YASKAWA Varispeed f7 User Manual

Using Inverters for Elevating Machines
6-175
If the mechanical operation of the holding brake is slow, use the dwell function at start to prevent brake wear,
and accelerate after the brake is completely open.
Stopping with DC Injection Braking and Zero-speed Control
When the holding brake’s mechanical operation is slow, use DC injection braking
until the brakes are fully closed to prevent the brakes from slipping when stopping.
Torque Compensation (Flux Vector Control Only) (SPEC: E or Later Only)
When flux vector control is used, the torque compensation signals corresponding to the load can be input from
the multi-function analog input terminals in advance to reduce shock, such as that caused by opening and clos-
ing holding brakes. The load size and motoring/regenerating status must be detected at the machine side in
advance. Check that polarity is correct. Incorrect polarity will increase the shock.
IMPORTANT
1. When using open-loop vector control and V/f control, set b6-01 (Dwell frequency at start) higher than fre-
quency detection 2 (frequency when brakes open).
2. If the motor tends to have insufficient torque when started, use the DC injection braking function to allow
sufficient motor current (torque) before starting.
• b2-03 (DC injection braking time at start): 0.2 to 0.5 s
• b2-02 (DC injection braking current): 50% to 80% (open-loop vector control, V/f control only)
IMPORTANT
1. When the load cannot be maintained sufficiently using DC injection braking with open-loop vector control
and V/f control, use the dwell functions at stop.
• b6-03 (Dwell frequency at stop): Min. output frequency to 3.0 Hz.
The value must be less than the frequency when frequency detection 2 is OFF (L4-01 − L4-02).
• b6-04 (Dwell time at stop): 0.3 to 0.5 s
[b2-04 (DC injection braking at stop): 0.0 s]
2. If the Inverter and motor must be isolated while stopping using a magnetic contactor, for example in an ele-
vator, fully close the holding brakes and isolate the Inverter during baseblock (during baseblock signal: ON)
as stipulated by law in the EU.
During motor control or DC injection braking (zero-speed control), an Inverter error may occur due to surge
voltage. When a magnetic contactor is used between the Inverter and motor, set L8-07 (Output open-
phase protection) to 1 (enabled).
b2-04 (DC injection braking time at stop
(zero-speed control time at stop): 0.3 to 0.5 s
(HIGH)
t
Output frequency
Holding brake operation
ON OFF
CLOSE
OPEN
(LOW)
b2-01 [Zero speed level (DC injection braking
starting frequency)]: 0.1 to 3.0 Hz
b2-02 (DC injection braking current): 50% to 80%
(open-loop vector control, V/f control only)
Frequency
detection 2 or
During run 2
(zero-speed control for flux
vector control)

YASKAWA Varispeed f7 Specifications

General

Brand	YASKAWA
Model	Varispeed f7
Category	Inverter
Language	English