Chapter 4. Start-Up; Start-Up; System Status Display; Functionality - Helios LZD Series Installation And Operating Instructions Manual

Installation and Operating Instructions
UK
CHAPTER 4

START-UP

CAUTION
NOTE
NOTE
Bearing Condition Diagnostic System LZD ...
4.0 Start-up
Once the bearing condition diagnostic system has been connected, it is immediately operational.
Parameterisation is no longer necessary!
When starting up the fan, only the functionality (permanently lit LED) of the bearing condition diagnostic system should
be checked.
– Start sequence
The greed LED flashes during the set start sequence of 2 minutes. The system status will be recorded and transmitted
for the first time after this sequence and then continuously. The aim is to remove transient faults in the signal levels for a
previously started object to be monitored (fan).
The evaluation of the bearing conditions may only take place once the motor's steady state has been reached.
A complete warm-up phase is required in order to reach the motor's steady state. The duration of the warm-up phase
depends on various influencing variables and last at least 60-75 minutes in each case. In particular, the motor bearings
require a longer running time until the steady state is reached.
If the evaluation of the bearing conditions takes place directly after the fan is switched on, the missing operating tem-
perature of the motor and motor bearings can lead to an erroneous evaluation of the bearing conditions.
4.1

System status display

LED Function Status
green continuous "OK"
flashing
yellow continuous "WARNING"
flashing
red continuous "ALARM"
flashing
The LZD evaluation unit has no fault memory, i.e. the status display is direct and continuous.
Up to 4 diagnostic features are evaluated:
1. Mechanical bearing condition:
2. Bearing temperature:
As soon as a diagnostic feature has reached the level "WARNING" or "ALARM", the relevant status message will be is-
sued. This is independent of the other individual conditions.
In this respect, the "ALARM" status has higher priority.
4.2

Functionality

– (Mech.) bearing condition with LZD Basic/LZD Comfort
Continuous query and evaluation of the connected sensor for recording the vibration acceleration.
In case of frequency inverter operation of the fan to be monitored, the evaluation of the bearing conditions is
not possible!
– Bearing temperatures (optional) with LZD Comfort
Cyclical query and evaluation of the external PT100 sensors installed in the motor in the temperature range from
-20 ... +150 °C using absolute temperature limits and a temperature difference between both bearing points.
– Procedure
1. Temperature-dependent start of bearing and vibration evaluation
2. Provision of measured values and alarm states as Modbus RTU Slave
3. Parameterisation of unit via Modbus
4. Specification of limit temperatures and steady-state temperature via Modbus
5. Adjustable waiting time until measurement from the system start
6. Continuous requests for measurements
7. Vibrations, e.g. caused by fan imbalance, shall not affect the bearing condition display, as these vibrations are low-
frequency.
– Limit value specification
via MODBUS RTU
– Status issue
via MODBUS RTU
System status
The roller bearing (LZD Basic) and the bearing grease (LZD Comfort) are in
proper condition.
--> Bearing is functional
--> Maintenance intervals pursuant to fan maintenance plan
--> Bearing replacement is not recommended!
Wait for steady state – (Start sequence) No action necessary
The roller bearing (LZD Basic) and the bearing grease (LZD Comfort) are still
acceptable.
--> Bearing is still functional
--> Halving the maintenance intervals is recommended!
Temperature of unit outside the defined range
--> Wait until outdoor temp. has cooled down and repeat measurement.
The roller bearing (LZD Basic) and/or the bearing grease (LZD Comfort) are
not in proper condition.
--> Bearing is not functional
--> Immediate bearing replacement is recommended!
Error with sensor or bearing diagnosis.
--> Contact manufacturer!
Vibration acceleration Sensor 1 and Sensor 2 (LZD Basic and LZD Comfort)
PT100 sensors (LZD Comfort)
6