Watchdog NTC to F500 PGW CAI REV0 July 2014
Several different conditions may occur at the same time whilst the Watchdog is
operating. If the Watchdog is running within calibrated range but also detects a motion
sensor fault then the information returned may look something like this.
‘2463’ Running at 99% of calibrated speed.
Followed three seconds later by
2D--’ Misalignment detected at the top of the elevator.
Followed three seconds later by
‘3CAA’ Persistent alarm, 170 seconds to go.
The messages would then repeat with any new values in the status data field.
Due to some limitations in the speeds involved in updating the Watchdog information,
rapid changed of data could be missed or be present for only a very short period of time.
If the Watchdog is placed in one of the two test modes, the messages below will be
returned in the following order.
The first two bytes show the speed data and the second two
bytes show the status and status data.
Over speed Stop as a percentage of calibrated speed.
Over speed Alarm as a percentage of calibrated speed.
The actual calibrated speed
Under speed Alarm as a percentage of calibrated speed.
Under speed Stop as a percentage of calibrated speed.
Performing internal test.
Codes 4C and 4D are only returned if the extended test is in operation.
Under speed alarm and stop in % (Byte 7, 6)
These two bytes show (in % of calibrated speed) the under speed alarm and stop levels.
These represent the point at which the Watchdog will generate an alarm or stop condition.
Example, if byte 7 is ‘0A’ and byte 6 is ‘14’ then this means that the Watchdog will
generate an under speed alarm at 10% (0A) below calibrated speed and will generate a
stop condition at 20% (14) below the calibrated speed.
Over speed alarm and stop in % (Byte 9, 8)
These two bytes show (in % of calibrated speed) the over speed alarm and stop levels.
These represent the point at which the Watchdog will generate an alarm or stop condition.
Example, if byte 7 is ‘0A’ and byte 6 is ‘14’ then this means that the Watchdog will
generate an over speed alarm at 10% (0A) above calibrated speed and will generate a stop
condition at 20% (14) above the calibrated speed.
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