C4 User Manual
Page 114 ©2021 Smartrise Engineering, Inc. All Rights Reserved October 25, 2021
Brake Pick Delay – The Brake Pick Delay parameter adds a delay to the brake energizing phase
of the start of run sequence. As the delay time increases, the brakes are deenergized for a
longer period of time to allow time for the motor to energize and gain control of the car. As
time decreases, the brakes energize faster to allow for a faster take off.
If pick delay is too high, the motor can potentially run through the brake. If pick delay is too
low, roll back may potentially occur if the car is not balanced or drive is tuned to handle the
load.
The adjustment range is from: 0 - 65535 ms.
• Default: 100 ms
• Units of Measure: ms
Brake Drop Delay – The Brake Drop Delay parameter controls the amount of time the motor
holds at zero speed prior to deenergizing the primary brake. If the delay is too soon, the brakes
deenergize and car may stop under the brake causing a harsh stop. if the timer is set too long,
the car may roll forward or back. This parameter should remain at 0 for most jobs unless there
is a bit of overshoot in the motor.
The adjustment range is from: 0 - 3000 ms.
• Default: 0 ms
• Units of Measure: ms
Drive Drop Delay – Sets the stop sequence delay between dropping the brake and dropping
drive control (zero speed). Value can be increased if the drive is dropping control too early and
there is still movement after the brake drops. Lowering the value may cause unwanted
movement at the end of the run.
The adjustment range is from: 0 - 3000 ms.
• Default = 500 ms
• Units of Measure: ms
Motor Drop Delay – Sets the stop sequence delay between dropping drive control and
dropping the M contactor. This value should remain unchanged for most jobs. A high value may
cause a delay in the stop sequence, a low value may cause drive faults due to the M contactor
de-energizing while the motor is still energized.
The adjustment range is from: 0 - 65535 ms.
• Default: 0 ms
• Units of Measure: ms
B2 Drop Delay – Sets the stop sequence delay between dropping the secondary brake and
dropping the B2 contactor. Timer set too low may cause the contactor to open under load,
timer set too high will cause a longer stop sequence.
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