Application Notes
13-3
631 Digital Servo Drive 07-01-08-02-E-V0500
STEP 2: To determine if a brake resistor is required
Example
Calculation
Drive model 631/004 selected
Do you require an external brake-resistor?
Drive Data from Chapter 11
Drive Data from Chapter 11
Drive Data from Chapter 11
Drive Data from Chapter 11
Nominal Power internal: 8W
Maximum Power internal: 352W
From Step 1 calculation
From Step 1 calculation
From Step 1 calculation
From Step 1 calculation
Continuous Power: 9.3W
Maximum Power: 405W
Result: An external braking resisitor is
Result: An external braking resisitor is
Result: An external braking resisitor is
Result: An external braking resisitor is
required in this case.
required in this case.
required in this case.
required in this case.
Refer to the Chapter 9: “Accessories”
In case of insufficient capability of the
internal brake resistor, an external
resistor must be connected.
(Terminals DBR1, DBR2)
IMPORTANT:
Only the approved resistors listed in Chapter 9: “Accessories” must be used with the 631
servo drive.
Derating of Output Voltage
Due to the line-ripple of DC Bus, the rate of usable output voltage is derated as follows.
This deration affects the maximum achievable speed of the applied motor.
Derating of Servo Drive Output Voltage
2
4
6
8
10
20
40
60
80
0
0
12
[%]
Output current (A)
Output voltage (210/230V) in % of unloaded condition
100
Low voltage range, device inactive
1-ph 50 Hz *
631/004.006
1-ph 50Hz *
631/001.002
1-ph 50 Hz *
631/006
Limit for continuous
operation >1 minute
* The specified reductions refer to 50Hz, the most unfavourable operating state.
