Function of VS 300
26
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
Time
ZNR. 51203
63 530 E0
VS 300 Speed adjuster cutoff
Enabling
speed adjuster
Minimal
speed
Basic + variable
load time
Input signal[V]
Control
Request
Control can be influenced by three parameters:
‐ Minimum speed of frequency changer with continuous control
‐ Adjusting differential/regulating speed of analog output
‐ Maximum temperature with speed control
These parameters are only displayed when speed or combined control is activated as the control
type (see section 8.1.8 Parameter List S3: Common Setpoints for System Configuration).
The Minimum Speed parameter can be used to define minimum speed for the speed adjuster. Entry is made in
percent for the 0-10 V analog output of the VS 300. Controller speed can be set by the Analog Output Regulat
ing Speed parameter.
The value must be increased if the controller is too slow and should be decreased if hunting occurs. One or two
relay/control stages can be allocated to one speed controller. If only one stage is allocated, it is used for en
abling/disabling of the frequency changer. When two stages are allocated to the controller, the first is used for
enabling/disabling and the second to actuate a frequency changer bypass.
The connected compressor then runs at constant speed (line frequency) bypassing the frequency changer. If
the limit entered as maximum temperature with speed control is exceeded and a second relay/control stage is
allocated to the speed controller, this second stage (bypass) will be activated and the first stage disabled (en
abling of frequency changer).
On attaining the defined t
0
setpoint, the controller returns to control mode (bypass off, enabling of frequency
changer on).
When parameters are set for a bypass stage, the stage must always be connected, since enabling of
the speed adjuster is disabled at high temperature!
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