TB Wood's WFC1000 Series, Инструкции по установке, эксплуатации и обслуживанию

Страница: 61 / 82

53
WCK-01/02/03/04 – Chassis Mounting Kits
This option allows the WFC
HT Series Inverter to be mounted with the heat sink fins protruding through the back
of another enclosure. This mounting scheme allows the cabinet size to be minimized since most of the energy
dissipated by the inverter will be channeled through the fins to the outside of the cabinet. Gasketing is supplied
to allow the package to maintain its environmental integrity. The WCK01 Chassis Mounting Kit fits all models
through 5 HP; the WCK02 fits 460 VAC models from 7.5 through 20 HP and 230 VAC models 7-1/2 and 10
HP. WCK03 is used for the 20 HP 230 VAC and 25-30 HP 460 VAC models. WCK04 is used for the 25 HP
230 VAC and 40-75 HP 460 VAC models.
SIOC01 – Serial Interface Converter
This is a stand-alone converter module which will translate the RS232 communications protocol used in many
personal computers to the industrial RS485 protocol used in the WFC
HT Series Inverter.
6.3 Application Hints
A number of typical applications have proven to require further explanation. Several typical applications are
summarized in the following paragraphs.
Use of Motor Starters with the WFC HT
A frequent application of inverters is in previously fixed speed, uni-directional applications where the motors
are controlled by electromagnetic starters. The WFC
HT
Series is compatible with this kind of operation,
providing the start/stop cycle time does not exceed 30 times per hour (1 start/2 minutes).
Connect the contactor on the line side of the inverter. Set parameter 21-MODE for terminal run/stop control
and install a wire jumper or maintained contact between Terminals FWD & +24. Finally, set parameter
82-START to a data code that defeats the standard line start lockout feature.
If the contactor must be installed on the inverter’s output to conform with local electrical codes or some other
compelling reason, it must be interlocked to the WFC
HT to shut it down when the starter opens for any reason.
This can be accomplished by connecting a normally closed auxiliary of the motor starter to Terminals CTS &
+24 on the WFC
HT . When the contactor opens, the auxiliary will close forcing the inverter to turn off without a
deceleration ramp. NOTE: IF TRIPS OCCUR, A SPECIAL SNUBBER NETWORK MAY NEED TO BE
INSTALLED ACROSS THE CONTACTS; CONSULT THE FACTORY.
Defeating the Keypad
The inverter’s standard keypad is designed to give full functional control for most applications. This may be
prohibitive in some cases. If a remote station is to have exclusive control of speed and direction commands,
set 21-MODE to code 4 or 14. The keypad stop key will remain active as both an EMERGENCY STOP button
and a fault RESET mechanism. To defeat the E-STOP function, set parameter 82-START to a value greater
than 3, being careful to observe the other ramifications of the selection (ability to start a rotating motor & line
start lockout).
An access code may be assigned to prohibit unauthorized program revision. See parameter 87-ACODE for
more information.
Finally, if absolutely necessary, the entire keypad may be removed for total isolation of the control. Install a
WBP01 in place of the keypad on enclosed models to maintain the NEMA 4 integrity.
Master/Slave Control of Multiple Inverters with Ratio Adjust
A series of master and slave controls is quite common in industrial processes. Most are uni-directional
applications. Frequently, it is necessary that they not all run at exactly the same speed. With the WFC
HT Series,
this kind of control is possible even while maintaining the use of one standard keypad for system control. This
scheme requires control reprogramming to reset the speed ratio of the followers, however.
To accomplish full system control from the master’s keypad, the following program changes must be made:
Master – 75-STR = 5 88-FRO = 0 Slave(s) – 21-MODE = 4 24-FSEL = 3 75-STR = 1
Parameter A2-RATIO on each drive will be used to set the speed ratio of each follower to the master’s speed.
To get the speed to follow each other in a ratio sequence, connect Terminal 6FS on the master to each of the
follower’s VIN terminals and Terminal COM on all the drives together. To achieve common direction command,
connect the FWD terminals on all slaves together with the normally open auxiliary relay on the master and
connect the common connection of the master’s auxiliary relay to its Te24.
To achieve fault interlocking for all the drives, connect the normally closed auxiliary relay contacts on all the
follower drives in series back to Ter24 and MOL on the master. This will cause the fault on any slave
to shut down the master and the entire system.
Conclusion
Refer to the individual programming parameters listed throughout the manual to define the impact of each
program change. An Electrical Applications Engineer is available to discuss these applications or your
particular needs daily. See the contact information on the back of the manual.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com