44
• DOK-POWER*-TVD*1.3****-ANW1-EN-E1,44 • 02.97
5.
Terminal Descriptions
5.1. DC bus short-circuiting
Terminal X2/1 - X2/2
Voltage: 24 V DC
Current consumption: 270 mA
Input
open
closed
Power off,
Power on,
Operating status
DC bus
DC bus
short-circuit
short-circuit
closed
open
The TVD main power contactor can be pulled in only if the ZKS input is closed.
The DC bus is short-circuited if the ZKS input is open. This is an additional
safety feature for the machine for braking drives to a standstill with a fault in
drive electronics.
Maximum of 25 operating cycles per minute (w/o additional capacitance with
drive standing)
5. Terminal Descriptions
Input ZKS
5.2. Power off
Terminal X2/3 - X2/4
Voltage: 24 V DC
Current consumption: 270 mA
Input
open
closed
Operating status
Power off
Power on
The main power contactor in the TVD can be pulled in only if the OFF input is
closed. If the OFF input is open, for example during an E-stop, then the main
power contactor in the TVD opens immediately.
5.3. Power on
Terminal X2/5 - X2/6
Voltage: 24 V DC
Current consumption: 270 mA
Input
open
closed or open and
closed when latched
Operating status
Power off
Power on
If ZKS and OFF inputs are closed and the internal drive-ready signal is
present, closing the ON input will cause the TVD main contactor to pull in.
Next, the main contactor is latched on. The ON signal is a pulse and must hold
high for at least 200 ms.
Switching rate:
max. 25 operating cycles per minute
Service life:
2.5 million operating cycles
Input OFF
Input ON
C
ZU
= DC bus capacitance in F
J
g
= Total moment of inertia of mass in kgm
2
P
ZK
= Power of the ZK resistor in W
220W with TVD 1.3-08
440W with TVD 1.3-15
ω
= Angular speed in rad / s
Z
= Switching rate per minute but max. 25 / min.
Fig. 5.1:Switching rate with additional capacitance and rotating motor
2 • P
ZK
C
zu
• 425
2
+ J
g
•
ω
2
Z
=
• 60
Switching rate
