4
3) Once Register #48 (Unlock Controls) has been written, Controls are unlocked until Register #1 bit 1 (Lock Bit) has
been written, Watchdog Timeout occurs or terminal TB1 is opened.
4) Writing to Register #1 (Drive Control) with bit 1 set will Lock both controls and Parameters (prevents writing to any
register).
5) The serial drive control can be unlocked only if terminal TB1 is closed and the drive is not in programming mode.
6) When LOCK is asserted, the drive drops out of SERIAL control and reverts back to the previous source of control.
7) Even though the drive might be locked, and thus parameters and control cannot be written, parameters and status can
always be read. See section (G) below.
E) Unlocking & Locking Programming Parameters only
1) Writing to any writeable register other than #1 and #40 (keypad speed) is enabled by writing the Drive’s Programming
Password to Register #49 (Unlock Parameter). This is done when Drive Control (start, stop, etc.) and keypad speed
control (reg. #40) is not required.
2) The factory default password is 225.
3) Once Register #49 (Unlock Parameters) has been written, the writing of parameter registers is unlocked until Register #1
bit 1 (Lock Bit) has been set.
F) Watchdog Timer
1) All Minarik drives are equipped with a Serial Link “Watchdog Timer”. If the Modbus master wishes to control the drive
(start, stop, forward, reverse, etc.) it must first “Unlock Controls” (See “D” on page 4). If the Watchdog Timer is
enabled and controls have been unlocked, the Master MUST PERIODICALLY COMMUNICATE with the drive or the
timer will timeout. A Watchdog timeout forces the drive to stop because it is assumed that the failure of periodic
communications with the drive could be a loss of the serial link with the accompanying loss of ability to command the
drive to stop. The Watchdog Timer does not operate unless Controls have been UNLOCKED via Register #48, or
parameters writing have been unlocked via Register #49. In case of unlocking parameters only, watchdog timer will
disable write permission but will not stop the drive.
2) Watchdog Timer Controls
a) For some applications, it is inappropriate to shut down the drive because of a Watchdog Timeout.
Therefore, we have provided a means of disabling the Watchdog using Programming Parameter #15
(SERIAL LINK):
Programming Parameter #15 controls both the enabling of the serial link and the Watchdog. By
setting Parameter #15 to one of the selections WITH TIMER enables the serial link WITH the
Watchdog. Conversely, setting Parameter #15 to WITHOUT TIMER enables the serial link
WITHOUT the Watchdog.
b) If the Watchdog Timer has been disabled, the Unlock Control Register #48 or Unlock Writing Register #49
must still be asserted in order to write to Register #1 (Drive Control) or to any of the programming
parameters (in case of unlocking writing). However, there are no longer any constraints on how often the
Master must communicate with the drive.
G) Monitoring Only Operation
1) Power up the drive in TERMINAL mode with serial enabled.
2) Simply read Minarik Register #24 (Modbus Register #25) or any other readable register.
3) No unlocking or watchdog issues apply for monitoring.
H) Normal Control Operation Sequence
1) Power up drive with serial enabled and TB1 closed.
2) Unlock control by writing a zero to Register #48.
3) Control drive operation via various commands to Register #1 (Start, Stop, Reverse direction, etc.) and change the
keypad command speed by writing to Register #40.
NOTE: Drive must be in “MANUAL” (see Register #1 [drive control]) and Parameter #5 (standard speed
source) must be set to 01 (keypad) in order to control speed via Register #40.
Minarik R 901 E. Thompson Ave. R Glendale, CA 91201 R Ph: (800)646-2745 R Fax: (800) 394-6334 R www.minarikcorp.com
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