Control Techniques Mentor MP User Manual

Menu 11
Parameter
structure
Keypad and
display
Parameter x.00
Parameter description
format
Advanced parameter
descriptions
Serial comms
protocol
Performance
158 Mentor MP Advanced User Guide
www.controltechniques.com Issue Number: 4
Assuming that the full power discharge time is much shorter than the full power discharge period (which is normally the case) the values for Pr 11.60
and Pr 11.61 can be calculated as follows:
Full power discharge time (Pr 11.62)
Where Energy is the total energy that can be absorbed by the external resistor when its initial temperature is ambient temperature.
⇒
If the cycle shown in the diagram above is followed repeatedly, where the external resistor is heated to its maximum temperature and then cools to
ambient:
The average power in the resistor
where Tp is the full power discharge period (Pr 11.63)
⇒
⇒
⇒
The temperature of the external resistor is monitored by the temperature accumulators (Pr 11.63). When parameter Pr 11.62 reaches 100 % the drive
will trip ‘O.ht3’.
This parameter defines the external resistance installed to the drive by the user. This parameter is used in calculating the power dissipated and
modelling the temperature of the resistor.
If this is not entered correctly the power dissipated, and therefore the thermal protection model for the resistor will be incorrect. This could lead to the
resistor being operated beyond its thermal limits.
11.64 External discharge resistance
Coding
BitSPFIDETEVMDPNDRANCNVPTUSRWBUPS
111
Range 0 to 9999 Ω
Default 0
Update rate Background read
0
100
%
t
Pr
11.62
External
resistor
temperature
Pr
11.65
Pr 11.63
Power
SuppressorVolts()
2
Pr11.64
---------------------------------------------------------------=
T
on
Energy
Power
----------------------=
Disch eTime Pr11.62()Targ
on
Energy
Pr 11.64
SuppesorVolts
----------------------------
×=
P
average
Disch ePowerarg
T
on
T
p
---------
× Disch ePowerarg
Pr 11.62
Pr 11.63
---------------
×==
Disch ePowerarg
Energy
T
on
Pr11.62
-------------------------------------=
AveragePower
Energy
T
p
Pr11.63()
-----------------------------------=
Disch ePower Pr11.63 T
p
arg
Energy
AveragePower
----------------------------------------------=
NOTE

Control Techniques Mentor MP Specifications

General

Brand	Control Techniques
Model	Mentor MP
Category	DC Drives
Language	English