Load Controller Inputs - Siemens LME7 Series Basic Documentation

Building Technologies
HVAC Products
18.4

Load controller inputs

18.4.1 3-position step input X5-03
The load controller input is valued by making a 2-out-of-3 section. This means that to
trigger a control action via the actuator outputs, an ON or OFF signal must be identified
within at least 2 successive cycles. As a result of this sampling process, an ON or OFF
signal must be present for a time between minimum 0.3 seconds and maximum
0.45 seconds to produce an output signal change at the LME7...
18.4.2 Analog input X65
The LME7... handles the analog input signals with the help of an 8-bit A/D converter.
18.4.3 Selection source preset output analog / 3-position
step input (P654)
The following input signals can be selected and handled via parameter P654
•
3-position step input (feedback potentiometer ASZxx.3x required / dependent on
program sequence))
•
0...10 V
• 0...135 Ω
•
0...20 mA
•
4...20 mA with lockout at I <4 mA (AZL2...: Loc: 60)
•
4...20 mA
18.4.4 Actuator output X2-09
The actuators are powered by mains voltage delivered directly via the LME7...
18.4.5 Setting maximum running time of the actuator (P259 /
P260 timeout)
Parameters P259 and P260 are used to set the actuator's running time in accordance
with the type of actuator used. The time set must at least correspond to the running
time required by the actuator to travel from the fully CLOSED to the high-fire position
(e.g. 30 seconds for 90°). If the actuator does not reach its position within this period of
time, the LME7... will initiate lockout
Basic Documentation LME7...
18 Multistage or modulating mode
68/164
CC1P7105en
13.10.2009