Relays; General Introduction; Relay Functions; Alarm - Siemens HydroRanger 200 HMI Operating Instructions Manual

Relays

Relays are the primary controls of external devices such as pumps or alarms. The
HydroRanger 200 HMI comes with extensive functions for relays.

General introduction

The HydroRanger 200 HMI has six relays. Each one may be independently assigned to
one function and has a corresponding status icon on the LCD.
The functions fall under three modes of operation:
Mode

Alarm

Pump
Miscellaneous

Relay functions

Each relay on the HydroRanger 200 HMI can be programmed for a wide range of
functions according to your application needs. The available function categories are
Alarms, Pumps, Totalizing and Sampling, and Miscellaneous.
Setpoint - ON/OFF
If the ON setpoint is higher than the OFF setpoint, the relay operates as:
• High alarm
• Pump down control
If the ON setpoint is lower than the OFF setpoint, the relay operates as:
• Low alarm
• Pump up control
The ON and OFF setpoints can not be the same on an individual relay but may be common
to other relays. The dead band or hysteresis is the difference between the ON and OFF
setpoints. For in and out of bounds level alarms, the hysteresis is set at ± 2 % of span
from either boundary.
Alarm
Level
In high alarm, the alarm is activated when the level rises to the ON setpoint and turns off
when the level lowers to the OFF setpoint. In low alarm, the alarm is activated when the
level lowers to the ON setpoint and turns off when the level rises to the OFF setpoint.
In-bounds
The relay will be in alarm if the level is inside the zone between the setpoints.
A5E36281317
Alarm ON = LCD Icon ON
Pump ON = LCD Icon ON
Contact closed = LCD Icon ON
HydroRanger 200 HMI – OPERATING INSTRUCTIONS
Function
= relay coil de-energized
= relay coil energized
= relay coil energized
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