Eaton easyE4 User Manual

6. Function blocks
6.1 Manufacturer function blocks
If the off duration of the pulse at the output is shorter than the minimum off duration,
Q1 or Q2 will remain in a state of "1" (ON). The status of the PW..E1 contact must be
observed.
Parameter limits for period duration and minimum ON duration
 Period duration
[ms]

Minimum On dur-
ation [ms]

Note
Basic device
    
EASY-E4-UC-...
EASY-E4-DC-...
EASY-E4-AC-...
Min. 5
Max. 65535
 min. 0.1
1)
Max. 65535
 Period duration
When the value is
0, no pulses are out-
put at Q1 and Q2.
minimum contact
closing time
Can be selected
within the valid lim-
its
1) For devices with transistor outputs
Tab. 84: Parameter limit values for period duration and minimum on duration
Minimum period duration PD
The minimum period duration is 5 ms.
Minimum on duration ME = Minimum off duration
If the calculated on duration pulse width is shorter than the minimum on duration ME,
a pulse will not be output at Q1/Q2.
If the calculated off duration is shorter than the minimum off duration ME, output
Q1/Q2 will remain on.
The following applies when driving contactors: Select the shortest possible minimum
contact closing time ME, but make sure it is still longer than the contactor switching
time (300 ms, for example). Select the longest possible period duration in order to
reduce contactor wear. One possible use is a heater controller.
If the duration is below the set minimum on duration or minimum off duration, the
Boolean control output E1 is set to 1. This control output E1 is used for monitoring dur-
ing commissioning and does not have to be connected.
Period duration to minimum ON duration ratio
The ratio of the period duration/minimum on duration (PD/ME) determines which per-
centage of manipulated variables have no effect.
Because of this, the minimum on duration must be as short as possible and the
period duration as long as possible so that PD/ME will be as large as possible.
Assigning operands
You can assign the following operands to the function block inputs that are numeric
inputs.
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Eaton easyE4 Specifications

General

Brand	Eaton
Model	easyE4
Category	Relays
Language	English