarm trigger, it is necessary to transform the hex code indicated in parameter 15.13 SpdFbkLoss code,
PAR 2172 , in the corresponding binary and verify in the encoder table that the active bits and related description are used.
Example with digital incremental encoder:
PAR 2172 = 3 (hex value)
In the table “Speed fbk loss [22] alarm with digital incremental encoder” 0x03 is not indicated in the value column.
0x03 should be contemplated as a bitword with meaning 00011 -> bit 0 and bit 1 . The following causes simultaneously intervene:
Bit 0 = 0x01 Cause: no impulses or disturbance on incremental channel A.
Bit 1 = 0x02 Cause: no impulses or disturbance on incremental channel B.
The value is displayed in hexadecimal format on the optional and standard keypad.
Speed fbk loss [22] alarm with digital incremental encoder
Bit Value Name Description
0 0x01 CHA Cause: no impulses or disturbance on incremental channel A.
Solution: Check the connection of the encoder-drive channel A, check the connection of the screen, check the encoder supply voltage, check parameter
2102 Encoder supply.
1 0x02 CHB Cause: no impulses or disturbance on incremental channel B.
Solution: Check the connection of the encoder-drive channel B, check the connection of the screen, check the encoder supply voltage, check parameter
2102 Encoder supply.
2 0x04 CHZ Cause: no impulses or disturbance on incremental channel Z.
Solution: Check the connection of the encoder-drive channel Z, check the connection of the screen, check the encoder supply voltage, check parameter
2102 Encoder supply, check parameter 2110 Encoder signal check
Speed fbk loss [22] alarm with sinusoidal incremental encoder
Bit Value Name Description
3 0x08 MOD_INCR Cause: voltage level not correct or disturbance on signals of incremental channels A-B.
Solution: Check the connection of the encoder-drive channels A-B, check the connection of the screen, check the encoder supply voltage, check
parameter 2102 Encoder supply.
The reasons for activating the Speed fbk loss alarm and the information acquired by the encoder are shown in
parameter 2172 SpdFbkLoss code.
If no card has been installed the Speed fbk loss [22] alarm is generated and no cause is displayed in parameter 2172
SpdFbkLoss code. Several causes may be present at the same time.
If no card is recognised, the system runs a routine that always returns Speed fbk loss [22] active without specifying a
cause.
Setup is performed each time the drive is turned on, regardless of the regulation mode that has been selected. If an
error is detected during setup the Encoder error alarm is generated with the following codes:
Bit Value Name Description
8 0x100 Setup error Cause: An error occurred during setup. When this has been signalled the information obtained from the encoder is not reliable.
Solution: Take the action recommended for Speed fbk loss [22] alarm according to the type of encoder.
9 0x200
Compatibility
error
Cause: Firmware on option card incompatible with firmware on regulation card.
When this has been signalled the information obtained from the encoder is not reliable.
Solution: Contact Gefran in order to update the firmware on the optional card.
If an error occurs during the setup phase, "Encoder error" is displayed with subcode 0x0100 - 256 (Setup error).
If the selected regulation mode use an encoder as a speed feedback, a " alarm is also generated with
the code "SpdFbkLoss code" 0x0100-256 (Setup error).
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