Endress+Hauser RMA42, Руководство по эксплуатации

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RMA42 Commissioning
Hauser 25
6.4.5 Step 5: Configuring the relays, assigning and monitoring limit
values
As an option, the device has two relays with limit values, which are either switched off, or can be
assigned to the input signal or the linearized value of analog input 1 or 2 or the calculated values.
The limit value is entered as a numerical value including the position of the decimal point. Limit
values are always assigned to a relay. Each relay can be assigned to a channel or a calculated value.
In the "Error" mode, the relay functions as a fault indicator relay and switches for every fault or
alarm.
The following settings can be made for each of the two limit values: assignment, function, set point,
hysteresis, operating mode
1)
, time delay
1)
and failure mode
1)
.
Please configure the following parameters to activate the function of the limit value monitoring
system or the relays:
"
Caution!
Please note special situations if both the hysteresis and the delay time should be activated
simultaneously (see the following description in the Operating modes section).
!
Note!
Following a power failure, the limit value monitoring system behaves as if the limit value had not
been active before the power failure, i.e. the hysteresis and any delay are reset.
Relay specification
1) can only be set in the menu Expert/Output/Relay
Setup
Relay 1
Relay 2
Assignment:
Which value should be monitored?
Off , Analog input 1, Analog input 2, Calc value 1, Calc value 2, Error
Function:
Operating mode of the relay (for a
description, see "Operating modes")
Min. , Max., Gradient, Out-band, In-band
Set point:
Set point 2:
Limit value
Enter the limit value with the position of the decimal point. Set point 2 is only displayed for outband and inband.
Time base:
Time base of gradient calculation
Enter the time base in seconds.
Only for operating mode Gradient.
Hysteresis
Hysteresis. The switch point can be
controlled by means of a hysteresis
for every limit value.
The hysteresis is configured as an absolute value (only positive values) in the unit of the channel in question (e.g. upper
limit value = 100m, hysteresis = 1m: limit value on = 100m, limit value off = 99m)
Relay contact Changeover
Maximum contact burden DC 30 V / 3 A (permanent state, without destruction of the input)
Maximum contact burden AC 250 V / 3 A (permanent state, without destruction of the input)
Minimum contact load 500 mW (12 V / 10 mA)
Galvanic isolation towards all other circuits Test voltage 1500V AC
Switching cycles > 1 million
Default setting Normally closed: Rest contact Rx1/Rx2