background image

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 

Summary of Contents for ISOLGUARD HIG93

Page 1: ...LGUARD HIG93 HIG93 L HIG94 V5 8 23 HAKEL spol s r o Hradec Kr lov www hakel com Page 1 15 Insulation monitoring device ISOLGUARD HIG93 HIG93 L HIG94 Operating instructions Document s name DOK 70915 V5...

Page 2: ...ion 5 Picture 2 Connection of HIG93 94 device 7 Picture 3 Connection of HIG93 94 device 7 Picture 4 Displayed information 8 Picture 5 Insulation resistance fault evaluation 11 Picture 6 Insulation sta...

Page 3: ...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 connec...

Page 4: ...c Outputs Two signalling relays with switching contact electric strength to the internal circuits electric strength to the supply circuits 250 V AC 1 A 3750 Vrms 3750 Vrms Communication line RS485 typ...

Page 5: ...u is shown on the display When the insulation resistance Risol is viewed it activates the parameter setting menu Within the parameters setting menu the prolonged pressing of this push button terminate...

Page 6: ...connections of the insulation monitoring Device Terminals A B SH These terminals are intended for connection of galvanic isolated communication line ISOLGUARD RS485 Individual insulation monitoring de...

Page 7: ...FAULT2 FAULT1 S1 S2 S3 SH B A FAULT2 FAULT1 MENU 1 2 3 4 5 6 PE L1 L1 L2 PE L2 L3 N L3 TL400 L1 L2 L3 CENTRE Rtl ext TEST ALARM 2 ALARM 1 RS485 ISOLGUARD PE 4 Recommended connection of HIG93 HIG93 L...

Page 8: ...C SET Relay Logic ESC SET N C FAULT ESC SET Picture 4 Displayed information 5 Information on the display Operating principles The meaning of the push buttons in each menu is shown on the display Press...

Page 9: ...ation line is performed immediately after receiving the order and takes 5 seconds If the FAULT memory is set Mem FAULT menu the signal relay remains in a status of alarm indication even after the test...

Page 10: ...label as Rin Typical values for three phase HAKEL inductors are as follows TL400 4 5 k TL500 4 5 k TL600 4 5 k TL1600 12 5 k TL6003 19 6 k Exact values may be obtained by measuring the inductor s wind...

Page 11: ...LT2 is only terminated when the insulation resistance increases above the value Rcrit1 Rhyst or Rcrit2 Rhyst Signalling relay is released and FAULT1 FAULT2 signalling is terminated The following left...

Page 12: ...assigned by the MASTER station In practice the communication proceeds in such a way that the MASTER station sends requests subsequently to all connected units and the SLAVE stations response The acces...

Page 13: ...nt data determining the status of this measurement e g fault occurrence Parameter data are extended of priority character determining the importance of the set parameter This character divides paramet...

Page 14: ...20 20 20 Delay in response of signalling the fault Set tON tON 0 sec 0 sec 0 sec External inductor resistance Set TLext Rtl ext 0 k 0 k 0 k Delay in device test start by remote test button Set tTEST t...

Page 15: ...and service It is necessary to follow specified conditions for reliable operation do not expose the device to rough handling keep it clean and ensure maximum admissible temperature of the environment...

Reviews: