Instruction Manual T601
JAQUET AG
Revision: 004
59/73
8.4.8 Relay and Open Collector Latch Function
Relays and Open Collectors can be assigned a latch function. If a signal arrives from the assigned function the
relay / OC is latched and remains latched until reset via binary input or the <Exec> button.
Where fail safe mode is selected the deactivated Relay / Open Collector state is held.
8.4.9 Analog Output
If an analog time constant higher than zero is set, with measurement
interval of 2ms, then the max. frequency that can be measured is
35kHz.
To measure frequencies higher than 35kHz with time constant higher
than zero, a min. measurement interval of 5ms must be selected.
If Sensor Alarm is active that influences the analog output, which assumes the error condition:
Configuration
Output current
0 .. 20mA
21mA
4 .. 20mA
4mA
8.5 Fault behaviour
8.5.1 Sensor error
The sensors may be monitored in 3 ways.
•
Sensor powered by the T601
– Sensor supply current monitoring.
If the current falls outside of the defined range then static error is signalled.
•
Sensor not powered by the T601
– wire break detection.
Static error is signalled when wire breakage occurs. (Impedance measurement of 2 wire sensor)
•
2 speed sensors connected
– Dynamic sensor monitoring, i.e. the 2 signals may be compared. If the
values differ by more than the defined tolerance, dynamic error is signalled.
The T601 behaviour in the event of a sensor fault is a function of the software configuration. If sensor
monitoring is selected, a fault causes the LED to go off and the analog output (both) go to error status. The
relay and open collector behaviour is a function of the configuration.
8.5.2 System alarm
The microprocessor continuously monitors the following functions for errors: Supply, math functions of the
micro controller, RAM, EEPROM.
In the event of a fault the relays are de-activated, the current output goes to 2mA (4-20mA) or 21mA
respectively and the Open Collectors become high resistance if assigned to a function other than frequency
output. The T601 then initializes and attempts to run again.
8.6 Power failure
If the power fails for longer than the bridging time the outputs are de-activated, i.e. Analog outputs go to 0mA,
relays de-activate and the Open Collectors go to high resistance.
As soon as the supply returns to the minimum required the T601 recommences its initialization routine.
