IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 106
5.2.17 Emergency Lift (VG+)
The Emergency Lift (E-Lift) function can be utilized to operate the VFD in the event of an encoder related fault
(PGO-1-S/PGO-1-H) that resulted from a defective encoder, encoder cable, or PG-X3 option card. E-Lift can be
enabled with a Multi-Function Digital Input (H01-01 ~ H01-08 = 44) under the condition that all run commands have
been removed and the VFD is not outputting voltage.
When E-Lift is active, the VFD will switch to the control method set in E03-01. In hoist applications, it is highly
recommended to leave E03-01 set to OLV, which will ensure proper control of the load. Furthermore, all functions
that depend on encoder feedback will be disabled. The Test Mode Configuration parameters (E03-xx group) are
active during E-Lift operation instead of the E01-xx parameters. By default, the E-Lift function may only remain
operational for 10 minutes (user-adjustable by C08-37), after which a fault will be generated.
5.2.17.1 Emergency Lift Setup Instructions
1. Auto-Tune the motor:
Complete the Standard Tuning (Rotational Auto-Tuning) for the motor described in Section 4.4 on page 64.
2. Configure the E03 Parameter Group - Test Mode Configuration:
When E-Lift is active, the Test Mode parameters are utilized for voltage and frequency limits instead of the E01
group. The E03 group should be configured as described Table 5-61 on page 136.
3. Configure the E-Lift Parameters:
The parameters listed in Table 5-33 are used to configure the E-Lift function.
Table 5-33: E-Lift Parameters
Parameter Display Function Range Default
C08-35 Emergency Lift Determines whether the E-Lift MFDI function
is enabled.
0, 2 0
0 Disabled
1 Enabled by MFDI
C08-36 ELift Max Speed Maximum frequency reference when E-Lift is
active.
0–150 Hz 30
C08-37 ELift Max Time Maximum time that E-Lift can be active. 0–6000 s 600
DANGER
E-Lift is designed to allow for temporary hoisting operations of motors normally equipped with an encoder in
Flux Vector control. Always follow instructions given in the E-Lift setup guide, and utilize extreme caution when
operating a hoist in E-Lift mode. Stop the hoist if any undesired motion occurs and contact Magnetek for
additional assistance.
DANGER
Do NOT set E03-01 to a value of 0 (V/f Control) when using E-Lift in hoist applications. E-Lift is designed to
operate using the Open Loop Vector (OLV) control method. The use of the V/f control method may cause
undesired motion of the load and is only intended for troubleshooting Flux Vector control method related problems.
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