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8.3.1
Motor thermal sensor
For motors where the thermal sensor output is on the resolver connector, the thermal switch is connected
to the X1 connector (terminals 1 and 2). On motors where the thermal switch output is on the power
connector, the thermal switch can be connected via the back of the rack ..
On motors with an NTC thermal sensor, the amplifier configuration is the following: OP jumper closed
and MN jumper open.
On motors with a PTC thermal sensor, the amplifier configuration is the following: MN jumper closed and
OP jumper open.
The threshold adjustment for the NTC thermal probes is made by means of the PSTH components, as
described below:
PSTH-D = 14,3 k
Ω
/ PSTH-B = 28 k
Ω
PSTH-A = 3 x RNTC (120°C) en k
Ω
.
RNTC (120°C): ohmic value of the NTC thermal probe resistor at 120°C.
Example: BLS74 motor
RNTC (120°C) = 3 k
Ω
PSTH-A = 10 k
Ω
, PSTH-B = 28 k
Ω
, PSTH-D = 14,3 k
Ω
.
8.3.2
Current loops
The adjustment of the current loop P.I. regulators according to the amplifier current and to the inductance
between the motor terminals is made as follows:
4A, 8A, 12A AND 17A AMPLIFIERS
Calculation of G = 1.4 x Amplifier current (A) x Inductance between phases (mH),
•
If G < 60, current loop jumpers on B3 position,
•
If 60 < G < 100, current loop jumpers on B2 position,
•
If G > 100, current loop jumpers on B1 position.
30A, 45A AND 60A AMPLIFIERS
Calculation of G = 1.4 x Amplifier current (A) x Inductance between phases (mH),
•
If G < 100, current loop jumpers on B3 position,
•
If 100 < G < 250, current loop jumpers on B2 position,
•
If G > 250, current loop jumpers on B1 position.
70A AND 100A AMPLIFIERS
Calculation of G = 1.4 x Amplifier current (A) x Inductance between phases (mH),
Calculation of the RA, CA and C14 components of the current loops,
RA = G (K
Ω
), CA = 130 /G (nF), C14 = CA /G (nF).
