Lenze smd Series Drives - Manual (Page 14)

RG-SDMOD 10
Drive Setup & Operation
4.5 Unlocking & Locking Controls
Registers #48 and #1 are used in Unlocking and Locking Controls.
• A write to Register #48 (Unlock Controls) with a value of 0 will unlock controls. This enables the writing
of Register #1 – the Drive Control Register and register #40 (keypad speed command).
Note: C01 must be set to either 10 or 11 in order to unlock serial control.
• If Register #48 (Unlock Controls) is written with a value that is the Drive’s Programming Password,
C94, then in addition to Register #1(Drive Control), writing to all other writeable registers is enabled
(e.g.: parameter C37 -- Preset Speed #1). The factory default password for
smd series drives is 0.
• Once Register #48 (Unlock Controls) has been written, Controls are unlocked until Register#1 bit 1
(Lock Bit) has been written, Parameter C01 is changed to a value different than 10 or 11, the drive is
powered down or a serial timeout occurs.
• Writing to Register #1 (Drive Control) with bit 1 set will Lock both Controls and Parameters (prevents
writing to any register).
• When LOCK is asserted, the drive drops out of SERIAL control. After receiving the WRITE message
when serial control is locked, the drive will return exception code 01.
• Even though drive might be locked, and thus parameters and control cannot be written, parameters
and status can always be read. Refer to section 4.7, Monitoring Only Operation .
4.6 Unlocking & Locking Programming Parameters only
Registers #49 and #1 are used in Unlocking and Locking Programming Parameters.
• Writing to any writeable register other than #1 can be enabled by writing the Drive’s Programming
Password (C94) to Register #49 (Unlock Parameters). This would be done when Drive Control (start,
stop, etc.) is not required.
• The Factory Default password is 0.
• Once Register #49 (Unlock Parameters) has been written, the writing of parameter registers is unlocked
until Register #1bit 1 (Lock Bit) has been set or the drive experiences a serial timeout.
4.7 Monitoring Only Operation
1. Power up drive.
2. Set parameter C01 (Control Source Setpoint) to selection 8 or 9.
3. Simply read smd Register #24 (Modbus Register #25) or any other readable register.
4. No unlocking or watchdog issues apply for monitoring.