P19 DC Brake Level CFN 18
LED Display LCD Display
Range 10 – 100 % of available brake torque (Default 25%)
Description When the Stop Mode (P15 / CFN 14) is set to DC brake, the DC Brake Level parameter sets the level of DC
current applied to the motor during braking. The desired brake level is determined by the combination of the
system inertia, system friction, and the desired braking time. If the motor is braking too fast the level should
be reduced. If the motor is not braking fast enough the level should be increased. Refer to Nema MG1, Parts
12 and 20 for maximum load inertia. A Thermistor, Thermostat or RTD MUST be installed to protect the
motor.
DC Brake Function Programming Steps:
1. The DC Brake function may be enabled by setting the stop mode (P15 / CFN 14) to DC Brake.
2. Once this function is enabled, a relay output configuration (P52,53,54 / I/O 05,06,07) must be
used to control the DC brake contactor or 7th SCR gate drive card during braking. It is
recommended to use Relay K3 - (P54 / I/O 07).
z NOTE: Standard braking
- For load inertia less than 6 x motor inertia
z NOTE: Heavy duty braking
- For NEMA MG1 parts 12 and 20 maximum load inertia
z NOTE: When DC injection braking is utilized, discretion must be used when setting up the DC Brake
Level. Motor heating during DC braking is similar to motor heating during starting. Even though the Motor
OL is active (if not set to "Off") during DC injection braking, excessive motor heating could still result if the
load inertia is large or the brake level is set too high. Caution must be used to assure that the motor has the
thermal capacity to handle braking the desired load in the desired period of time without excessive heating.
z NOTE: Consult motor manufacturer for high inertia applications.
z NOTE: Not to be used as an emergency stop. When motor braking is required even during a power outage
an Electro mechanical brake must be used.
See Also Stop Mode (P15 / CFN 14) parameter on page 87.
DC Brake Time (P20 / CFN 19) parameter on page 92.
DC Brake Delay (P21 / CFN 20) parameter on page 93.
Controlled Fault Stop Enable (P43 / PFN 12) parameter on page 105.
Digital Input (P48-50 / I/O 01-03) parameters on page 110.
Theory of Operation section 7.1, Solid State Motor Overload Protection, on page 132.
Theory of Operation section 7.5.9, DC Injection Braking Control, on page 156.
91
6 - PARAMETER DESCRIPTION
CFN: Brake Level
18 25 %
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