Magnetek IMPULSE VG+ Series 3, Инструкция по эксплуатации, Страница: 75 / 183

IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
5-22
Figure 5-15: Lower Limit 2 (LL2)
LL2 Input
Frequency
Output
Run (FWD)
Command
Run (REV)
Command
C3-07=0 (Decel to stop)
(N.O.)
Load Sharing/Torque Following—2 or more mechanically coupled motors
The VG+ Series 3 Software allows one or more Impulse VG+ Series 3 driven motors to be connected in a Master/
Slave fashion such that slave inverter will follow the torque reference of the master inverter. It can be configured in
two ways, either as a dedicated Slave or as a Master/Slave that can be switched on or off by multi-function input.
When it is in Load Share Mode (Slave), it is essentially nothing more than a torque helper to the master motor. The
Master Inverter outputs the commanded amount of torque from a ± 10V analog signal into the Slave inverter, which
correlates directly to the direction and quantity of torque the slave inverter should apply to it’s own motor. This can
be particularly useful when two or more motors are driving a common load (i.e. single drum, gear box, etc.) and it is
important that they share the load. This will allow one inverter/motor to handle the speed reference and speed
regulation while the others simply “help” the master. This overcomes inherent problems with having more than one
inverter/motor trying to regulate speed on a common load. The Load Sharing function can be used when the master is
configured for Hoist or Traverse motions (i.e. for a hoist motion, two or more motors coupled to a single gearbox.)
For a traverse motion, a circular crane, multiple motors driving a single end truck, cable reel, etc.
Note : The master
drive can be of an Impulse VG+ Series 1, 2 or 3 generation.
When using Multi-function input H1-0x = ”66”—Load Share 0/1 (Torque Following mode), setting C3-10 =
Enabled will allow the inverter to accept the Limit Switch inputs where H1-0x = 6 ~ D. When C3-10 = Disabled
(Factory Default), the Slave inverter will ignore any change in state of the Limit switch inputs. The setting of this
parameter is only in effect when the Multi-function input H1-0x = “66” Load Share 0/1 is
ON . It is important to
understand that when in a Load Sharing mode, the Slave inverter is only supplying torque to “help” the Master
inverter. The master inverter generally handles the logic of limit switches or other special functions. If this is not the
case, each inverter may try to move or decelerate at a different speed placing extra strain on the drive train and
potentially resulting in a speed deviation fault.
Notes:
1. The Limit Switch stopping method is not selectable in Load Sharing mode. If a Stop Limit is input, the output
is turned off and the brake output will set immediately.
2. Weight Limit Input (12, 62) — Upper Limit 3 is always active regardless of the setting of parameter
C3-10.
Minimum Programming Requirement for “Load Sharing” Operation
1. The Master and Slave drives must be programmed for the Flux Vector control method, A1-02 = 3.
2. The Slave drive requires a Multi-function Digital Input programmed for 66 — ‘Load Share 0/1’
3. The Slave drive requires a ±10V Multi-function Analog Input programmed for 13 — ‘Torque Reference’.
4. The Master drive requires a Multi-function Digital Output programmed for 2A — ‘During Run 1’.
5. The Master drive requires a ±10V Multi-function Analog Output programmed for 9 — ‘Torque Reference’.
6. The digital operator must not be in LOCAL mode.
Parameter Code Display Function Range Initial
Value Access
Level
C3-10 Load Share Lim Load Share enable/disable 0-1 0 Adv