32
Divisor for uptime counter:
The divisor must be selected to give the desired units for uptime:
Units
Divisor
seconds
1
hours
3600
days
86400
Input is inverted:
Normally an open input circuit signifies the OFF state, while a closed input circuit (input connected
to chassis) means the ON state. Pulse acquisition then occurs at the change from ON to OFF.
With an inverted input, an open circuit signifies the ON state, while a closed input circuit means the
OFF state. Pulse acquisition then occurs at the change from OFF to ON.
This inversion does not affect the LEDs on the PQM 1588. These always show the state directly at
the input, i.e. an LED always lights up when it is connected to the chassis (signal ground).
Debounce time:
The debounce time prevents several pulses being counted due to a relay contact bouncing when
it closes.
It specifies the minimum period between two changes of state. If a change of state occurs in a
period of time less than the set debounce time, it will be ignored. The debounce time is set at
20 ms in the factory and normally does not need to be changed.
Counter added to or subtracted from group n:
The counter reading of each of the 6 inputs can be added to or subtracted from one of the 3
available group counters. In addition, the derived variables from the counters of a group can be
combined arithmetically to a give a group value.
A typical example of when this function is useful is when the active energy consumption of 3
departments is to be recorded, but only Departments 1 and 2 have their own individual counters,
although there is a counter for the combined consumption. The energy consumption of Depart-
ment 3 can then be calculated from a group counter, i.e. W
3
= W
total
- W
1
- W
2
.
The ‘Total’ counter is added to group n.
The ‘Department 1’ counter is subtracted from group n.
The ‘Department 2’ counter is subtracted from group n.
The group counter n then corresponds to the energy consumption of Department 3.
7.3.5.1.3.1 General settings:
Name of counter group 1–3:
If a counter has been assigned to a group, the name for the consumption figure of the group can
be entered here.
Name of variable for group 1–3
If a counter has been assigned to a group, the name for the arithmetically combined derived varia-
ble of the group can be entered here.
