36
6.1.2 Stopping Sequence
In order to prevent slipping when the drive is stopped, enough torque must be produced to take care of the load until the
brake is completely clamped shut.
Operation Description
(1) If a Stop Command is input (i.e., both the FWD and REV commands are open), then the drive will stop by the
method set to parameter b1-03. Deceleration will occur at the set decel time until the Slip Prevention Frequency
(HF) is reached. In Flux Vector Mode, however, the drive will instead decelerate to zero speed.
(2) If the output frequency (SFS Output) falls below the Brake Release Frequency (FHF, or HR when in reverse), then
the Brake Release Command will open, and the Brake Release Answer back (BX) will also open on account of
external circuitry.
(3) The drive will stop after deceleration hold (Slip Prevention Time) at the Slip Frequency (HF).
In Flux Vector Mode, however, the drive will execute zero speed control during stop timer counting..
Note-1: If the output frequency (SFS Output) falls below the Brake Release Frequency (FRF, FRR) when the
conditions (ST) described below have been met, then the Brake Release command relay will open.
・
Both the Forward Command and Reverse Command terminals are open
・
During FWD/REV switching
Note-2: Without entering a Stop Command (either the FWD or REV command relays are closed), the drive will continue
running at the larger value found in either the Brake Release Frequency from the frequency reference (FRF, FRR),
or simply the Brake Release Frequency (FHF, FHR). If the signal level for terminal A1 (H3-01) is set to "1", the
stopping sequence is executed when the frequency reference falls below Zero Speed (b2-01), or if the minimum
output frequency (set in E1-09) continues for more than 100ms. Here, if an output frequency reference of less than
the value set to E1-09 is input, then output voltage will be interrupted (Baseblock).
6.1.3 Forward / Reverse Switch
In flux vector mode, the sequence of operations cannot go from forward to reverse without the brake, and then switch
directions from reverse back to forward again (Zero Speed Cross) except flux vector mode. When a Run Command is
entered from the reverse side while the drive is running, then the drive will follow operations discussed in 6.1.2, "Stop
Sequence". After the brake has completely clamped shut, drive operations will begin on the revers e-side as shown in
section 6.1.1, "Sequence at Start".
In flux vector mode, the drive will operate by going from forward to reverse and from reverse to forward continuously
(Zero Speed Cross). There are also times when the brake will still clamp down. See section 6.2.1, "Run Command
Minimum ON Time”, for a more detailed description.
Lastly, the brake will be applied if the frequency reference is set lower than the Brake Release Frequency (FRF, or FRR
in reverse) when performing FWD/REV switching.
Summary of Contents for CIMR-F7Z
Page 3: ......
