![background image](http://html1.mh-extra.com/html/magnetek/impulse-g-series-4/impulse-g-series-4_instruction-manual_3660463124.webp)
IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
5-38
If the stored value is less than the programmed value in C08-03 (Minimum Brake Release torque),
C08-03 is used as the next brake release value. If the feature must be disabled, C08-03 will override
C08-16 if it is a greater value.
Dual Brake Feature
The Dual Brake feature is designed for hoist systems with redundant holding brakes. One brake is
controlled by an MFDO programmed to 00, and the second brake is controlled by an MFDO
programmed to 0A. After a Load Float, during the BE6 (Brake Test) time, one brake is left Open,
while the drive tests that the Closed brake is capable of holding the load. After the BE6 time expires,
the second brake is closed.
This feature is only intended as a method to test each brake individually. A mechanical delay system
may be required to prevent both brakes from closing simultaneously if power is lost.
NOTE: All brake faults are annunciated by both the keypad and via a programmed digital
output. Since the keypad is not visible by the operator, an external warning device must be
used to ensure proper safety of personnel and equipment. Annunciating a brake fault can be
accomplished by using one, or both, of the following methods: 1) An indicator or strobe light
that is continuously “ON”, indicating proper operation. If the light should turn “OFF”, this
indicates that the light bulb has either burned out, or there is a drive or brake problem. Either
scenario requires immediate corrective action. 2) The use of an indicating light wired to relay
output terminals MC-MA, N.O. contact, or an audible warning device that will sound during a
brake fault condition. A 120 VAC audible warning device can be wired directly to terminals
MC-MA, provided that its ratings do not exceed the 1 Amp, 120 VAC, Inductive Spec.
If a brake fault is annunciated during a “Start” sequence, it is recommended that the crane be
moved to a safe location with the load on the hook. The hoist should only be operated if
absolutely necessary. In this type of alarm sequence, either the brake is seized or the drive
cannot develop enough torque in the motor in the time allotted. To troubleshoot the hoist, it
will be necessary to monitor the keypad on the drive and operate the hoist at the same time.
Two people are recommended for this procedure. With one person operating the hoist and
the other person monitoring the keypad, run the hoist. The keypad should display one of the
following faults: BE1, BE2, BE3, or BE4. For corrective action, refer to “Troubleshooting the
Drive” in Chapter 6 of this manual.
If a brake fault is annunciated after the hoist has come to a complete stop, and Load Float
(C08-10) has timed out, it would indicate that the drive has checked the brake and determined
that the brake has insufficient torque available to hold the load. DO NOT TURN OFF POWER.
This condition indicates that the brake has failed and the drive / motor combination is
suspending the load. If, during this condition, the hoist is operated in the “Raise” direction, it
will only be allowed to run at a speed equal to or less than the “BE6 Up Speed” setting in
parameter C08-18 (C08-18 is 6 Hz by default.) This is an additional indication that the brake
has failed to open, or the load is slipping through the brake. It is recommended that the crane
be moved to a safe location and the load lowered to the ground. Corrective action should be
taken to repair the brake. The keypad will be displaying one of two alarms during this
condition: BE5 or BE6. Refer to “Troubleshooting the Drive” in Chapter 6 of this manual.
WA R N I N G
DO NOT turn off power to the drive during a BE6 or BE8 alarm. This may result in loss of
control of the load if the brake has failed in the open position or is unable to hold the load.
Summary of Contents for Impulse G+ series 4
Page 2: ......
Page 6: ...IMPULSE G VG Series 4 Instruction Manual February 2017 iv This page intentionally left blank...
Page 12: ...IMPULSE G VG Series 4 Instruction Manual February 2017 This page intentionally left blank...
Page 13: ...C h a p t e r 1 Introduction...
Page 14: ...IMPULSE G VG Series 4 Instruction Manual February 2017 1 2 This page intentionally left blank...
Page 26: ...IMPULSE G VG Series 4 Instruction Manual February 2017 1 14 This page intentionally left blank...
Page 27: ...C h a p t e r 2 Installation...
Page 28: ...IMPULSE G VG Series 4 Instruction Manual February 2017 2 2 This page intentionally left blank...
Page 40: ...IMPULSE G VG Series 4 Instruction Manual February 2017 2 14 This page intentionally left blank...
Page 41: ...C h a p t e r 3 Wiring...
Page 42: ...IMPULSE G VG Series 4 Instruction Manual February 2017 3 2 This page intentionally left blank...
Page 66: ...IMPULSE G VG Series 4 Instruction Manual February 2017 3 26 This page intentionally left blank...
Page 67: ...C h a p t e r 4 Getting Started...
Page 68: ...IMPULSE G VG Series 4 Instruction Manual February 2017 4 2 This page intentionally left blank...
Page 87: ...C h a p t e r 5 Programming Advanced Features...
Page 88: ...IMPULSE G VG Series 4 Instruction Manual February 2017 5 2 This page intentionally left blank...
Page 223: ...C h a p t e r 6 Troubleshooting...
Page 224: ...IMPULSE G VG Series 4 Instruction Manual February 2017 6 2 This page intentionally left blank...
Page 255: ...a p p e n d i x A IMPULSE G VG Series 4 Parameter Listing...
Page 256: ...IMPULSE G VG Series 4 Instruction Manual February 2017 A 2 This page intentionally left blank...