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ISOLGUARD HIG93, HIG93/L, HIG94
V5.8/23
HAKEL spol. s r.o. Hradec Králové
www.hakel.com
Page 3 / 15
1. ISOLGUARD Insulation monitoring devices HIG93, HIG93/L, HIG94
The insulation monitoring devices HIG93, HIG93/L, HIG94 produced by HAKEL for the ISOLGUARD series are designed for
monitoring the insulation status of single-phase and 3-phase ungrounded IT power supply systems that are designed and
operated according to standards IEC 61557-1:2007, IEC 61557-8:2014, HD 60364-4-41:2017.
Devices enable monitoring of single-phase and 3-phase ungrounded IT power supplies systems up to the maximum operating
voltage 275V AC, eventually 3x275V AC. If insulation status monitoring of a single-phase or 3-phase ungrounded IT power
supply system with higher operating voltage is required, it is necessary to create an artificial centre using TL inductors produced
by HAKEL. Such a created centre is connected to the terminal of insulation monitoring device HIG93, HIG93/L or HIG94.
Insulation monitoring devices enable to display the numeric value of the measured insulation resistance, then there are buttons
for setting device parameters and signalling LED diodes to display the status of monitored power supply system and of the
device. To the insulation monitoring device, it is possible to connect MDS-D series remote monitoring modules to monitor the
power supply system status, which are produced by HAKEL.
HIG93, HIG93/L and HIG94 devices are equipped with ISOLGUARD RS485 communication line and can communicate with
a master computer via industrial RS485 bus with the protocol based on the PROFIBUS protocol. Description of the
communication protocol is available on request.
Two inbuilt signalling relays with switching contacts enables alarm signalling for two independently set values of critical
insulation resistance. The insulation monitoring device has an optional alarm memory function with the possibility to terminate
the alarm using the button on the device. Local and remote testing of the insulation monitoring device function can be done.
Only one insulation monitoring device can be connected to the same ungrounded IT power supply
system.
1.1
Variants of devices ISOLGUARD HIG93, HIG93/L, HIG94
Type
Display
Menu
Signalling
relay 1
Signalling
relay 2
Range of
displayed
value
Critical insulation
resistance
Communication
bus bar
MDS-D
connection
Device type
according to
IEC 61557-8
SW
HIG93
Yes
1x SPDT 1x SPDT
5
kΩ to 900
kΩ
Adjustable
5 kΩ to 300 kΩ
RS485
ISOLGUARD
Yes
V5.8
Art. no.
70 915
HIG93/L
0,1 kΩ to
90 kΩ
Adjustable
0,1 kΩ to 90 kΩ
Art. no.
70 915/L
HIG94
200
kΩ to
5
MΩ
Adjustable
200 kΩ to 900
kΩ
Art. no.
70 917
Table 1: Variants of devices
Notes: SPDT signalling relay with one switching contact
MDS-D remote monitoring module of HIG series devices, with display and communication via ISOLGUARD RS485 line
HIG93, HIG93/L, HIG94 complies with standards
:
HD 60364-4-41:2017
Low-voltage electrical installations- Protection against electric shock
IEC 61557-8:2014
Insulation monitoring devices for IT systems
IEC 61557-1:2007
Equipment for testing, measuring or monitoring of protective measures
IEC 60664-1:2007
Insulation coordination for equipment within low-voltage system - Principles, requirements and tests
1.2
Basic characteristics
Insulation monitoring device of AC systems with 0 to 275 V voltage without additional devices, for greater voltages
additional inductor is needed
Display of the measured insulation resistance
R
isol
in the range 0,1 kΩ to 90 kΩ, 5 kΩ to 900 kΩ or 200 kΩ to 5 MΩ
Two insulation resistance status signalling relays equipped with switching contact
Connection to ISOLGUARD RS485 bus, insulation strength 2500 V
rms
against the internal circuits and network circuits
Optional memory of the invoked alarm with possibility to unlock by button on the device
Option to set two values of monitored insulation resistance
R
crit1
and
R
crit2
using the display and push-buttons, namely in
the range 0,1 kΩ to 90 kΩ, 5 kΩ to 300 kΩ or 200 kΩ to 900 kΩ according to the device type
Adjustable hysteresis of the insulation resistance limit value in the range 0 to 100 % using the display and push-buttons
Adjustable delay in signalling relay response t
ON
in the range 0 to 60 seconds using the display and push-buttons
Access to the device settings with the pushbuttons can be locked. Unlock by a button combination.
Separate supply voltage also allows to monitor IT power supply system, which is not under voltage
2M (36 mm) module width for assembling on DIN rail 35
ed. 28.7.2020
AC