nord NORDAC PRO SK 511E Series - Page 98

SK 54xE – Users Manual for Frequency Inverters
98 BU 0505 EN-3021
P107
Brake reaction time
(Brake reaction time)
P
0 ... 2.50 s
{ 0.00 }
Electromagnetic brakes have a physically-
dependent delayed reaction time when actuated. This
can cause a dropping of the load for lifting applications, as the brake only takes over the load after
a delay.
The reaction time must be taken into consideration by setting parameter P107.
Within the adjustable application time, the FI supplies the set absolute minimum frequency (P505)
and so prevents movement against the brake and load drop when stopping.
If a time > 0 is set in P107 or P114, at the moment the FI is switched on, the level of the excitation
current (field current) is checked. If no magnetising cu
rrent is present, the FI remains in
magnetising mode and the motor brake is not released.
In order to achieve a shut-down and an error message (E016) in this case, P539 must be set to 2
or 3.
See also the parameter >Release time< P114
Pos: 136 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P100- P199/Parameter P107 – Ei nfallzeit Bremse_Inf o Ansteuerung durch FU [SK 5 xxE] @ 4\mod_1396520689350_3 88.docx @ 123926 @ @ 1
Information
Brake control
For the control of electromagnetic braking (especially for lifting equipment) an internal relay
should be used, (Function 1, external brake (P434/441). The minimum absolute frequency
(P505) should never be less than 2.0 Hz.
Pos: 137 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P100- P199/Parameter P107 – Ei nfallzeit Bremse_Beispi el @ 4\mod_1396519433556 _388.docx @ 123851 @ @ 1
Recommendation for applications:
Lifting equipment with brake, without speed feedback Lifting equipment with brake
P114 = 0.02...0.4 s *
P107 = 0.02...0.4 s *
P201…P208 = Motor data
P434 = 1 (ext. brake)
P505 = 2...4 Hz
for safe start-up
P112 = 401 (off)
P536 = 2.1 (off)
P537 = 150 %
P539 = 2/3 (I
SD
monitoring)
to prevent load drops
P214 = 50...100 % (precontrol)
* Settings (P107/114) depending on
brake type and motor size. At low power
levels (< 1.5
kW) lower values apply for
higher power ratings (> 4.0
kW) are
larger values.
Output
frequency
P107
Brake released
P114
or
P107, when P114 = 0
ON signal
P505
OFF signal
Time
Pos: 138 /Anleitun gen/Elektronik/F U und Starter/5. Parameter /Parameterauflis tung (P000 ...)/ P100-P199/Parameter P108 – Aussc haltmodus @ 0\mod_1327575 421965_388.doc x @ 7665 @ @ 1