YASKAWA E1000 User Manual

5.2 b: Application
138 YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
OLV/PM (A1-02 = 5)
For these control modes, parameter b2-01 sets the starting frequency for Short-Circuit Braking at stop. Once the output
frequency falls below the setting of b2-01, Short-Circuit Braking is enabled for the time set in parameter b2-13. If DC
Injection Braking time is enabled at stop, then DC Injection Braking is performed for the time set in b2-04 after Short-
Circuit Braking is complete.
Figure 5.9
Figure 5.9 Short-Circuit Braking at Stop in OLV/PM
Note: If b2-01 is set to a smaller value than parameter E1-09 (minimum frequency), then DC Injection Braking will begin as soon as
the frequency falls to the value set to E1-09.
■ b2-02: DC Injection Braking Current
Sets the DC Injection Braking Current as a percentage of the drive rated current. If set larger than 50%, the carrier
frequency is automatically reduced to 1 kHz.
A DC current can be circulated within the motor windings while the motor is stopped. The current will produce heat
within the motor and prevent condensation. b2-02 determines the percentage of drive rated output current that will be
used for the motor pre-heat function. This function can be useful in applications where the motor sits for extended
periods of time in humid conditions. Motor pre-heating can only be initiated by closing a digital input programmed as a
Motor Pre-Heat 1 (H1- = 60). Check with the motor manufacturer to determine the maximum acceptable current
level the motor can withstand when stopped. Be sure not to exceed the motor manufacturers recommended level.
■
b2-03: DC Injection Braking Time at Start
Sets the time of DC Injection Braking at start. Used to stop a coasting motor before restarting it or to apply braking
torque at start. Disabled when set to 0.00 s.
Note: Before starting an uncontrolled rotating motor (e.g., a fan motor driven by windmill effect), DC Injection or Speed Search should
be used to either stop the motor or detect its speed before starting it. Otherwise motor stalling and other faults can occur.
■ b2-04: DC Injection Braking Time at Stop
This parameter sets the DC Injection Braking time at stop. Used to completely stop a motor with high inertia load after
ramp down. Increase the value if the motor still coasts by inertia after it should have stopped. Disabled when set to 0.00 s.
■
b2-09: Motor Pre-Heat Current 2
b2-09 determines the percentage of motor rated output current that will be used for the motor pre-heat function. This
function can be useful in applications where the motor sits for extended periods of time in humid conditions. Motor pre-
heating can only be initiated by closing a digital input programmed as a Motor Pre-Heat 2 (H1- = 50).
No. Name Setting Range Default
b2-02 DC Injection Braking Current 0 to 100% 50%
No. Name Setting Range Default
b2-03 DC Injection Braking Time at Start 0.00 to 10.00 s 0.00 s
No. Name Setting Range Default
b2-04 DC Injection Braking Time at Stop 0.00 to 10.00 s Determined by A1-02
No. Name Setting Range Default
b2-09 Motor Pre-Heat Current 2 0 to 100% 5
Output
frequency
Time
DC Injection
Braking
b2-04b2-13
Short Circuit
Braking
E1-09 Min. Frequency
b2-01 Zero Speed Level
SIEP_C710616_35.book 138 ページ ２０１５年１１月３０日 月曜日 午後２時２分

YASKAWA E1000 Specifications

General

Brand	YASKAWA
Model	E1000
Category	Controller
Language	English