Led Display; Grounding System; Dynamic Braking (Brake Circuit) - Kollmorgen S700 Series Instruction Manual

7.4 LED display

A 3-character
supply (➜ # 121). When the keys on the front panel are used, the parameter and function
numbers are shown, as well as the numbers for any errors and warnings that may occur (➜ #
123).

7.5 Grounding system

AGND
DGND - 24V-IO, digital inputs and digital outputs, optically isolated.
GND
XGND
BRGND - 24V motor brake supply

7.6 Dynamic braking (brake circuit)

During braking with the aid of the motor, energy is fed back into the servo amplifier. This gen-
erated energy is dissipated as heat in the brake resistor. The brake resistor is switched in by
the brake circuit. The setup software can be used to adapt the brake circuit (thresholds)
according to the electrical supply voltage. Our customer service can help you with the cal-
culation of the brake power that is necessary for your system. A
in the "KDN". A description of the interface can be found on page (➜ # 71).
Functional description:
1.- Individual amplifiers, not coupled through the DC bus link circuit (DC+, DC-)
When the energy fed back from the motor has an average or peak power that exceeds the pre-
set level for the brake power rating, then the servo amplifier generates the warning "n02 brake
power exceeded" and the brake circuit is switched off. The next internal check of the DC bus
link voltage (after a few milliseconds) detects an overvoltage and the output stage is
switched off, showing the error message "Overvoltage F02" (➜ # 123).
The BTB/RTO contact (terminals X3B/14,15) will be opened at the same time (➜ # 102).
2.- Several servo amplifiers coupled through the DC bus link (DC+, DC-)
Using the built-in brake circuit, several amplifiers of the same series can be operated off a
common DC bus link (observe (➜ # 70)), without requiring any additional measures. 90% of
the combined power of all amplifiers is always available for peak and continuous power.
The switch-off on overvoltage takes place as described under 1. (above) for the amplifier that
has the lowest switch-off threshold (resulting from tolerances).
Technical data of the brake circuits depend on the amplifiers type and the mains voltage situ-
ation (VBUSBAL).
Technical Data
Rated data
Switch-on threshold of brake circuit
Overvoltage F02
Pulse brake power
External brake resistor (RBe), S748
External brake resistor (RBe), S772
Continuous brake power (RBe)
* Kollmorgen recommends setting VBUSBAL=4 in case of 480 V mains supply, with this set-
ting the optimized calculation method is used.
Suitable external brake resistors can be found in our accessories manual.
LED-Display indicates the status of the amplifier after switching on the 24 V
- analog inputs, internal analog ground
- internal digital ground, encoder Emulation, RS232, CAN
- 24V supply, STO Enable, ventilator
S748-772 Instructions Manual | 7 Technical description
VBUSBAL: Supply voltage
DIM 1:230 V 2:400 V
V 400 720
V 455 800
kW 16
Ohm
Ohm
kW
Kollmorgen | kdn.kollmorgen.com | July 2019
simple method is described
3:480 V 4*:480 V
840 790
900 900
50 70 70
15
10
8
35