Parameter description:
The following values can change the equipment characteristics
and are therefore to be set with utmost care.
A1-A6: Function of contact K1-K6 at sensor error
In case of sensor error (open or short circuit) the display shows “F1-“ flashing. At sensor error the
respective relay falls back into the condition pre-set here.
A10: Selection setpoint 2 or DeltaW1
A11: Selection setpoint 3 or DeltaW2
A12: Selection setpoint 4 or DeltaW3
A13: Selection setpoint 5 or DeltaW4
A14: Selection setpoint 6 or DeltaW5
These parameters determine whether the setpoints for thermostat 1 and those of thermostat 2-6
are independently adjustable (Ax=0) or whether they are tied with one another via a switching
offset DeltaW (Ax=1). (see parameter P1-P5)
A15: Display value
The display can indicate either a temperature or a pressure value. Measured value and indicated
value must not be identical, therefore a calculated value can be indicated also. The measuring
input is set with parameter A35. The calculation of the corresponding value depends on the
selected refrigerant according to the setting of parameter A37.
A16: Display mode
The value can be indicated with or without decimals. In general, all parameter indications are
presented in 0.1°K
A17: Alarm mode
The alarm exit evaluates an upper and a lower limit value, whereas a selection is possible as to
whether the alarm is a boundary or a range alarm and weather it has absolute or relative limit
values.
A18: Special function at alarm
Here can be selected whether, in the case of an alarm, the indication is to flash.
A20-A25: Minimum action time contact K1-K6 "Off"
These parameters permit a delay in switching on the relay in order to reduce the switching
frequency. The adjusted time sets the entire minimum time period for a switching-off phase.
A30: Mutual delay of contacts
This parameter makes a mutual switching-on delay of relays possible, depending on whichever
contact is switched first. It ensures that two output contacts do not switch simultaneously. If there
are multiple bypass groups defined with parameter A44 the mutual delay affects entire groups. The
mutual delay affects no free contacts that are not involved in the load replacement. With A44=0 the
delay is always effective.
A31: Delay after “Power-on”
This parameter allows a switching-on delay of relays after switching-on the mains voltage. This
delay corresponds with the time set here. A mutual delay set by parameter A30 becomes effective
as soon as the first contact is switched on. The delay applies not to alarm contact K7
A32: Alarm suppression after "Power-On"
If boundary alarm is selected with parameter A17 this parameter allows a switching-on delay of the
alarm contact K7 after switching on the mains voltage. This delay corresponds with the time set
Summary of Contents for ST710-PWHVM.26
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