Lenze IE2 g500-H User Manual

Brakes
The motors can be ordered with a spring-applied brake to allow stopping or deceleraon of
the moving masses. The spring-applied brake operates according to the closed-circuit
principle. In the deenergized state, the brake is closed, prevenng possible movement of the
motor sha or the load aer switching o or in the event of a power failure.
CAUTION!
The brake may not be used as a safety element (parcularly with hoist axes) without
addional measures being implemented.
The brakes used are not fail-safe brakes in the sense that prospecve disrupve factors, e.g.
oil ingress, can lead to a reducon in torque! The fricon surfaces must always be free from oil
and grease because even small amounts of grease or oil will considerably reduce the braking
torque.
Brake connecon
If the installaon is already supplied with DC voltage, a direct connecon without recer is
possible. High inducon peaks may occur and a freewheeling diode or a spark suppressor
should be provided.
A recer is required if the brake is connected to the mains. This is included in the scope of
supply and is located in the motor’s terminal box.
Recer
The recer converts the connecon’s AC voltage into a DC voltage.
Alternavely, a half-wave bridge recer can be used for the applicaon brake. This provides
twice the voltage for a very short me (300 ms). As a result, the features of the brake –
depending on the assignment of the brake’s coil voltage and supply voltage – can be opmized
in the form of a short-term overexcitaon of the brake coil or a reducon of the holding
current.
AC or DC voltage switching
Brakes can be switched both before the recer (AC voltage switching) as well as aer the
recer (DC voltage switching). The choice of control system inuences the engagement me
of the armature plate, inter alia.
AC switching increases the engagement me by a factor of 5 to 10 compared to DC switching.
This is to be observed taken into account when choosing the control system. DC switching is
possible by simply removing a bridge and using the switching contact connecon. However,
this calls for two addional cores in the control cabinet.
DC switching is parcularly expedient for liing applicaons because a short engagement me
is necessary here to guarantee a secure hold without any prior slipping of the load.
Motor supply cables
If long motor supply cables are used, pay aenon to the ohmic voltage drop along the cable
and compensate for it with a higher voltage at the input end of the cable.
The following applies to Lenze system cables:
= + ´ ´
´
B Lg B
[V]
U[V] U [V] 0.08 l [m] I [A]
[A] [m]
U V Resulng supply voltage
U
B
V Rated voltage of the brake
l
Lg
m Cable length
I
B
A Rated current of the brake
Product extensions
Brakes
140

Lenze IE2 g500-H Specifications

General

Brand	Lenze
Model	IE2 g500-H
Category	Industrial Equipment
Language	English