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6. Alarm System (optional)
PMAC735A-/B- provides multiple relay alarm outputs, any of which can work independently and
support the user’s programming.
Any of the relay output that has been set at local control mode corresponds to alarm about voltage
or current. Each alarm needs 5 parameters programmed, as shown in the table below:
Operation-object
0 – Prohibit
1 - Maximum value of three-phase voltage
2 - Minimum value of three-phase voltage
3 - Maximum value of three-phase line voltage
4 - Minimum value of three-phase line voltage
5 - Maximum value of three-phase current
6 - Minimum value of three-phase current
Operation upper
limit value
0% - 120% of rated value
Operation lower
limit value
0% - 120% of rated value
Operation time
delay
0 – 1200s; 0 means that the relay operates immediately.
Return time
0 – 1200s; 0 means no return.
For example, the user needs to monitor whether there is under-voltage in three phases. If there is
under-voltage in any phase, alarm will be given immediately until normal voltage is resumed.
Then, programming can be carried out according to the following settings:
Operation-object: Minimum value of three-phase voltage