10.2 Blower Drive System—EC Fans
WARNING! Risk of electric shock. Can cause serious injury or death. Open all local and remote
electric power-supply disconnect switches and verify with a voltmeter that power is off before
opening the fan motor electric-connection enclosure. Use only fully-trained and qualified HVAC
technicians to replace or perform maintenance on the EC fans.
CAUTION: Risk of contact with hot surfaces. Can cause burn injury. The EC fans, electronics
housing, humidifier pan and water contained within are extremely hot during operation. Allow
sufficient time for them to cool to a touch-safe temperature before handling. Use extreme
caution and wear appropriate, OSHA-approved PPE when replacing or performing maintenance
on the EC fans.
CAUTION: Risk of improper moving, lifting and handling. Can cause equipment damage or
injury. Only properly trained and qualified personnel should work on this equipment. Fan
modules weigh in excess of 125-lb (56.7-kg). Use proper lifting techniques and wear
appropriate, OSHA-approved PPE to avoid injury and dropping the fan module during removal.
Equipment used in handling/lifting, and/or installing the fan assembly must meet OSHA
requirements. Use handling/lifting equipment rated for the weight of the fan assembly. Use
ladders rated for the weight of the fan assembly and technicians if used during installation.
Refer to handling/lifting, and/or installation equipment operating manual for manufacturer's
safety requirements and operating procedures.
NOTICE
Risk of improper power-supply connection. Can cause equipment damage and loss of warranty
coverage.
Prior to connecting any equipment to a main or alternate power source (for example: back-up
generator systems) for start-up, commissioning, testing, or normal operation, ensure that these
sources are correctly adjusted to the nameplate voltage and frequency of all equipment to be
connected. In general, power-source voltages should be stabilized and regulated to within
±10% of the load nameplate nominal voltage. Also, ensure that no three-phase sources are
single-phased at any time.
NOTICE
Risk of improper installation. Can cause equipment damage.
Only a properly trained and qualified technician should install or open this motor.
Use 60/75°C Class 1 copper wire only.
10.2.1 Protective Features
Monitoring functions protect the motor against overtemperature of electronics, overtemperature of motor
and incorrect rotor position detection. With any of these failures, an alarm will display through the
Liebert® iCOM controller and the motor stops electronically. There is no automatic restart. The power
must be switched off for a minimum of 20 seconds once the motor is at a standstill.
The motor also provides locked rotor protection, undervoltage/phase failure detection and motor current
limitation. These conditions will display an alarm through the Liebert® iCOM.
Vertiv | Liebert® DSE™ Installer/User Guide
56
To Next Page
Loading...
